Add Lyng string interpolation with docs/tests and refresh changelog

AGENTS.md

@@ -5,6 +5,14 @@
 - For generics-heavy code generation, follow `docs/ai_language_reference.md` section `7.1 Generics Runtime Model and Bounds` and `7.2 Differences vs Java / Kotlin / Scala`.
 - Use `docs/ai_stdlib_reference.md` for default runtime/module APIs and stdlib surface.
 - Treat `LYNG_AI_SPEC.md` and older docs as secondary if they conflict with the two files above.
+- Prefer the shortest clear loop: use `for` for straightforward iteration/ranges; use `while` only when loop state/condition is irregular or changes in ways `for` cannot express cleanly.
+- In Lyng code, slice strings with range indexing (`text[a..<b]`, `text[..<n]`, `text[n..]`) and avoid Java/Kotlin-style `substring(...)`.
+
+## Lyng-First API Declarations
+- Use `.lyng` declarations as the single source of truth for Lyng-facing API docs and types (especially module extern declarations).
+- Prefer defining Lyng entities (enums/classes/type shapes) in `.lyng` files; only define them in Kotlin when there is Kotlin/platform-specific implementation detail that cannot be expressed in Lyng.
+- Avoid hardcoding Lyng API documentation in Kotlin registrars when it can be declared in `.lyng`; Kotlin-side docs should be fallback/bridge only.
+- For mixed pluggable modules (Lyng + Kotlin), embed module `.lyng` sources as generated Kotlin string literals, evaluate them into module scope during registration, then attach Kotlin implementations/bindings.
 
 ## Kotlin/Wasm generation guardrails
 - Avoid creating suspend lambdas for compiler runtime statements. Prefer explicit `object : Statement()` with `override suspend fun execute(...)`.

CHANGELOG.md

@@ -1,156 +1,88 @@
-## 1.5.0-SNAPSHOT
+# Changelog
 
-### Language Features
+This file tracks user-visible Lyng language/runtime/tooling changes.
-- Added `return` statement with local and non-local exit support (`return@label`).
-- Support for `abstract` classes, methods, and variables.
-- Introduced `interface` as a synonym for `abstract class`.
-- Multiple Inheritance (MI) completed and enabled by default (C3 MRO).
-- Class properties with custom accessors (`get`, `set`).
-- Restricted setter visibility (`private set`, `protected set`).
-- Late-initialized `val` fields in classes with `Unset` protection.
-- Named arguments (`name: value`) and named splats (`...Map`).
-- Assign-if-null operator `?=`.
-- Refined `protected` visibility rules and `closed` modifier.
-- Transient attribute `@Transient` for serialization and equality.
-- Unified Delegation model for `val`, `var`, and `fun`.
-- Singleton objects (`object`) and object expressions.
 
-### Standard Library
+History note:
-- Added `with(self, block)` for scoped execution.
+- The project had periods where changelog maintenance lagged behind commits.
-- Added `clamp()` function and extension.
+- Entries below are synchronized and curated for `1.5.x`.
-- Improved `Exception` and `StackTraceEntry` reporting.
+- Earlier history may be incomplete and should be cross-checked with git tags/commits when needed.
 
-### Tooling and IDE
+## 1.5.1 (2026-03-25)
-- **CLI**: Added `fmt` as a first-class subcommand for code formatting.
-- **IDEA Plugin**: Lightweight autocompletion (experimental), improved docs, and Grazie integration.
-- **Highlighters**: Updated TextMate bundle and website highlighters for new syntax.
 
-### Detailed Changes:
+### Language
+- Added string interpolation:
+  - `"$name"` identifier interpolation.
+  - `"${expr}"` expression interpolation.
+- Added literal-dollar forms in strings:
+  - `"\$"` -> `$`
+  - `"$$"` -> `$`
+  - `\\$x` is parsed as backslash + interpolation of `x`.
+- Added per-file interpolation opt-out via leading directive comment:
+  - `// feature: interpolation: off`
 
-- Language: Refined `protected` visibility rules
+### Docs and AI references
-  - Ancestor classes can now access `protected` members of their descendants, provided the ancestor also defines or inherits a member with the same name (indicating an override of a member known to the ancestor).
+- Updated compiler-accurate AI language docs:
-  - This allows patterns where a base class calls a `protected` method that is implemented in a subclass.
+  - interpolation syntax and escaping
-  - Fixed a regression where self-calls to unmangled members sometimes bypassed visibility checks incorrectly; these are now handled by the refined logic.
+  - per-file feature switch behavior
+- Refreshed tutorial examples and doctests to reflect new interpolation semantics.
+- Added/reworked current proposal/reference materials for Lyng common-platform guidance.
 
-- Language: Added `return` statement
+### Compatibility notes
-  - `return [expression]` exits the innermost enclosing callable (function or lambda).
+- Interpolation is enabled by default for normal string literals.
-  - Supports non-local returns using `@label` syntax (e.g., `return@outer 42`).
+- Existing code that intentionally used `$name` as literal text should use `\$name`, `$$name`, or the file directive `// feature: interpolation: off`.
-  - Named functions automatically provide their name as a label for non-local returns.
-  - Labeled lambdas: lambdas can be explicitly labeled using `@label { ... }`.
-  - Restriction: `return` is forbidden in shorthand function definitions (e.g., `fun f(x) = return x` is a syntax error).
-  - Control Flow: `return` and `break` are now protected from being caught by user-defined `try-catch` blocks in Lyng.
-  - Documentation: New `docs/return_statement.md` and updated `tutorial.md`.
 
-- Language: stdlib improvements
+## 1.5.0 (2026-03-22)
-  - Added `with(self, block)` function to `root.lyng` which executes a block with `this` set to the provided object.
-- Language: Abstract Classes and Interfaces
-  - Support for `abstract` modifier on classes, methods, and variables.
-  - Introduced `interface` as a synonym for `abstract class`, supporting full state (constructors, fields, `init` blocks) and implementation by parts via MI.
-  - New `closed` modifier (antonym to `open`) to prevent overriding class members.
-  - Refined `override` logic: mandatory keyword when re-declaring members that exist in the ancestor chain (MRO).
-  - MI Satisfaction: Abstract requirements are automatically satisfied by matching concrete members found later in the C3 MRO chain without requiring explicit proxy methods.
-  - Integration: Updated highlighters (lynglib, lyngweb, IDEA plugin), IDEA completion, and Grazie grammar checking.
-  - Documentation: Updated `docs/OOP.md` with sections on "Abstract Classes and Members", "Interfaces", and "Overriding and Virtual Dispatch".
-- IDEA plugin: Improved natural language support and spellchecking
-  - Disabled the limited built-in English and Technical dictionaries.
-  - Enforced usage of the platform's standard Natural Languages (Grazie) and Spellchecker components.
-  - Integrated `SpellCheckerManager` for word suggestions and validation, respecting users' personal and project dictionaries.
-  - Added project-specific "learned words" support via `Lyng Formatter` settings and quick-fixes.
-  - Enhanced fallback spellchecker for technical terms and Lyng-specific vocabulary.
 
-- Language: Class properties with accessors
+### Major runtime/compiler direction
-  - Support for `val` (read-only) and `var` (read-write) properties in classes.
+- Completed migration to bytecode-first/bytecode-only execution paths.
-  - Syntax: `val name [ : Type ] get() { body }` or `var name [ : Type ] get() { body } set(value) { body }`.
+- Removed interpreter fallback behavior in core execution hot paths.
-  - Laconic Expression Shorthand: `val prop get() = expression` and `var prop get() = read set(v) = write`.
+- Continued frame-slot-first local/capture model improvements and related diagnostics.
-  - Properties are pure accessors and do **not** have automatic backing fields.
-  - Validation: `var` properties must have both accessors; `val` must have only a getter.
-  - Integration: Updated TextMate grammar and IntelliJ plugin (highlighting + keywords).
-  - Documentation: New "Properties" section in `docs/OOP.md`.
 
-- Language: Restricted Setter Visibility
+### Language features and semantics
-  - Support for `private set` and `protected set` modifiers on `var` fields and properties.
+- Added/finished `return` semantics including labeled non-local forms (`return@label`).
-  - Allows members to be publicly readable but only writable from within the declaring class or its subclasses.
+- Added abstract classes/members and `interface` support (as abstract-class-style construct).
-  - Enforcement at runtime: throws `AccessException` on unauthorized writes.
+- Completed and enabled multiple inheritance with C3 MRO by default.
-  - Supported only for declarations in class bodies (fields and properties).
+- Added class properties with accessors (`get`/`set`) and restricted setter visibility (`private set`, `protected set`).
-  - Documentation: New "Restricted Setter Visibility" section in `docs/OOP.md`.
+- Added late-initialized class `val` support with `Unset` protection rules.
+- Added named arguments (`name: value`) and named splats (`...map`) with stricter validation.
+- Added assign-if-null operator `?=`.
+- Improved nullable/type-checking behavior (including `T is nullable` and related type checks).
+- Added variadic function types (`...` in function type declarations) and tighter lambda type checks.
 
-- Language: Late-initialized `val` fields in classes
+### Type system and collections
-  - Support for declaring `val` without an immediate initializer in class bodies.
+- Added immutable collections hierarchy (`ImmutableList`, `ImmutableSet`, `ImmutableMap`).
-  - Compulsory initialization: every late-init `val` must be assigned at least once within the class body or an `init` block.
+- Improved generic runtime binding/checking for explicit type arguments and bounds.
-  - Write-once enforcement: assigning to a `val` is allowed only if its current value is `Unset`.
+- Added smarter type-aware collection ops (`+=`, `-=`) and stronger declared-member type checks.
-  - Access protection: reading a late-init `val` before it is assigned returns the `Unset` singleton; using `Unset` for most operations throws an `UnsetException`.
-  - Extension properties do not support late-init.
-  - Documentation: New "Late-initialized `val` fields" and "The `Unset` singleton" sections in `docs/OOP.md`.
 
-- Docs: OOP improvements
+### Extern/Kotlin bridge
-  - New page: `docs/scopes_and_closures.md` detailing `ClosureScope` resolution order, recursion‑safe helpers (`chainLookupIgnoreClosure`, `chainLookupWithMembers`, `baseGetIgnoreClosure`), cycle prevention, and capturing lexical environments for callbacks (`snapshotForClosure`).
+- Tightened extern declaration rules:
-  - Updated: `docs/advanced_topics.md` (link to the new page), `docs/parallelism.md` (closures in `launch`/`flow`), `docs/OOP.md` (visibility from closures with preserved `currentClassCtx`), `docs/exceptions_handling.md` (compatibility alias `SymbolNotFound`).
+  - explicit extern members are required for extern class/object declarations.
-  - Tutorial: added quick link to Scopes and Closures.
+- Improved extern generic class behavior and diagnostics.
+- Extended bridge APIs for binding global functions/variables and object/member interop scenarios.
 
-- IDEA plugin: Lightweight autocompletion (experimental)
+### Standard library and modules
-  - Global completion: local declarations, in‑scope parameters, imported modules, and stdlib symbols.
+- Added `lyng.observable` improvements (`ObservableList` hooks/events).
-  - Member completion: after a dot, suggests only members of the inferred receiver type (incl. chained calls like `Path(".." ).lines().` → `Iterator` methods). No global identifiers appear after a dot.
+- Added `Random` stdlib API used by updated samples.
-  - Inheritance-aware: direct class members first, then inherited (e.g., `List` includes `Collection`/`Iterable` methods).
+- Added/extended `lyngio.console` support and CLI integration for console interaction.
-  - Heuristics: handles literals (`"…"` → `String`, numbers → `Int/Real`, `[...]` → `List`, `{...}` → `Dict`) and static `Namespace.` members.
+- Migrated time APIs to `kotlin.time` (`Instant` migration and related docs/tests).
-  - Performance: capped results, early prefix filtering, per‑document MiniAst cache, cancellation checks.
-  - Toggle: Settings | Lyng Formatter → "Enable Lyng autocompletion (experimental)" (default ON).
-  - Stabilization: DEBUG completion/Quick Doc logs are OFF by default; behavior aligned between IDE and isolated engine tests.
 
-- Language: Named arguments and named splats
+### CLI, IDE, and docs/tooling
-  - New call-site syntax for named arguments using colon: `name: value`.
+- CLI:
-    - Positional arguments must come before named; positionals after a named argument inside parentheses are rejected.
+  - added first-class `fmt` command
-    - Trailing-lambda interaction: if the last parameter is already assigned by name (or via a named splat), a trailing `{ ... }` block is illegal.
+  - preserved direct script fast-path invocation
-  - Named splats: `...` can now expand a Map into named arguments.
+  - improved command help/dispatch behavior
-    - Only string keys are allowed; non-string keys raise a clear error.
+- IntelliJ plugin:
-    - Duplicate assignment across named args and named splats is an error.
+  - improved lightweight completion and documentation/inspection behavior
-    - Ellipsis (variadic) parameters remain positional-only and cannot be named.
+  - continued highlighter and Grazie/spellchecking integration work
-  - Rationale: `=` is assignment and an expression in Lyng; `:` at call sites avoids ambiguity. Declarations keep `name: Type`; call-site casts continue to use `as` / `as?`.
+- Docs:
-  - Documentation updated: proposals and declaring-arguments sections now cover named args/splats and error cases.
+  - substantial updates across tutorial/OOP/type/runtime references
-  - Tests added covering success cases and errors for named args/splats and trailing-lambda interactions.
+  - expanded bytecode and advanced topics coverage
 
-- Tooling: Highlighters and TextMate bundle updated for named args
+## Migration checklist for 1.5.x
-  - Website/editor highlighter (lyngweb + site) works with `name: value` and `...Map("k" => v)`; added JS tests covering punctuation/operator spans for `:` and `...`.
-  - TextMate grammar updated to recognize named call arguments: `name: value` after `(` or `,` with `name` highlighted as `variable.parameter.named.lyng` and `:` as punctuation; excludes `::`.
-  - TextMate bundle version bumped to 0.0.3; README updated with details and guidance.
 
-- Multiple Inheritance (MI) completed and enabled by default:
+- If you rely on literal `$...` strings:
-  - Active C3 Method Resolution Order (MRO) for deterministic, monotonic lookup across complex hierarchies and diamonds.
+  - replace with `\$...` or `$$...`, or
-  - Qualified dispatch:
+  - add `// feature: interpolation: off` at file top.
-    - `this@Type.member(...)` inside class bodies starts lookup at the specified ancestor.
+- Review any code relying on interpreter-era fallback behavior; 1.5.x assumes bytecode-first execution.
-    - Cast-based disambiguation: `(expr as Type).member(...)`, `(expr as? Type)?.member(...)` (works with existing safe-call `?.`).
+- For extern declarations, ensure members are explicitly declared where required.
-  - Field inheritance (`val`/`var`) under MI:
+- For named arguments/splats, verify call sites follow stricter ordering/duplication rules.
-    - Instance storage is disambiguated per declaring class; unqualified read/write resolves to the first match in MRO.
-    - Qualified read/write targets the chosen ancestor’s storage.
-  - Constructors and initialization:
-    - Direct bases are initialized left-to-right; each ancestor is initialized at most once (diamond-safe de-duplication).
-    - Header-specified constructor arguments are passed to direct bases.
-  - Visibility enforcement under MI:
-    - `private` visible only inside the declaring class body.
-    - `protected` visible inside the declaring class and its transitive subclasses. Additionally, ancestor classes can access protected members of their descendants if it's an override of a member known to the ancestor. Unrelated contexts cannot access it (qualification/casts do not bypass).
-  - Diagnostics improvements:
-    - Missing member/field messages include receiver class and linearization order; hints for `this@Type` or casts when helpful.
-    - Invalid `this@Type` reports that the qualifier is not an ancestor and shows the receiver lineage.
-    - `as`/`as?` cast errors include actual and target type names.
-
-- Documentation updated (docs/OOP.md and tutorial quick-start) to reflect MI with active C3 MRO.
-
-- CLI: Added `fmt` as a first-class Clikt subcommand.
-  - Default behavior: formats files to stdout (no in-place edits by default).
-  - Options:
-    - `--check`: check only; print files that would change; exit with code 2 if any changes are needed.
-    - `-i, --in-place`: write formatted result back to files.
-    - `--spacing`: apply spacing normalization.
-    - `--wrap`, `--wrapping`: enable line wrapping.
-  - Mutually exclusive: `--check` and `--in-place` together now produce an error and exit with code 1.
-  - Multi-file stdout prints headers `--- <path> ---` per file.
-  - `lyng --help` shows `fmt`; `lyng fmt --help` displays dedicated help.
-  - Fix: Property accessors (`get`, `set`, `private set`, `protected set`) are now correctly indented relative to the property declaration.
-  - Fix: Indentation now correctly carries over into blocks that start on extra‑indented lines (e.g., nested `if` statements or property accessor bodies).
-  - Fix: Formatting Markdown files no longer deletes content in `.lyng` code fences and works correctly with injected files (resolves clobbering, `StringIndexOutOfBoundsException`, and `nonempty text is not covered by block` errors).
-
-- CLI: Preserved legacy script invocation fast-paths:
-  - `lyng script.lyng [args...]` executes the script directly.
-  - `lyng -- -file.lyng [args...]` executes a script whose name begins with `-`.
-
-- CLI: Fixed a regression where the root help banner could print before subcommands.
-  - Root command no longer prints help when a subcommand (e.g., `fmt`) is invoked.

docs/ai_language_reference.md

@@ -17,6 +17,14 @@ Primary sources used: `lynglib/src/commonMain/kotlin/net/sergeych/lyng/{Parser,T
   - Supported escapes: `\n`, `\r`, `\t`, `\"`, `\\`, `\uXXXX` (4 hex digits).
   - Unicode escapes use exactly 4 hex digits (for example: `"\u0416"` -> `Ж`).
   - Unknown `\x` escapes in strings are preserved literally as two characters (`\` and `x`).
+  - String interpolation is supported:
+    - identifier form: `"$name"`
+    - expression form: `"${expr}"`
+    - escaped dollar: `"\$"` and `"$$"` both produce literal `$`.
+    - `\\$x` means backslash + interpolated `x`.
+  - Per-file opt-out is supported via leading comment directive:
+    - `// feature: interpolation: off`
+    - with this directive, `$...` stays literal text.
 - Numbers: `Int` (`123`, `1_000`), `Real` (`1.2`, `1e3`), hex (`0xFF`).
 - Char: `'a'`, escaped chars supported.
   - Supported escapes: `\n`, `\r`, `\t`, `\'`, `\\`, `\uXXXX` (4 hex digits).

docs/lyng.io.console.md

@@ -40,7 +40,18 @@ Console.setCursorVisible(true)
 Console.flush()
 ```
 
-Interactive sample script in this repo:
+#### Tetris sample
+
+The repository includes a full interactive Tetris sample that demonstrates:
+
+- alternate screen rendering
+- raw keyboard input
+- resize handling
+- typed console events
+
+![Lyng Tetris sample](/tetris.png)
+
+Run it from the project root in a real TTY:
 
 ```bash
 lyng examples/tetris_console.lyng
@@ -50,7 +61,7 @@ lyng examples/tetris_console.lyng
 
 - `Console.isSupported(): Bool` — whether console control is available on this platform/runtime.
 - `Console.isTty(): Bool` — whether output is attached to a TTY.
-- `Console.ansiLevel(): String` — `NONE`, `BASIC16`, `ANSI256`, `TRUECOLOR`.
+- `Console.ansiLevel(): ConsoleAnsiLevel` — `NONE`, `BASIC16`, `ANSI256`, `TRUECOLOR`.
 - `Console.geometry(): ConsoleGeometry?` — `{columns, rows}` as typed object or `null`.
 - `Console.details(): ConsoleDetails` — consolidated capability object.
 - `Console.write(text: String)` — writes to console output.
@@ -81,9 +92,9 @@ launch {
 
 #### Event format
 
-`Console.events()` emits `ConsoleEvent` with at least:
+`Console.events()` emits `ConsoleEvent` with:
 
-- `type: String` — `resize`, `keydown`, `keyup`
+- `type: ConsoleEventType` — `UNKNOWN`, `RESIZE`, `KEY_DOWN`, `KEY_UP`
 
 Additional fields:
 

docs/tutorial.md

@@ -1573,6 +1573,52 @@ same as:
     assert(s[1] == 'a')
     >>> void
 
+### String interpolation
+
+Supported forms:
+
+- `$name`
+- `${expr}`
+
+Literal dollar forms:
+
+- `\$` -> `$`
+- `$$` -> `$`
+
+Example:
+
+    val name = "Lyng"
+    assertEquals("hello, Lyng!", "hello, $name!")
+    assertEquals("sum=3", "sum=${1+2}")
+    assertEquals("\$name", "\$name")
+    assertEquals("\$name", "$$name")
+    assertEquals("\\Lyng", "\\$name")
+    >>> void
+
+Interpolation and `printf`-style formatting can be combined when needed:
+
+    val method = "transfer"
+    val argc = 2
+    val compact = "%s:%d"(method, argc)
+    assertEquals("call=transfer:2", "call=$compact")
+    assertEquals("[transfer:2] ok", "[${"%s:%d"(method, argc)}] ok")
+    >>> void
+
+Interpolation also works well with regex patterns. To keep a literal `$` in the
+regex, escape it in the resulting pattern:
+
+    val currency = "USD"
+    val amount = 15
+    val escapedDollar = "\\$"
+    val re = Regex("^${currency}${escapedDollar}${amount}$")
+    assert("USD$15" =~ re)
+    assert("USD15" !~ re)
+    >>> void
+
+If you need old literal behavior in a file, add a leading directive comment:
+
+    // feature: interpolation: off
+
 ### Char literal escapes
 
 Are the same as in string literals with little difference:

examples/tetris_console.lyng

@@ -8,15 +8,25 @@
  *  - Up arrow or W: rotate
  *  - Down arrow or S: soft drop
  *  - Space: hard drop
- *  - Q or Escape: quit
+ *  - P or Escape: pause
+ *  - Q: quit
+
+    Tsted to score:
+sergeych@sergeych-XPS-17-9720:~$ ~/dev/lyng/examples/tetris_console.lyng
+Bye.
+Score: 435480
+Lines: 271
+Level: 28
+Ssergeych@sergeych-XPS-17-9720:~$
  */
 
 import lyng.io.console
+import lyng.io.fs
 
 val MIN_COLS = 56
 val MIN_ROWS = 24
 val PANEL_WIDTH = 24
-val BOARD_MARGIN_ROWS = 8
+val BOARD_MARGIN_ROWS = 5
 val BOARD_MIN_W = 10
 val BOARD_MAX_W = 16
 val BOARD_MIN_H = 16
@@ -26,9 +36,11 @@ val DROP_FRAMES_BASE = 15
 val DROP_FRAMES_MIN = 3
 val FRAME_DELAY_MS = 35
 val RESIZE_WAIT_MS = 250
+val MAX_PENDING_INPUTS = 64
 val ROTATION_KICKS = [0, -1, 1, -2, 2]
 val ANSI_ESC = "\u001b["
 val ANSI_RESET = ANSI_ESC + "0m"
+val ERROR_LOG_PATH = "/tmp/lyng_tetris_errors.log"
 val UNICODE_BLOCK = "██"
 val UNICODE_TOP_LEFT = "┌"
 val UNICODE_TOP_RIGHT = "┐"
@@ -64,6 +76,7 @@ class GameState(
     var level = 1
     var running = true
     var gameOver = false
+    var paused = false
 }
 class LoopFrame(val resized: Bool, val originRow: Int, val originCol: Int) {}
 
@@ -72,44 +85,44 @@ fun clearAndHome() {
     Console.home()
 }
 
+fun logError(message: String, err: Object?): Void {
+    try {
+        var details = ""
+        if (err != null) {
+            try {
+                details = ": " + err
+            } catch (_: Object) {
+                details = ": <error-format-failed>"
+            }
+        }
+        Path(ERROR_LOG_PATH).appendUtf8(message + details + "\n")
+    } catch (_: Object) {
+        // Never let logging errors affect gameplay.
+    }
+}
+
 fun repeatText(s: String, n: Int): String {
     var out: String = ""
-    var i = 0
+    for (i in 0..<n) {
-    while (i < n) {
         out += s
-        i = i + 1
     }
     out
 }
 
-fun maxInt(a: Int, b: Int): Int {
+fun max<T>(a: T, b: T): T = if (a > b) a else b
-    if (a > b) a else b
-}
-
-fun minInt(a: Int, b: Int): Int {
-    if (a < b) a else b
-}
-
-fun clampInt(v: Int, lo: Int, hi: Int): Int {
-    minInt(hi, maxInt(lo, v))
-}
 
 fun emptyRow(width: Int): Row {
     val r: Row = []
-    var x = 0
+    for (x in 0..<width) {
-    while (x < width) {
         r.add(0)
-        x = x + 1
     }
     r
 }
 
 fun createBoard(width: Int, height: Int): Board {
     val b: Board = []
-    var y = 0
+    for (y in 0..<height) {
-    while (y < height) {
         b.add(emptyRow(width))
-        y = y + 1
     }
     b
 }
@@ -139,7 +152,10 @@ fun emptyCellText(useColor: Bool): String {
 }
 
 fun canPlace(board: Board, boardW: Int, boardH: Int, pieceId: Int, rot: Int, px: Int, py: Int): Bool {
+    try {
+        if (pieceId < 1 || pieceId > 7) return false
         val piece: Piece = PIECES[pieceId - 1]
+        if (rot < 0 || rot >= piece.rotations.size) return false
         val cells = piece.rotations[rot]
 
         for (cell in cells) {
@@ -150,11 +166,16 @@ fun canPlace(board: Board, boardW: Int, boardH: Int, pieceId: Int, rot: Int, px:
             if (y >= boardH) return false
 
             if (y >= 0) {
+                if (y >= board.size) return false
                 val row = board[y]
+                if (row == null) return false
                 if (row[x] != 0) return false
             }
         }
         true
+    } catch (_: Object) {
+        false
+    }
 }
 
 fun lockPiece(board: Board, pieceId: Int, rot: Int, px: Int, py: Int): Void {
@@ -165,11 +186,13 @@ fun lockPiece(board: Board, pieceId: Int, rot: Int, px: Int, py: Int): Void {
         val x = px + cell[0]
         val y = py + cell[1]
 
-        if (y >= 0) {
+        if (y >= 0 && y < board.size) {
             val row = board[y]
+            if (row != null) {
                 row[x] = pieceId
             }
         }
+    }
 }
 
 fun clearCompletedLines(board: Board, boardW: Int, boardH: Int): Int {
@@ -178,23 +201,31 @@ fun clearCompletedLines(board: Board, boardW: Int, boardH: Int): Int {
     var cleared = 0
 
     while (y >= 0) {
+        if (y >= b.size) {
+            y--
+            continue
+        }
         val row = b[y]
+        if (row == null) {
+            b.removeAt(y)
+            b.insertAt(0, emptyRow(boardW))
+            cleared++
+            continue
+        }
         var full = true
-        var x = 0
+        for (x in 0..<boardW) {
-        while (x < boardW) {
             if (row[x] == 0) {
                 full = false
                 break
             }
-            x = x + 1
         }
 
         if (full) {
             b.removeAt(y)
             b.insertAt(0, emptyRow(boardW))
-            cleared = cleared + 1
+            cleared++
         } else {
-            y = y - 1
+            y--
         }
     }
 
@@ -220,7 +251,7 @@ fun tryRotateCw(board: Board, boardW: Int, boardH: Int, pieceId: Int, rot: Int,
     val nr = (rot + 1) % rotations
     for (kx in ROTATION_KICKS) {
         val nx = px + kx
-        if (canPlace(board, boardW, boardH, pieceId, nr, nx, py)) {
+        if (canPlace(board, boardW, boardH, pieceId, nr, nx, py) == true) {
             return RotateResult(true, nr, nx)
         }
     }
@@ -230,21 +261,18 @@ fun tryRotateCw(board: Board, boardW: Int, boardH: Int, pieceId: Int, rot: Int,
 fun nextPreviewLines(pieceId: Int, useColor: Bool): List<String> {
     val out: List<String> = []
     if (pieceId <= 0) {
+        for (i in 0..<4) {
             out.add("        ")
-        out.add("        ")
+        }
-        out.add("        ")
-        out.add("        ")
         return out
     }
 
     val piece: Piece = PIECES[pieceId - 1]
     val cells = piece.rotations[0]
 
-    var y = 0
+    for (y in 0..<4) {
-    while (y < 4) {
         var line = ""
-        var x = 0
+        for (x in 0..<4) {
-        while (x < 4) {
             var filled = false
             for (cell in cells) {
                 if (cell[0] == x && cell[1] == y) {
@@ -253,10 +281,8 @@ fun nextPreviewLines(pieceId: Int, useColor: Bool): List<String> {
                 }
             }
             line += if (filled) blockText(pieceId, useColor) else "  "
-            x = x + 1
         }
         out.add(line)
-        y = y + 1
     }
     out
 }
@@ -296,52 +322,101 @@ fun render(
     panel.add("W/Up: rotate")
     panel.add("S/Down: drop")
     panel.add("Space: hard drop")
-    panel.add("Q/Esc: quit")
+    panel.add("P/Esc: pause")
+    panel.add("Q: quit")
 
     val frameLines: List<String> = []
 
-    var y = 0
+    for (y in 0..<boardH) {
-    while (y < boardH) {
         var line = UNICODE_VERTICAL
 
-        var x = 0
+        for (x in 0..<boardW) {
-        while (x < boardW) {
             val a = activeCellId(state.pieceId, state.rot, state.px, state.py, x, y)
-            val row = board[y]
+            val row = if (y < board.size) board[y] else null
-            val b = row[x]
+            val b = if (row == null) 0 else row[x]
             val id = if (a > 0) a else b
             line += if (id > 0) blockText(id, useColor) else emptyCellText(useColor)
-            x = x + 1
         }
 
         line += UNICODE_VERTICAL
 
-        val p = y
+        if (y < panel.size) {
-        if (p < panel.size) {
+            line += "   " + panel[y]
-            line += "   " + panel[p]
         }
 
         frameLines.add(line)
-        y = y + 1
     }
 
     frameLines.add(bottomBorder)
 
-    val prev = prevFrameLines
+    for (i in 0..<frameLines.size) {
-    var i = 0
-    while (i < frameLines.size) {
         val line = frameLines[i]
-        val old = if (i < prev.size) prev[i] else null
+        val old = if (i < prevFrameLines.size) prevFrameLines[i] else null
         if (old != line) {
             Console.moveTo(originRow + i, originCol)
             Console.clearLine()
             Console.write(line)
         }
-        i = i + 1
     }
     frameLines
 }
 
+fun fitLine(line: String, width: Int): String {
+    val maxLen = if (width > 0) width else 0
+    if (maxLen <= 0) return ""
+    if (line.size >= maxLen) return line[..<maxLen]
+    line + repeatText(" ", maxLen - line.size)
+}
+
+fun renderPauseOverlay(
+    originRow: Int,
+    originCol: Int,
+    boardW: Int,
+    boardH: Int,
+): Void {
+    val contentWidth = boardW * 2 + 2 + 3 + PANEL_WIDTH
+    val contentHeight = boardH + 1
+
+    val lines: List<String> = []
+    lines.add("PAUSED")
+    lines.add("")
+    lines.add("Any key: continue game")
+    lines.add("Esc: exit game")
+    lines.add("")
+    lines.add("Move: A/D or arrows")
+    lines.add("Rotate: W or Up")
+    lines.add("Drop: S/Down, Space hard drop")
+
+    var innerWidth = 0
+    for (line in lines) {
+        if (line.size > innerWidth) innerWidth = line.size
+    }
+    innerWidth += 4
+    val maxInner = max(12, contentWidth - 2)
+    if (innerWidth > maxInner) innerWidth = maxInner
+    if (innerWidth % 2 != 0) innerWidth--
+
+    val boxWidth = innerWidth + 2
+    val boxHeight = lines.size + 2
+
+    val left = originCol + max(0, (contentWidth - boxWidth) / 2)
+    val top = originRow + max(0, (contentHeight - boxHeight) / 2)
+
+    val topBorder = UNICODE_TOP_LEFT + repeatText(UNICODE_HORIZONTAL, innerWidth / 2) + UNICODE_TOP_RIGHT
+    val bottomBorder = UNICODE_BOTTOM_LEFT + repeatText(UNICODE_HORIZONTAL, innerWidth / 2) + UNICODE_BOTTOM_RIGHT
+
+    Console.moveTo(top, left)
+    Console.write(topBorder)
+
+    for (i in 0..<lines.size) {
+        Console.moveTo(top + 1 + i, left)
+        Console.write(UNICODE_VERTICAL + fitLine("  " + lines[i], innerWidth) + UNICODE_VERTICAL)
+    }
+
+    Console.moveTo(top + boxHeight - 1, left)
+    Console.write(bottomBorder)
+}
+
 fun waitForMinimumSize(minCols: Int, minRows: Int): Object {
     while (true) {
         val g = Console.geometry()
@@ -351,9 +426,23 @@ fun waitForMinimumSize(minCols: Int, minRows: Int): Object {
         if (cols >= minCols && rows >= minRows) return g
 
         clearAndHome()
-        println("Lyng Tetris needs at least %sx%s terminal size."(minCols, minRows))
+        val lines: List<String> = []
-        println("Current: %sx%s"(cols, rows))
+        lines.add("Lyng Tetris needs at least %sx%s terminal size."(minCols, minRows))
-        println("Resize the console window to continue...")
+        lines.add("Current: %sx%s"(cols, rows))
+        lines.add("Resize the console window to continue.")
+
+        val visibleLines = if (rows < lines.size) rows else lines.size
+        if (visibleLines > 0) {
+            val startRow = max(1, ((rows - visibleLines) / 2) + 1)
+            for (i in 0..<visibleLines) {
+                val line = lines[i]
+                val startCol = max(1, ((cols - line.size) / 2) + 1)
+                Console.moveTo(startRow + i, startCol)
+                Console.clearLine()
+                Console.write(line)
+            }
+            Console.flush()
+        }
         delay(RESIZE_WAIT_MS)
     }
 }
@@ -434,8 +523,8 @@ if (!Console.isSupported()) {
     val cols = g0?.columns ?: MIN_COLS
     val rows = g0?.rows ?: MIN_ROWS
 
-    val boardW = clampInt((cols - PANEL_WIDTH) / 2, BOARD_MIN_W, BOARD_MAX_W)
+    val boardW = clamp((cols - PANEL_WIDTH) / 2, BOARD_MIN_W..BOARD_MAX_W)
-    val boardH = clampInt(rows - BOARD_MARGIN_ROWS, BOARD_MIN_H, BOARD_MAX_H)
+    val boardH = clamp(rows - BOARD_MARGIN_ROWS, BOARD_MIN_H..BOARD_MAX_H)
 
     val board: Board = createBoard(boardW, boardH)
 
@@ -452,8 +541,9 @@ if (!Console.isSupported()) {
     )
     var prevFrameLines: List<String> = []
 
-    val gameMutex = Mutex()
+    val gameMutex: Mutex = Mutex()
-    var hasResizeEvent = false
+    var forceRedraw = false
+    val pendingInputs: List<String> = []
 
     val rawModeEnabled = Console.setRawMode(true)
     if (!rawModeEnabled) {
@@ -461,20 +551,43 @@ if (!Console.isSupported()) {
         println("Use jlyng in an interactive terminal with raw input support.")
         void
     } else {
-        val useColor = Console.ansiLevel() != "NONE"
+        val useColor = Console.ansiLevel() != ConsoleAnsiLevel.NONE
         Console.enterAltScreen()
         Console.setCursorVisible(false)
         clearAndHome()
 
+        fun resetActivePiece(s: GameState): Void {
+            s.pieceId = nextPieceId()
+            s.rot = 0
+            s.px = (boardW / 2) - 2
+            s.py = -1
+        }
+
         fun applyKeyInput(s: GameState, key: String): Void {
-            if (key == "__CTRL_C__" || key == "q" || key == "Q" || key == "Escape") {
+            try {
+                if (key == "__CTRL_C__") {
+                    s.running = false
+                }
+                else if (s.paused) {
+                    if (key == "Escape") {
+                        s.running = false
+                    } else {
+                        s.paused = false
+                        forceRedraw = true
+                    }
+                }
+                else if (key == "p" || key == "P" || key == "Escape") {
+                    s.paused = true
+                    forceRedraw = true
+                }
+                else if (key == "q" || key == "Q") {
                     s.running = false
                 }
                 else if (key == "ArrowLeft" || key == "a" || key == "A") {
-                if (canPlace(board, boardW, boardH, s.pieceId, s.rot, s.px - 1, s.py)) s.px = s.px - 1
+                    if (canPlace(board, boardW, boardH, s.pieceId, s.rot, s.px - 1, s.py) == true) s.px--
                 }
                 else if (key == "ArrowRight" || key == "d" || key == "D") {
-                if (canPlace(board, boardW, boardH, s.pieceId, s.rot, s.px + 1, s.py)) s.px = s.px + 1
+                    if (canPlace(board, boardW, boardH, s.pieceId, s.rot, s.px + 1, s.py) == true) s.px++
                 }
                 else if (key == "ArrowUp" || key == "w" || key == "W") {
                     val rr: RotateResult = tryRotateCw(board, boardW, boardH, s.pieceId, s.rot, s.px, s.py)
@@ -484,17 +597,21 @@ if (!Console.isSupported()) {
                     }
                 }
                 else if (key == "ArrowDown" || key == "s" || key == "S") {
-                if (canPlace(board, boardW, boardH, s.pieceId, s.rot, s.px, s.py + 1)) {
+                    if (canPlace(board, boardW, boardH, s.pieceId, s.rot, s.px, s.py + 1) == true) {
-                    s.py = s.py + 1
+                        s.py++
-                    s.score = s.score + 1
+                        s.score++
                     }
                 }
                 else if (key == " ") {
-                while (canPlace(board, boardW, boardH, s.pieceId, s.rot, s.px, s.py + 1)) {
+                    while (canPlace(board, boardW, boardH, s.pieceId, s.rot, s.px, s.py + 1) == true) {
-                    s.py = s.py + 1
+                        s.py++
-                    s.score = s.score + 2
+                        s.score += 2
                     }
                 }
+            } catch (inputErr: Object) {
+                logError("applyKeyInput recovered after error", inputErr)
+                resetActivePiece(s)
+            }
         }
 
         var inputRunning = true
@@ -503,26 +620,47 @@ if (!Console.isSupported()) {
                 try {
                     for (ev in Console.events()) {
                         if (!inputRunning) break
+
+                        // Isolate per-event failures so one bad event does not unwind the stream.
+                        try {
                             if (ev is ConsoleKeyEvent) {
                                 val ke = ev as ConsoleKeyEvent
-                            if (ke.type == "keydown") {
+                                if (ke.type == ConsoleEventType.KEY_DOWN) {
-                                val key = ke.key
+                                    var key = ""
-                                val ctrl = ke.ctrl
+                                    var ctrl = false
-                                gameMutex.withLock {
+                                    try {
+                                        key = ke.key
+                                    } catch (keyErr: Object) {
+                                        logError("Input key read error", keyErr)
+                                    }
+                                    try {
+                                        ctrl = ke.ctrl == true
+                                    } catch (_: Object) {
+                                        ctrl = false
+                                    }
+                                    if (key == "") {
+                                        logError("Dropped key event with empty/null key", null)
+                                        continue
+                                    }
                                     val mapped = if (ctrl && (key == "c" || key == "C")) "__CTRL_C__" else key
-                                    applyKeyInput(state, mapped)
+                                    val mm: Mutex = gameMutex
+                                    mm.withLock {
+                                        if (pendingInputs.size >= MAX_PENDING_INPUTS) {
+                                            pendingInputs.removeAt(0)
                                         }
-                            }
+                                        pendingInputs.add(mapped)
-                        } else if (ev is ConsoleResizeEvent) {
-                            gameMutex.withLock {
-                                hasResizeEvent = true
-                                prevFrameLines = []
                                     }
                                 }
                             }
-                } catch (err: Exception) {
+                        } catch (eventErr: Object) {
-                    // Keep game alive: transient console-event failures should not force quit.
+                            // Keep the input stream alive; report for diagnostics.
+                            logError("Input event error", eventErr)
+                        }
+                    }
+                } catch (err: Object) {
+                    // Recover stream-level failures by recreating event stream in next loop turn.
                     if (!inputRunning) break
+                    logError("Input stream recovered after error", err)
                     Console.setRawMode(true)
                     delay(50)
                 }
@@ -540,16 +678,10 @@ if (!Console.isSupported()) {
                 return null
             }
 
-            var resized = false
-            gameMutex.withLock {
-                resized = hasResizeEvent
-                hasResizeEvent = false
-            }
-
             val contentCols = boardW * 2 + 2 + 3 + PANEL_WIDTH
             val contentRows = boardH + 1
-            val requiredCols = maxInt(MIN_COLS, contentCols)
+            val requiredCols = max(MIN_COLS, contentCols)
-            val requiredRows = maxInt(MIN_ROWS, contentRows)
+            val requiredRows = max(MIN_ROWS, contentRows)
             if (c < requiredCols || r < requiredRows) {
                 waitForMinimumSize(requiredCols, requiredRows)
                 clearAndHome()
@@ -557,21 +689,21 @@ if (!Console.isSupported()) {
                 return null
             }
 
-            val originCol = maxInt(1, ((c - contentCols) / 2) + 1)
+            val originCol = max(1, ((c - contentCols) / 2) + 1)
-            val originRow = maxInt(1, ((r - contentRows) / 2) + 1)
+            val originRow = max(1, ((r - contentRows) / 2) + 1)
-            LoopFrame(resized, originRow, originCol)
+            LoopFrame(false, originRow, originCol)
         }
 
         fun advanceGravity(s: GameState, frame: Int): Int {
             s.level = 1 + (s.totalLines / LEVEL_LINES_STEP)
-            val dropEvery = maxInt(DROP_FRAMES_MIN, DROP_FRAMES_BASE - s.level)
+            val dropEvery = max(DROP_FRAMES_MIN, DROP_FRAMES_BASE - s.level)
 
             var nextFrame = frame + 1
             if (nextFrame < dropEvery) return nextFrame
             nextFrame = 0
 
-            if (canPlace(board, boardW, boardH, s.pieceId, s.rot, s.px, s.py + 1)) {
+            if (canPlace(board, boardW, boardH, s.pieceId, s.rot, s.px, s.py + 1) == true) {
-                s.py = s.py + 1
+                s.py++
                 return nextFrame
             }
 
@@ -579,8 +711,8 @@ if (!Console.isSupported()) {
 
             val cleared = clearCompletedLines(board, boardW, boardH)
             if (cleared > 0) {
-                s.totalLines = s.totalLines + cleared
+                s.totalLines += cleared
-                s.score = s.score + scoreForLines(cleared, s.level)
+                s.score += scoreForLines(cleared, s.level)
             }
 
             s.pieceId = s.nextId
@@ -605,25 +737,45 @@ if (!Console.isSupported()) {
             var shouldStop = false
             var prevOriginRow = -1
             var prevOriginCol = -1
+            var prevPaused = false
             while (!shouldStop) {
                 val frameData = pollLoopFrame()
                 if (frameData == null) {
                     frame = 0
+                    prevPaused = false
                     continue
                 }
 
-                gameMutex.withLock {
+                val mm: Mutex = gameMutex
+                mm.withLock {
+                    if (pendingInputs.size > 0) {
+                        val toApply: List<String> = []
+                        while (pendingInputs.size > 0) {
+                            val k = pendingInputs[0]
+                            pendingInputs.removeAt(0)
+                            toApply.add(k)
+                        }
+                        for (k in toApply) {
+                            applyKeyInput(state, k)
+                            if (!state.running || state.gameOver) break
+                        }
+                    }
+                }
                 if (!state.running || state.gameOver) {
                     shouldStop = true
                 } else {
+                    val localForceRedraw = forceRedraw
+                    forceRedraw = false
                     val movedOrigin = frameData.originRow != prevOriginRow || frameData.originCol != prevOriginCol
-                        if (frameData.resized || movedOrigin) {
+                    if (frameData.resized || movedOrigin || localForceRedraw) {
                         clearAndHome()
                         prevFrameLines = []
                     }
                     prevOriginRow = frameData.originRow
                     prevOriginCol = frameData.originCol
+                    if (!state.paused) {
                         frame = advanceGravity(state, frame)
+                    }
                     prevFrameLines = render(
                         state,
                         board,
@@ -634,7 +786,10 @@ if (!Console.isSupported()) {
                         frameData.originCol,
                         useColor
                     )
+                    if (state.paused && (!prevPaused || frameData.resized || movedOrigin)) {
+                        renderPauseOverlay(frameData.originRow, frameData.originCol, boardW, boardH)
                     }
+                    prevPaused = state.paused
                 }
                 Console.flush()
                 delay(FRAME_DELAY_MS)

lyngio/build.gradle.kts

@@ -112,6 +112,64 @@ kotlin {
     }
 }
 
+abstract class GenerateLyngioConsoleDecls : DefaultTask() {
+    @get:InputFile
+    @get:PathSensitive(PathSensitivity.RELATIVE)
+    abstract val sourceFile: RegularFileProperty
+
+    @get:OutputDirectory
+    abstract val outputDir: DirectoryProperty
+
+    @TaskAction
+    fun generate() {
+        val targetPkg = "net.sergeych.lyngio.stdlib_included"
+        val pkgPath = targetPkg.replace('.', '/')
+        val targetDir = outputDir.get().asFile.resolve(pkgPath)
+        targetDir.mkdirs()
+
+        val text = sourceFile.get().asFile.readText()
+        fun escapeForQuoted(s: String): String = buildString {
+            for (ch in s) when (ch) {
+                '\\' -> append("\\\\")
+                '"' -> append("\\\"")
+                '\n' -> append("\\n")
+                '\r' -> {}
+                '\t' -> append("\\t")
+                else -> append(ch)
+            }
+        }
+
+        val out = buildString {
+            append("package ").append(targetPkg).append("\n\n")
+            append("@Suppress(\"Unused\", \"MemberVisibilityCanBePrivate\")\n")
+            append("internal val consoleLyng = \"")
+            append(escapeForQuoted(text))
+            append("\"\n")
+        }
+        targetDir.resolve("console_types_lyng.generated.kt").writeText(out)
+    }
+}
+
+val lyngioConsoleDeclsFile = layout.projectDirectory.file("stdlib/lyng/io/console.lyng")
+val generatedLyngioDeclsDir = layout.buildDirectory.dir("generated/source/lyngioDecls/commonMain/kotlin")
+
+val generateLyngioConsoleDecls by tasks.registering(GenerateLyngioConsoleDecls::class) {
+    sourceFile.set(lyngioConsoleDeclsFile)
+    outputDir.set(generatedLyngioDeclsDir)
+}
+
+kotlin.sourceSets.named("commonMain") {
+    kotlin.srcDir(generateLyngioConsoleDecls)
+}
+
+kotlin.targets.configureEach {
+    compilations.configureEach {
+        compileTaskProvider.configure {
+            dependsOn(generateLyngioConsoleDecls)
+        }
+    }
+}
+
 android {
     namespace = "net.sergeych.lyngio"
     compileSdk = libs.versions.android.compileSdk.get().toInt()

lyngio/src/commonMain/kotlin/net/sergeych/lyng/io/console/LyngConsoleModule.kt

@@ -20,9 +20,11 @@ package net.sergeych.lyng.io.console
 import net.sergeych.lyng.ModuleScope
 import net.sergeych.lyng.Scope
 import net.sergeych.lyng.ScopeFacade
-import net.sergeych.lyng.miniast.*
+import net.sergeych.lyng.Source
 import net.sergeych.lyng.obj.Obj
 import net.sergeych.lyng.obj.ObjBool
+import net.sergeych.lyng.obj.ObjEnumClass
+import net.sergeych.lyng.obj.ObjEnumEntry
 import net.sergeych.lyng.obj.ObjIterable
 import net.sergeych.lyng.obj.ObjIterationFinishedException
 import net.sergeych.lyng.obj.ObjIterator
@@ -35,13 +37,13 @@ import net.sergeych.lyng.obj.toObj
 import net.sergeych.lyng.pacman.ImportManager
 import net.sergeych.lyng.raiseIllegalOperation
 import net.sergeych.lyng.requireScope
-import net.sergeych.lyngio.console.ConsoleEvent
+import net.sergeych.lyngio.console.*
-import net.sergeych.lyngio.console.ConsoleEventSource
-import net.sergeych.lyngio.console.LyngConsole
-import net.sergeych.lyngio.console.getSystemConsole
 import net.sergeych.lyngio.console.security.ConsoleAccessDeniedException
 import net.sergeych.lyngio.console.security.ConsoleAccessPolicy
 import net.sergeych.lyngio.console.security.LyngConsoleSecured
+import net.sergeych.lyngio.stdlib_included.consoleLyng
+
+private const val CONSOLE_MODULE_NAME = "lyng.io.console"
 
 /**
  * Install Lyng module `lyng.io.console` into the given scope's ImportManager.
@@ -53,10 +55,9 @@ fun createConsole(policy: ConsoleAccessPolicy, scope: Scope): Boolean = createCo
 
 /** Same as [createConsoleModule] but with explicit [ImportManager]. */
 fun createConsoleModule(policy: ConsoleAccessPolicy, manager: ImportManager): Boolean {
-    val name = "lyng.io.console"
+    if (manager.packageNames.contains(CONSOLE_MODULE_NAME)) return false
-    if (manager.packageNames.contains(name)) return false
 
-    manager.addPackage(name) { module ->
+    manager.addPackage(CONSOLE_MODULE_NAME) { module ->
         buildConsoleModule(module, policy)
     }
     return true
@@ -65,59 +66,37 @@ fun createConsoleModule(policy: ConsoleAccessPolicy, manager: ImportManager): Bo
 fun createConsole(policy: ConsoleAccessPolicy, manager: ImportManager): Boolean = createConsoleModule(policy, manager)
 
 private suspend fun buildConsoleModule(module: ModuleScope, policy: ConsoleAccessPolicy) {
+    // Load Lyng declarations for console enums/types first (module-local source of truth).
+    module.eval(Source(CONSOLE_MODULE_NAME, consoleLyng))
+    ConsoleEnums.initialize(module)
     val console: LyngConsole = LyngConsoleSecured(getSystemConsole(), policy)
 
     val consoleType = object : net.sergeych.lyng.obj.ObjClass("Console") {}
 
     consoleType.apply {
-        addClassFnDoc(
+        addClassFn("isSupported") {
-            name = "isSupported",
-            doc = "Whether console control API is supported on this platform.",
-            returns = type("lyng.Bool"),
-            moduleName = module.packageName
-        ) {
             ObjBool(console.isSupported)
         }
 
-        addClassFnDoc(
+        addClassFn("isTty") {
-            name = "isTty",
-            doc = "Whether current stdout is attached to an interactive TTY.",
-            returns = type("lyng.Bool"),
-            moduleName = module.packageName
-        ) {
             consoleGuard {
                 ObjBool(console.isTty())
             }
         }
 
-        addClassFnDoc(
+        addClassFn("ansiLevel") {
-            name = "ansiLevel",
-            doc = "Detected ANSI color capability: NONE, BASIC16, ANSI256, TRUECOLOR.",
-            returns = type("lyng.String"),
-            moduleName = module.packageName
-        ) {
             consoleGuard {
-                ObjString(console.ansiLevel().name)
+                ConsoleEnums.ansiLevel(console.ansiLevel().name)
             }
         }
 
-        addClassFnDoc(
+        addClassFn("geometry") {
-            name = "geometry",
-            doc = "Current terminal geometry or null.",
-            returns = type("ConsoleGeometry", nullable = true),
-            moduleName = module.packageName
-        ) {
             consoleGuard {
                 console.geometry()?.let { ObjConsoleGeometry(it.columns, it.rows) } ?: ObjNull
             }
         }
 
-        addClassFnDoc(
+        addClassFn("details") {
-            name = "details",
-            doc = "Get consolidated console details.",
-            returns = type("ConsoleDetails"),
-            moduleName = module.packageName
-        ) {
             consoleGuard {
                 val tty = console.isTty()
                 val ansi = console.ansiLevel()
@@ -125,18 +104,13 @@ private suspend fun buildConsoleModule(module: ModuleScope, policy: ConsoleAcces
                 ObjConsoleDetails(
                     supported = console.isSupported,
                     isTty = tty,
-                    ansiLevel = ansi.name,
+                    ansiLevel = ConsoleEnums.ansiLevel(ansi.name),
                     geometry = geometry?.let { ObjConsoleGeometry(it.columns, it.rows) },
                 )
             }
         }
 
-        addClassFnDoc(
+        addClassFn("write") {
-            name = "write",
-            doc = "Write text directly to console output.",
-            params = listOf(ParamDoc("text", type("lyng.String"))),
-            moduleName = module.packageName
-        ) {
             consoleGuard {
                 val text = requiredArg<ObjString>(0).value
                 console.write(text)
@@ -144,48 +118,28 @@ private suspend fun buildConsoleModule(module: ModuleScope, policy: ConsoleAcces
             }
         }
 
-        addClassFnDoc(
+        addClassFn("flush") {
-            name = "flush",
-            doc = "Flush console output buffer.",
-            moduleName = module.packageName
-        ) {
             consoleGuard {
                 console.flush()
                 ObjVoid
             }
         }
 
-        addClassFnDoc(
+        addClassFn("home") {
-            name = "home",
-            doc = "Move cursor to home position (1,1).",
-            moduleName = module.packageName
-        ) {
             consoleGuard {
                 console.write("\u001B[H")
                 ObjVoid
             }
         }
 
-        addClassFnDoc(
+        addClassFn("clear") {
-            name = "clear",
-            doc = "Clear the visible screen buffer.",
-            moduleName = module.packageName
-        ) {
             consoleGuard {
                 console.write("\u001B[2J")
                 ObjVoid
             }
         }
 
-        addClassFnDoc(
+        addClassFn("moveTo") {
-            name = "moveTo",
-            doc = "Move cursor to 1-based row and column.",
-            params = listOf(
-                ParamDoc("row", type("lyng.Int")),
-                ParamDoc("column", type("lyng.Int")),
-            ),
-            moduleName = module.packageName
-        ) {
             consoleGuard {
                 val row = requiredArg<net.sergeych.lyng.obj.ObjInt>(0).value
                 val col = requiredArg<net.sergeych.lyng.obj.ObjInt>(1).value
@@ -194,45 +148,28 @@ private suspend fun buildConsoleModule(module: ModuleScope, policy: ConsoleAcces
             }
         }
 
-        addClassFnDoc(
+        addClassFn("clearLine") {
-            name = "clearLine",
-            doc = "Clear the current line.",
-            moduleName = module.packageName
-        ) {
             consoleGuard {
                 console.write("\u001B[2K")
                 ObjVoid
             }
         }
 
-        addClassFnDoc(
+        addClassFn("enterAltScreen") {
-            name = "enterAltScreen",
-            doc = "Switch to terminal alternate screen buffer.",
-            moduleName = module.packageName
-        ) {
             consoleGuard {
                 console.write("\u001B[?1049h")
                 ObjVoid
             }
         }
 
-        addClassFnDoc(
+        addClassFn("leaveAltScreen") {
-            name = "leaveAltScreen",
-            doc = "Return from alternate screen buffer to normal screen.",
-            moduleName = module.packageName
-        ) {
             consoleGuard {
                 console.write("\u001B[?1049l")
                 ObjVoid
             }
         }
 
-        addClassFnDoc(
+        addClassFn("setCursorVisible") {
-            name = "setCursorVisible",
-            doc = "Show or hide the terminal cursor.",
-            params = listOf(ParamDoc("visible", type("lyng.Bool"))),
-            moduleName = module.packageName
-        ) {
             consoleGuard {
                 val visible = requiredArg<ObjBool>(0).value
                 console.write(if (visible) "\u001B[?25h" else "\u001B[?25l")
@@ -240,24 +177,13 @@ private suspend fun buildConsoleModule(module: ModuleScope, policy: ConsoleAcces
             }
         }
 
-        addClassFnDoc(
+        addClassFn("events") {
-            name = "events",
-            doc = "Endless iterable console event source (resize, keydown, keyup). Use in a loop, often inside launch.",
-            returns = type("ConsoleEventStream"),
-            moduleName = module.packageName
-        ) {
             consoleGuard {
                 console.events().toConsoleEventStream()
             }
         }
 
-        addClassFnDoc(
+        addClassFn("setRawMode") {
-            name = "setRawMode",
-            doc = "Enable or disable raw keyboard mode. Returns true if mode changed.",
-            params = listOf(ParamDoc("enabled", type("lyng.Bool"))),
-            returns = type("lyng.Bool"),
-            moduleName = module.packageName
-        ) {
             consoleGuard {
                 val enabled = requiredArg<ObjBool>(0).value
                 ObjBool(console.setRawMode(enabled))
@@ -265,55 +191,13 @@ private suspend fun buildConsoleModule(module: ModuleScope, policy: ConsoleAcces
         }
     }
 
-    module.addConstDoc(
+    module.addConst("Console", consoleType)
-        name = "Console",
+    module.addConst("ConsoleGeometry", ObjConsoleGeometry.type)
-        value = consoleType,
+    module.addConst("ConsoleDetails", ObjConsoleDetails.type)
-        doc = "Console runtime API.",
+    module.addConst("ConsoleEvent", ObjConsoleEvent.type)
-        type = type("Console"),
+    module.addConst("ConsoleResizeEvent", ObjConsoleResizeEvent.type)
-        moduleName = module.packageName
+    module.addConst("ConsoleKeyEvent", ObjConsoleKeyEvent.typeObj)
-    )
+    module.addConst("ConsoleEventStream", ObjConsoleEventStream.type)
-    module.addConstDoc(
-        name = "ConsoleGeometry",
-        value = ObjConsoleGeometry.type,
-        doc = "Terminal geometry.",
-        type = type("lyng.Class"),
-        moduleName = module.packageName
-    )
-    module.addConstDoc(
-        name = "ConsoleDetails",
-        value = ObjConsoleDetails.type,
-        doc = "Consolidated console capability details.",
-        type = type("lyng.Class"),
-        moduleName = module.packageName
-    )
-    module.addConstDoc(
-        name = "ConsoleEvent",
-        value = ObjConsoleEvent.type,
-        doc = "Base class for console events.",
-        type = type("lyng.Class"),
-        moduleName = module.packageName
-    )
-    module.addConstDoc(
-        name = "ConsoleResizeEvent",
-        value = ObjConsoleResizeEvent.type,
-        doc = "Terminal resize event.",
-        type = type("lyng.Class"),
-        moduleName = module.packageName
-    )
-    module.addConstDoc(
-        name = "ConsoleKeyEvent",
-        value = ObjConsoleKeyEvent.typeObj,
-        doc = "Keyboard event.",
-        type = type("lyng.Class"),
-        moduleName = module.packageName
-    )
-    module.addConstDoc(
-        name = "ConsoleEventStream",
-        value = ObjConsoleEventStream.type,
-        doc = "Endless iterable stream of console events.",
-        type = type("lyng.Class"),
-        moduleName = module.packageName
-    )
 }
 
 private suspend inline fun ScopeFacade.consoleGuard(crossinline block: suspend () -> Obj): Obj {
@@ -338,12 +222,7 @@ private class ObjConsoleEventStream(
 
     companion object {
         val type = net.sergeych.lyng.obj.ObjClass("ConsoleEventStream", ObjIterable).apply {
-            addFnDoc(
+            addFn("iterator") {
-                name = "iterator",
-                doc = "Create an iterator over incoming console events.",
-                returns = type("lyng.Iterator"),
-                moduleName = "lyng.io.console",
-            ) {
                 val stream = thisAs<ObjConsoleEventStream>()
                 ObjConsoleEventIterator(stream.source)
             }
@@ -363,19 +242,36 @@ private class ObjConsoleEventIterator(
     private suspend fun ensureCached(): Boolean {
         if (closed) return false
         if (cached != null) return true
-        val event = source.nextEvent()
+        while (!closed && cached == null) {
+            val event = try {
+                source.nextEvent()
+            } catch (e: Throwable) {
+                // Consumer loops must survive source/read failures: report and keep polling.
+                consoleFlowDebug("console-bridge: nextEvent failed; dropping failure and continuing", e)
+                continue
+            }
             if (event == null) {
                 closeSource()
                 return false
             }
-        cached = event.toObjEvent()
+            cached = try {
-        return true
+                event.toObjEvent()
+            } catch (e: Throwable) {
+                // Malformed/native event payload must not terminate consumer iteration.
+                consoleFlowDebug("console-bridge: malformed event dropped: $event", e)
+                null
+            }
+        }
+        return cached != null
     }
 
     private suspend fun closeSource() {
         if (closed) return
         closed = true
-        source.close()
+        // Do not close the underlying console source from VM iterator cancellation.
+        // CmdFrame.cancelIterators() may call cancelIteration() while user code is still
+        // expected to keep processing input (e.g. recover from app-level exceptions).
+        // The source lifecycle is managed by the console runtime.
     }
 
     suspend fun hasNext(): Boolean = ensureCached()
@@ -391,28 +287,13 @@ private class ObjConsoleEventIterator(
 
     companion object {
         val type = net.sergeych.lyng.obj.ObjClass("ConsoleEventIterator", ObjIterator).apply {
-            addFnDoc(
+            addFn("hasNext") {
-                name = "hasNext",
-                doc = "Whether another console event is available.",
-                returns = type("lyng.Bool"),
-                moduleName = "lyng.io.console",
-            ) {
                 thisAs<ObjConsoleEventIterator>().hasNext().toObj()
             }
-            addFnDoc(
+            addFn("next") {
-                name = "next",
-                doc = "Return the next console event.",
-                returns = type("ConsoleEvent"),
-                moduleName = "lyng.io.console",
-            ) {
                 thisAs<ObjConsoleEventIterator>().next(requireScope())
             }
-            addFnDoc(
+            addFn("cancelIteration") {
-                name = "cancelIteration",
-                doc = "Stop reading console events and release resources.",
-                returns = type("lyng.Void"),
-                moduleName = "lyng.io.console",
-            ) {
                 thisAs<ObjConsoleEventIterator>().closeSource()
                 ObjVoid
             }
@@ -422,27 +303,119 @@ private class ObjConsoleEventIterator(
 
 private fun ConsoleEvent.toObjEvent(): Obj = when (this) {
     is ConsoleEvent.Resize -> ObjConsoleResizeEvent(columns, rows)
-    is ConsoleEvent.KeyDown -> ObjConsoleKeyEvent(type = "keydown", key = key, code = code, ctrl = ctrl, alt = alt, shift = shift, meta = meta)
+    is ConsoleEvent.KeyDown -> ObjConsoleKeyEvent(type = ConsoleEnums.KEY_DOWN, key = sanitizedKeyOrFallback(key), codeName = code, ctrl = ctrl, alt = alt, shift = shift, meta = meta)
-    is ConsoleEvent.KeyUp -> ObjConsoleKeyEvent(type = "keyup", key = key, code = code, ctrl = ctrl, alt = alt, shift = shift, meta = meta)
+    is ConsoleEvent.KeyUp -> ObjConsoleKeyEvent(type = ConsoleEnums.KEY_UP, key = sanitizedKeyOrFallback(key), codeName = code, ctrl = ctrl, alt = alt, shift = shift, meta = meta)
+}
+
+private fun sanitizedKeyOrFallback(key: String): String {
+    if (key.isNotEmpty()) return key
+    consoleFlowDebug("console-bridge: empty key value received; using fallback key name")
+    return "Unknown"
+}
+
+private object ConsoleEnums {
+    lateinit var eventTypeClass: ObjEnumClass
+        private set
+    lateinit var keyCodeClass: ObjEnumClass
+        private set
+    lateinit var ansiLevelClass: ObjEnumClass
+        private set
+
+    private lateinit var eventEntries: Map<String, ObjEnumEntry>
+    private lateinit var keyCodeEntries: Map<String, ObjEnumEntry>
+    private lateinit var ansiLevelEntries: Map<String, ObjEnumEntry>
+
+    val UNKNOWN: ObjEnumEntry get() = event("UNKNOWN")
+    val RESIZE: ObjEnumEntry get() = event("RESIZE")
+    val KEY_DOWN: ObjEnumEntry get() = event("KEY_DOWN")
+    val KEY_UP: ObjEnumEntry get() = event("KEY_UP")
+    val CODE_UNKNOWN: ObjEnumEntry get() = code("UNKNOWN")
+    val CHARACTER: ObjEnumEntry get() = code("CHARACTER")
+
+    fun initialize(module: ModuleScope) {
+        eventTypeClass = resolveEnum(module, "ConsoleEventType")
+        keyCodeClass = resolveEnum(module, "ConsoleKeyCode")
+        ansiLevelClass = resolveEnum(module, "ConsoleAnsiLevel")
+        eventEntries = resolveEntries(
+            eventTypeClass,
+            listOf("UNKNOWN", "RESIZE", "KEY_DOWN", "KEY_UP")
+        )
+        keyCodeEntries = resolveEntries(
+            keyCodeClass,
+            listOf(
+                "UNKNOWN", "CHARACTER", "ARROW_UP", "ARROW_DOWN", "ARROW_LEFT", "ARROW_RIGHT",
+                "HOME", "END", "INSERT", "DELETE", "PAGE_UP", "PAGE_DOWN",
+                "ESCAPE", "ENTER", "TAB", "BACKSPACE", "SPACE"
+            )
+        )
+        ansiLevelEntries = resolveEntries(
+            ansiLevelClass,
+            listOf("NONE", "BASIC16", "ANSI256", "TRUECOLOR")
+        )
+    }
+
+    private fun resolveEnum(module: ModuleScope, enumName: String): ObjEnumClass {
+        val local = module.get(enumName)?.value as? ObjEnumClass
+        if (local != null) return local
+        val root = module.importProvider.rootScope.get(enumName)?.value as? ObjEnumClass
+        return root ?: error("lyng.io.console declaration enum is missing: $enumName")
+    }
+
+    private fun resolveEntries(enumClass: ObjEnumClass, names: List<String>): Map<String, ObjEnumEntry> {
+        return names.associateWith { name ->
+            (enumClass.byName[ObjString(name)] as? ObjEnumEntry)
+                ?: error("lyng.io.console enum entry is missing: ${enumClass.className}.$name")
+        }
+    }
+
+    fun event(name: String): ObjEnumEntry = eventEntries[name]
+        ?: error("lyng.io.console enum entry is missing: ${eventTypeClass.className}.$name")
+
+    fun code(name: String): ObjEnumEntry = keyCodeEntries[name]
+        ?: error("lyng.io.console enum entry is missing: ${keyCodeClass.className}.$name")
+
+    fun ansiLevel(name: String): ObjEnumEntry = ansiLevelEntries[name]
+        ?: error("lyng.io.console enum entry is missing: ${ansiLevelClass.className}.$name")
+}
+
+private val KEY_CODE_BY_KEY_NAME = mapOf(
+    "ArrowUp" to "ARROW_UP",
+    "ArrowDown" to "ARROW_DOWN",
+    "ArrowLeft" to "ARROW_LEFT",
+    "ArrowRight" to "ARROW_RIGHT",
+    "Home" to "HOME",
+    "End" to "END",
+    "Insert" to "INSERT",
+    "Delete" to "DELETE",
+    "PageUp" to "PAGE_UP",
+    "PageDown" to "PAGE_DOWN",
+    "Escape" to "ESCAPE",
+    "Enter" to "ENTER",
+    "Tab" to "TAB",
+    "Backspace" to "BACKSPACE",
+    " " to "SPACE",
+)
+
+private fun codeFrom(key: String, codeName: String?): ObjEnumEntry {
+    val resolved = KEY_CODE_BY_KEY_NAME[codeName ?: key]
+    return when {
+        resolved != null -> ConsoleEnums.code(resolved)
+        key.length == 1 -> ConsoleEnums.CHARACTER
+        else -> ConsoleEnums.CODE_UNKNOWN
+    }
 }
 
 private abstract class ObjConsoleEventBase(
-    private val eventType: String,
+    private val type: ObjEnumEntry,
     final override val objClass: net.sergeych.lyng.obj.ObjClass,
 ) : Obj() {
-    fun eventTypeName(): String = eventType
+    fun type(): ObjEnumEntry = type
 }
 
-private class ObjConsoleEvent : ObjConsoleEventBase("event", type) {
+private class ObjConsoleEvent : ObjConsoleEventBase(ConsoleEnums.UNKNOWN, type) {
     companion object {
         val type = net.sergeych.lyng.obj.ObjClass("ConsoleEvent").apply {
-            addPropertyDoc(
+            addProperty(name = "type", getter = { (this.thisObj as ObjConsoleEventBase).type() })
-                name = "type",
-                doc = "Event type string: resize, keydown, keyup.",
-                type = type("lyng.String"),
-                moduleName = "lyng.io.console",
-                getter = { ObjString((this.thisObj as ObjConsoleEventBase).eventTypeName()) }
-            )
         }
     }
 }
@@ -450,83 +423,40 @@ private class ObjConsoleEvent : ObjConsoleEventBase("event", type) {
 private class ObjConsoleResizeEvent(
     val columns: Int,
     val rows: Int,
-) : ObjConsoleEventBase("resize", type) {
+) : ObjConsoleEventBase(ConsoleEnums.RESIZE, type) {
     companion object {
         val type = net.sergeych.lyng.obj.ObjClass("ConsoleResizeEvent", ObjConsoleEvent.type).apply {
-            addPropertyDoc(
+            addProperty(name = "columns", getter = { (this.thisObj as ObjConsoleResizeEvent).columns.toObj() })
-                name = "columns",
+            addProperty(name = "rows", getter = { (this.thisObj as ObjConsoleResizeEvent).rows.toObj() })
-                doc = "Terminal width in character cells.",
-                type = type("lyng.Int"),
-                moduleName = "lyng.io.console",
-                getter = { (this.thisObj as ObjConsoleResizeEvent).columns.toObj() }
-            )
-            addPropertyDoc(
-                name = "rows",
-                doc = "Terminal height in character cells.",
-                type = type("lyng.Int"),
-                moduleName = "lyng.io.console",
-                getter = { (this.thisObj as ObjConsoleResizeEvent).rows.toObj() }
-            )
         }
     }
 }
 
 private class ObjConsoleKeyEvent(
-    type: String,
+    type: ObjEnumEntry,
     val key: String,
-    val code: String?,
+    val codeName: String?,
     val ctrl: Boolean,
     val alt: Boolean,
     val shift: Boolean,
     val meta: Boolean,
 ) : ObjConsoleEventBase(type, typeObj) {
+    init {
+        require(key.isNotEmpty()) { "ConsoleKeyEvent.key must never be empty" }
+    }
+
     companion object {
         val typeObj = net.sergeych.lyng.obj.ObjClass("ConsoleKeyEvent", ObjConsoleEvent.type).apply {
-            addPropertyDoc(
+            addProperty(name = "key", getter = { ObjString((this.thisObj as ObjConsoleKeyEvent).key) })
-                name = "key",
+            addProperty(name = "code", getter = { codeFrom((this.thisObj as ObjConsoleKeyEvent).key, (this.thisObj as ObjConsoleKeyEvent).codeName) })
-                doc = "Logical key name (e.g. ArrowLeft, a, Escape).",
+            addProperty(name = "codeName", getter = {
-                type = type("lyng.String"),
+                val code = (this.thisObj as ObjConsoleKeyEvent).codeName
-                moduleName = "lyng.io.console",
-                getter = { ObjString((this.thisObj as ObjConsoleKeyEvent).key) }
-            )
-            addPropertyDoc(
-                name = "code",
-                doc = "Optional hardware/code identifier.",
-                type = type("lyng.String", nullable = true),
-                moduleName = "lyng.io.console",
-                getter = {
-                    val code = (this.thisObj as ObjConsoleKeyEvent).code
                 code?.let(::ObjString) ?: ObjNull
-                }
+            })
-            )
+            addProperty(name = "ctrl", getter = { (this.thisObj as ObjConsoleKeyEvent).ctrl.toObj() })
-            addPropertyDoc(
+            addProperty(name = "alt", getter = { (this.thisObj as ObjConsoleKeyEvent).alt.toObj() })
-                name = "ctrl",
+            addProperty(name = "shift", getter = { (this.thisObj as ObjConsoleKeyEvent).shift.toObj() })
-                doc = "Whether Ctrl modifier is pressed.",
+            addProperty(name = "meta", getter = { (this.thisObj as ObjConsoleKeyEvent).meta.toObj() })
-                type = type("lyng.Bool"),
-                moduleName = "lyng.io.console",
-                getter = { (this.thisObj as ObjConsoleKeyEvent).ctrl.toObj() }
-            )
-            addPropertyDoc(
-                name = "alt",
-                doc = "Whether Alt modifier is pressed.",
-                type = type("lyng.Bool"),
-                moduleName = "lyng.io.console",
-                getter = { (this.thisObj as ObjConsoleKeyEvent).alt.toObj() }
-            )
-            addPropertyDoc(
-                name = "shift",
-                doc = "Whether Shift modifier is pressed.",
-                type = type("lyng.Bool"),
-                moduleName = "lyng.io.console",
-                getter = { (this.thisObj as ObjConsoleKeyEvent).shift.toObj() }
-            )
-            addPropertyDoc(
-                name = "meta",
-                doc = "Whether Meta/Super modifier is pressed.",
-                type = type("lyng.Bool"),
-                moduleName = "lyng.io.console",
-                getter = { (this.thisObj as ObjConsoleKeyEvent).meta.toObj() }
-            )
         }
     }
 }
@@ -539,20 +469,8 @@ private class ObjConsoleGeometry(
 
     companion object {
         val type = net.sergeych.lyng.obj.ObjClass("ConsoleGeometry").apply {
-            addPropertyDoc(
+            addProperty(name = "columns", getter = { (this.thisObj as ObjConsoleGeometry).columns.toObj() })
-                name = "columns",
+            addProperty(name = "rows", getter = { (this.thisObj as ObjConsoleGeometry).rows.toObj() })
-                doc = "Terminal width in character cells.",
-                type = type("lyng.Int"),
-                moduleName = "lyng.io.console",
-                getter = { (this.thisObj as ObjConsoleGeometry).columns.toObj() }
-            )
-            addPropertyDoc(
-                name = "rows",
-                doc = "Terminal height in character cells.",
-                type = type("lyng.Int"),
-                moduleName = "lyng.io.console",
-                getter = { (this.thisObj as ObjConsoleGeometry).rows.toObj() }
-            )
         }
     }
 }
@@ -560,41 +478,17 @@ private class ObjConsoleGeometry(
 private class ObjConsoleDetails(
     val supported: Boolean,
     val isTty: Boolean,
-    val ansiLevel: String,
+    val ansiLevel: ObjEnumEntry,
     val geometry: ObjConsoleGeometry?,
 ) : Obj() {
     override val objClass: net.sergeych.lyng.obj.ObjClass get() = type
 
     companion object {
         val type = net.sergeych.lyng.obj.ObjClass("ConsoleDetails").apply {
-            addPropertyDoc(
+            addProperty(name = "supported", getter = { (this.thisObj as ObjConsoleDetails).supported.toObj() })
-                name = "supported",
+            addProperty(name = "isTty", getter = { (this.thisObj as ObjConsoleDetails).isTty.toObj() })
-                doc = "Whether console API is supported.",
+            addProperty(name = "ansiLevel", getter = { (this.thisObj as ObjConsoleDetails).ansiLevel })
-                type = type("lyng.Bool"),
+            addProperty(name = "geometry", getter = { (this.thisObj as ObjConsoleDetails).geometry ?: ObjNull })
-                moduleName = "lyng.io.console",
-                getter = { (this.thisObj as ObjConsoleDetails).supported.toObj() }
-            )
-            addPropertyDoc(
-                name = "isTty",
-                doc = "Whether output is connected to a TTY.",
-                type = type("lyng.Bool"),
-                moduleName = "lyng.io.console",
-                getter = { (this.thisObj as ObjConsoleDetails).isTty.toObj() }
-            )
-            addPropertyDoc(
-                name = "ansiLevel",
-                doc = "Detected ANSI color capability level.",
-                type = type("lyng.String"),
-                moduleName = "lyng.io.console",
-                getter = { ObjString((this.thisObj as ObjConsoleDetails).ansiLevel) }
-            )
-            addPropertyDoc(
-                name = "geometry",
-                doc = "Current terminal geometry or null.",
-                type = type("ConsoleGeometry", nullable = true),
-                moduleName = "lyng.io.console",
-                getter = { (this.thisObj as ObjConsoleDetails).geometry ?: ObjNull }
-            )
         }
     }
 }

lyngio/src/commonMain/kotlin/net/sergeych/lyngio/console/MordantLyngConsole.kt

@@ -100,8 +100,9 @@ object MordantLyngConsole : LyngConsole {
         var running = true
 
         globalLaunch {
-        var lastWidth = t.updateSize().width
+        val initialSize = runCatching { t.updateSize() }.getOrNull()
-        var lastHeight = t.updateSize().height
+        var lastWidth = initialSize?.width ?: 0
+        var lastHeight = initialSize?.height ?: 0
         val startMark = TimeSource.Monotonic.markNow()
         var lastHeartbeatMark = startMark
         var loops = 0L
@@ -113,6 +114,18 @@ object MordantLyngConsole : LyngConsole {
         var lastKeyMark = startMark
         var lastRawRecoveryMark = startMark
 
+        fun tryEmitResize(width: Int, height: Int) {
+            if (width < 1 || height < 1) {
+                consoleFlowDebug("events: ignored invalid resize width=$width height=$height")
+                return
+            }
+            if (width == lastWidth && height == lastHeight) return
+            out.trySend(ConsoleEvent.Resize(width, height))
+            lastWidth = width
+            lastHeight = height
+            resizeEvents += 1
+        }
+
         consoleFlowDebug("events: collector started")
         try {
             while (currentCoroutineContext().isActive && sourceState.withLock { running }) {
@@ -122,12 +135,7 @@ object MordantLyngConsole : LyngConsole {
                     delay(150)
                     continue
                 }
-                if (currentSize.width != lastWidth || currentSize.height != lastHeight) {
+                tryEmitResize(currentSize.width, currentSize.height)
-                    out.trySend(ConsoleEvent.Resize(currentSize.width, currentSize.height))
-                    lastWidth = currentSize.width
-                    lastHeight = currentSize.height
-                    resizeEvents += 1
-                }
 
                 val raw = stateMutex.withLock {
                     if (!rawModeRequested) {
@@ -173,10 +181,8 @@ object MordantLyngConsole : LyngConsole {
                 val ev = readResult.getOrNull()
 
                 val resized = runCatching { t.updateSize() }.getOrNull()
-                if (resized != null && (resized.width != lastWidth || resized.height != lastHeight)) {
+                if (resized != null) {
-                    out.trySend(ConsoleEvent.Resize(resized.width, resized.height))
+                    tryEmitResize(resized.width, resized.height)
-                    lastWidth = resized.width
-                    lastHeight = resized.height
                 }
 
                 when (ev) {

lyngio/src/commonMain/kotlin/net/sergeych/lyngio/docs/ConsoleBuiltinDocs.kt

@@ -17,248 +17,12 @@
 
 package net.sergeych.lyngio.docs
 
-import net.sergeych.lyng.miniast.BuiltinDocRegistry
+/**
-import net.sergeych.lyng.miniast.ParamDoc
+ * Console docs are declared in `lyngio/stdlib/lyng/io/console.lyng`.
-import net.sergeych.lyng.miniast.type
+ * Keep this shim for compatibility with reflective loaders.
-
+ */
 object ConsoleBuiltinDocs {
-    private var registered = false
-
     fun ensure() {
-        if (registered) return
+        // No Kotlin-side doc registration: console.lyng is the source of truth.
-        BuiltinDocRegistry.module("lyng.io.console") {
-            classDoc(
-                name = "Console",
-                doc = "Console runtime API."
-            ) {
-                method(
-                    name = "isSupported",
-                    doc = "Whether console control API is supported on this platform.",
-                    returns = type("lyng.Bool"),
-                    isStatic = true
-                )
-                method(
-                    name = "isTty",
-                    doc = "Whether stdout is attached to an interactive TTY.",
-                    returns = type("lyng.Bool"),
-                    isStatic = true
-                )
-                method(
-                    name = "ansiLevel",
-                    doc = "Detected ANSI color capability: NONE, BASIC16, ANSI256, TRUECOLOR.",
-                    returns = type("lyng.String"),
-                    isStatic = true
-                )
-                method(
-                    name = "geometry",
-                    doc = "Current terminal geometry or null.",
-                    returns = type("ConsoleGeometry", nullable = true),
-                    isStatic = true
-                )
-                method(
-                    name = "details",
-                    doc = "Get consolidated console details.",
-                    returns = type("ConsoleDetails"),
-                    isStatic = true
-                )
-                method(
-                    name = "write",
-                    doc = "Write text directly to console output.",
-                    params = listOf(ParamDoc("text", type("lyng.String"))),
-                    isStatic = true
-                )
-                method(
-                    name = "flush",
-                    doc = "Flush console output buffer.",
-                    isStatic = true
-                )
-                method(
-                    name = "home",
-                    doc = "Move cursor to home position (1,1).",
-                    isStatic = true
-                )
-                method(
-                    name = "clear",
-                    doc = "Clear the visible screen buffer.",
-                    isStatic = true
-                )
-                method(
-                    name = "moveTo",
-                    doc = "Move cursor to 1-based row and column.",
-                    params = listOf(
-                        ParamDoc("row", type("lyng.Int")),
-                        ParamDoc("column", type("lyng.Int")),
-                    ),
-                    isStatic = true
-                )
-                method(
-                    name = "clearLine",
-                    doc = "Clear the current line.",
-                    isStatic = true
-                )
-                method(
-                    name = "enterAltScreen",
-                    doc = "Switch to terminal alternate screen buffer.",
-                    isStatic = true
-                )
-                method(
-                    name = "leaveAltScreen",
-                    doc = "Return from alternate screen buffer to normal screen.",
-                    isStatic = true
-                )
-                method(
-                    name = "setCursorVisible",
-                    doc = "Show or hide the terminal cursor.",
-                    params = listOf(ParamDoc("visible", type("lyng.Bool"))),
-                    isStatic = true
-                )
-                method(
-                    name = "events",
-                    doc = "Endless iterable console event source (resize, keydown, keyup). Use in a loop, often inside launch.",
-                    returns = type("ConsoleEventStream"),
-                    isStatic = true
-                )
-                method(
-                    name = "setRawMode",
-                    doc = "Enable or disable raw keyboard mode. Returns true if mode changed.",
-                    params = listOf(ParamDoc("enabled", type("lyng.Bool"))),
-                    returns = type("lyng.Bool"),
-                    isStatic = true
-                )
-            }
-            classDoc(
-                name = "ConsoleEventStream",
-                doc = "Endless iterable stream of console events."
-            ) {
-                method(
-                    name = "iterator",
-                    doc = "Create an iterator over incoming console events.",
-                    returns = type("lyng.Iterator")
-                )
-            }
-            classDoc(
-                name = "ConsoleGeometry",
-                doc = "Terminal geometry."
-            ) {
-                field(
-                    name = "columns",
-                    doc = "Terminal width in character cells.",
-                    type = type("lyng.Int")
-                )
-                field(
-                    name = "rows",
-                    doc = "Terminal height in character cells.",
-                    type = type("lyng.Int")
-                )
-            }
-            classDoc(
-                name = "ConsoleDetails",
-                doc = "Consolidated console capability details."
-            ) {
-                field(
-                    name = "supported",
-                    doc = "Whether console API is supported.",
-                    type = type("lyng.Bool")
-                )
-                field(
-                    name = "isTty",
-                    doc = "Whether output is attached to a TTY.",
-                    type = type("lyng.Bool")
-                )
-                field(
-                    name = "ansiLevel",
-                    doc = "Detected ANSI color capability.",
-                    type = type("lyng.String")
-                )
-                field(
-                    name = "geometry",
-                    doc = "Current geometry or null.",
-                    type = type("ConsoleGeometry", nullable = true)
-                )
-            }
-            classDoc(
-                name = "ConsoleEvent",
-                doc = "Base class for console events."
-            ) {
-                field(
-                    name = "type",
-                    doc = "Event kind string.",
-                    type = type("lyng.String")
-                )
-            }
-            classDoc(
-                name = "ConsoleResizeEvent",
-                doc = "Resize event."
-            ) {
-                field(
-                    name = "type",
-                    doc = "Event kind string: resize.",
-                    type = type("lyng.String")
-                )
-                field(
-                    name = "columns",
-                    doc = "Terminal width in character cells.",
-                    type = type("lyng.Int")
-                )
-                field(
-                    name = "rows",
-                    doc = "Terminal height in character cells.",
-                    type = type("lyng.Int")
-                )
-            }
-            classDoc(
-                name = "ConsoleKeyEvent",
-                doc = "Keyboard event."
-            ) {
-                field(
-                    name = "type",
-                    doc = "Event kind string: keydown or keyup.",
-                    type = type("lyng.String")
-                )
-                field(
-                    name = "key",
-                    doc = "Logical key name.",
-                    type = type("lyng.String")
-                )
-                field(
-                    name = "code",
-                    doc = "Optional hardware code.",
-                    type = type("lyng.String", nullable = true)
-                )
-                field(
-                    name = "ctrl",
-                    doc = "Ctrl modifier state.",
-                    type = type("lyng.Bool")
-                )
-                field(
-                    name = "alt",
-                    doc = "Alt modifier state.",
-                    type = type("lyng.Bool")
-                )
-                field(
-                    name = "shift",
-                    doc = "Shift modifier state.",
-                    type = type("lyng.Bool")
-                )
-                field(
-                    name = "meta",
-                    doc = "Meta modifier state.",
-                    type = type("lyng.Bool")
-                )
-            }
-
-            valDoc(
-                name = "Console",
-                doc = "Console runtime API.",
-                type = type("Console")
-            )
-            valDoc(name = "ConsoleGeometry", doc = "Terminal geometry class.", type = type("lyng.Class"))
-            valDoc(name = "ConsoleDetails", doc = "Console details class.", type = type("lyng.Class"))
-            valDoc(name = "ConsoleEvent", doc = "Base console event class.", type = type("lyng.Class"))
-            valDoc(name = "ConsoleResizeEvent", doc = "Resize event class.", type = type("lyng.Class"))
-            valDoc(name = "ConsoleKeyEvent", doc = "Keyboard event class.", type = type("lyng.Class"))
-            valDoc(name = "ConsoleEventStream", doc = "Iterable console event stream class.", type = type("lyng.Class"))
-        }
-        registered = true
     }
 }

lyngio/src/jvmMain/kotlin/net/sergeych/lyngio/console/JvmLyngConsole.kt

@@ -26,6 +26,7 @@ import org.jline.terminal.Terminal
 import org.jline.terminal.TerminalBuilder
 import org.jline.utils.NonBlockingReader
 import java.io.EOFException
+import java.io.InterruptedIOException
 import java.util.*
 import java.util.concurrent.atomic.AtomicBoolean
 import java.util.concurrent.atomic.AtomicLong
@@ -41,7 +42,7 @@ import kotlin.time.TimeSource
  *   to avoid dual-terminal contention.
  */
 object JvmLyngConsole : LyngConsole {
-    private const val DEBUG_REVISION = "jline-r26-force-rebuild-on-noop-recovery-2026-03-19"
+    private const val DEBUG_REVISION = "jline-r27-no-close-on-vm-iterator-cancel-2026-03-19"
     private val codeSourceLocation: String by lazy {
         runCatching {
             JvmLyngConsole::class.java.protectionDomain?.codeSource?.location?.toString()
@@ -50,6 +51,44 @@ object JvmLyngConsole : LyngConsole {
 
     private val terminalRef = AtomicReference<Terminal?>(null)
     private val terminalInitLock = Any()
+    private val shutdownHook = Thread(
+        {
+            restoreTerminalStateOnShutdown()
+        },
+        "lyng-console-shutdown"
+    ).apply { isDaemon = true }
+
+    init {
+        runCatching { Runtime.getRuntime().addShutdownHook(shutdownHook) }
+            .onFailure { consoleFlowDebug("jline-events: shutdown hook install failed", it) }
+    }
+
+    private fun restoreTerminalStateOnShutdown() {
+        val term = terminalRef.get() ?: return
+        runCatching {
+            term.writer().print("\u001B[?25h")
+            term.writer().print("\u001B[?1049l")
+            term.writer().flush()
+        }.onFailure {
+            consoleFlowDebug("jline-events: shutdown visual restore failed", it)
+        }
+        val saved = if (runCatching { stateMutex.tryLock() }.getOrNull() == true) {
+            try {
+                rawModeRequested = false
+                val s = rawSavedAttributes
+                rawSavedAttributes = null
+                s
+            } finally {
+                stateMutex.unlock()
+            }
+        } else {
+            null
+        }
+        if (saved != null) {
+            runCatching { term.setAttributes(saved) }
+                .onFailure { consoleFlowDebug("jline-events: shutdown raw attrs restore failed", it) }
+        }
+    }
 
     private fun currentTerminal(): Terminal? {
         val existing = terminalRef.get()
@@ -176,10 +215,29 @@ object JvmLyngConsole : LyngConsole {
         var reader = activeTerm.reader()
         var keyThread: Thread? = null
         var heartbeatThread: Thread? = null
+        val resizeEmitMutex = Any()
+        var lastResizeCols = Int.MIN_VALUE
+        var lastResizeRows = Int.MIN_VALUE
 
         fun emitResize() {
             val size = runCatching { activeTerm.size }.getOrNull() ?: return
-            out.trySend(ConsoleEvent.Resize(size.columns, size.rows))
+            val cols = size.columns
+            val rows = size.rows
+            if (cols < 1 || rows < 1) {
+                consoleFlowDebug("jline-events: ignored invalid resize columns=$cols rows=$rows")
+                return
+            }
+            val shouldEmit = synchronized(resizeEmitMutex) {
+                if (cols == lastResizeCols && rows == lastResizeRows) {
+                    false
+                } else {
+                    lastResizeCols = cols
+                    lastResizeRows = rows
+                    true
+                }
+            }
+            if (!shouldEmit) return
+            out.trySend(ConsoleEvent.Resize(cols, rows))
         }
 
         fun cleanup() {
@@ -270,13 +328,13 @@ object JvmLyngConsole : LyngConsole {
                             .onFailure { consoleFlowDebug("jline-events: reader shutdown failed during recovery", it) }
 
                         reader = activeTerm.reader()
-                        if (reader.hashCode() == prevReader.hashCode()) {
+                        if (reader === prevReader) {
-                            consoleFlowDebug("jline-events: reader recovery no-op oldReader=${prevReader.hashCode()} newReader=${reader.hashCode()} -> forcing terminal rebuild")
+                            consoleFlowDebug("jline-events: reader recovery no-op oldReader=${System.identityHashCode(prevReader)} newReader=${System.identityHashCode(reader)} -> forcing terminal rebuild")
                             if (!tryRebuildTerminal()) {
                                 consoleFlowDebug("jline-events: forced terminal rebuild did not produce a new reader")
                             }
                         } else {
-                            consoleFlowDebug("jline-events: reader recovered oldReader=${prevReader.hashCode()} newReader=${reader.hashCode()}")
+                            consoleFlowDebug("jline-events: reader recovered oldReader=${System.identityHashCode(prevReader)} newReader=${System.identityHashCode(reader)}")
                         }
 
                         readerRecoveries.incrementAndGet()
@@ -305,18 +363,56 @@ object JvmLyngConsole : LyngConsole {
                     } else {
                         keySendFailures.incrementAndGet()
                     }
-                } catch (_: InterruptedException) {
+                } catch (e: InterruptedException) {
-                    break
+                    // Keep input alive if this is a transient interrupt while still running.
+                    if (!running.get() || !keyLoopRunning.get()) break
+                    recoveryRequested.set(true)
+                    consoleFlowDebug("jline-events: key-reader interrupted; scheduling reader recovery", e)
+                    Thread.interrupted()
+                    continue
+                } catch (e: InterruptedIOException) {
+                    // Common during reader shutdown/rebind. Recover silently and keep input flowing.
+                    if (!running.get() || !keyLoopRunning.get()) break
+                    recoveryRequested.set(true)
+                    consoleFlowDebug("jline-events: read interrupted; scheduling reader recovery", e)
+                    try {
+                        Thread.sleep(10)
+                    } catch (ie: InterruptedException) {
+                        if (!running.get() || !keyLoopRunning.get()) break
+                        recoveryRequested.set(true)
+                        consoleFlowDebug("jline-events: interrupted during recovery backoff; continuing", ie)
+                        Thread.interrupted()
+                    }
+                } catch (e: EOFException) {
+                    // EOF from reader should trigger rebind/rebuild rather than ending input stream.
+                    if (!running.get() || !keyLoopRunning.get()) break
+                    recoveryRequested.set(true)
+                    consoleFlowDebug("jline-events: reader EOF; scheduling reader recovery", e)
+                    try {
+                        Thread.sleep(20)
+                    } catch (ie: InterruptedException) {
+                        if (!running.get() || !keyLoopRunning.get()) break
+                        recoveryRequested.set(true)
+                        consoleFlowDebug("jline-events: interrupted during EOF backoff; continuing", ie)
+                        Thread.interrupted()
+                    }
                 } catch (e: Throwable) {
                     readFailures.incrementAndGet()
+                    recoveryRequested.set(true)
                     consoleFlowDebug("jline-events: blocking read failed", e)
                     try {
                         Thread.sleep(50)
-                    } catch (_: InterruptedException) {
+                    } catch (ie: InterruptedException) {
-                        break
+                        if (!running.get() || !keyLoopRunning.get()) break
+                        recoveryRequested.set(true)
+                        consoleFlowDebug("jline-events: interrupted during error backoff; continuing", ie)
+                        Thread.interrupted()
                     }
                 }
             }
+            consoleFlowDebug(
+                "jline-events: key-reader thread stopped running=${running.get()} keyLoopRunning=${keyLoopRunning.get()} loops=${keyLoopCount.get()} keys=${keyEvents.get()} readFailures=${readFailures.get()}"
+            )
         }
 
         heartbeatThread = thread(start = true, isDaemon = true, name = "lyng-jline-heartbeat") {
@@ -334,13 +430,19 @@ object JvmLyngConsole : LyngConsole {
                     val readBlockedMs = if (readStartNs > 0L && readEndNs < readStartNs) {
                         (System.nanoTime() - readStartNs) / 1_000_000L
                     } else 0L
-                    if (requested && keyCodesRead.get() > 0L && idleMs >= 1400L) {
+                    val streamIdle = requested && keyCodesRead.get() > 0L && idleMs >= 1400L
+                    val readStalled = requested && readBlockedMs >= 1600L
+                    if (streamIdle || readStalled) {
                         val sinceRecoveryMs = (System.nanoTime() - lastRecoveryNs.get()) / 1_000_000L
                         if (sinceRecoveryMs >= 1200L) {
                             recoveryRequested.set(true)
+                            if (readStalled) {
+                                consoleFlowDebug("jline-events: key read blocked ${readBlockedMs}ms; scheduling reader recovery")
+                            } else {
                                 consoleFlowDebug("jline-events: key stream idle ${idleMs}ms; scheduling reader recovery")
                             }
                         }
+                    }
                     consoleFlowDebug(
                         "jline-events: heartbeat keyCodes=${keyCodesRead.get()} keysSent=${keyEvents.get()} sendFailures=${keySendFailures.get()} readFailures=${readFailures.get()} recoveries=${readerRecoveries.get()} rawRequested=$requested keyLoop=${keyLoopCount.get()} readBlockedMs=$readBlockedMs keyIdleMs=$idleMs keyPath=reader"
                     )
@@ -366,6 +468,7 @@ object JvmLyngConsole : LyngConsole {
             }
 
             override suspend fun close() {
+                consoleFlowDebug("jline-events: collector close requested", Throwable("collector close caller"))
                 cleanup()
                 consoleFlowDebug(
                     "jline-events: collector ended keys=${keyEvents.get()} readFailures=${readFailures.get()}"
@@ -485,7 +588,9 @@ object JvmLyngConsole : LyngConsole {
         ctrl: Boolean = false,
         alt: Boolean = false,
         shift: Boolean = false,
-    ): ConsoleEvent.KeyDown = ConsoleEvent.KeyDown(
+    ): ConsoleEvent.KeyDown {
+        require(value.isNotEmpty()) { "ConsoleEvent.KeyDown.key must never be empty" }
+        return ConsoleEvent.KeyDown(
             key = value,
             code = null,
             ctrl = ctrl,
@@ -493,4 +598,5 @@ object JvmLyngConsole : LyngConsole {
             shift = shift,
             meta = false
         )
+    }
 }

lyngio/src/jvmTest/kotlin/net/sergeych/lyng/io/console/LyngConsoleModuleTest.kt

@@ -56,7 +56,7 @@ class LyngConsoleModuleTest {
             val d = Console.details()
             assert(d.supported is Bool)
             assert(d.isTty is Bool)
-            assert(d.ansiLevel is String)
+            assert(d.ansiLevel is ConsoleAnsiLevel)
 
             val g = Console.geometry()
             if (g != null) {

lyngio/stdlib/lyng/io/console.lyng

@@ -0,0 +1,157 @@
+package lyng.io.console
+
+/* Console event kinds used by `ConsoleEvent.type`. */
+enum ConsoleEventType {
+    UNKNOWN,
+    RESIZE,
+    KEY_DOWN,
+    KEY_UP
+}
+
+/* Normalized key codes used by `ConsoleKeyEvent.code`. */
+enum ConsoleKeyCode {
+    UNKNOWN,
+    CHARACTER,
+    ARROW_UP,
+    ARROW_DOWN,
+    ARROW_LEFT,
+    ARROW_RIGHT,
+    HOME,
+    END,
+    INSERT,
+    DELETE,
+    PAGE_UP,
+    PAGE_DOWN,
+    ESCAPE,
+    ENTER,
+    TAB,
+    BACKSPACE,
+    SPACE
+}
+
+/* Detected ANSI terminal capability level. */
+enum ConsoleAnsiLevel {
+    NONE,
+    BASIC16,
+    ANSI256,
+    TRUECOLOR
+}
+
+/* Base class for console events. */
+extern class ConsoleEvent {
+    /* Event kind for stable matching/switching. */
+    val type: ConsoleEventType
+}
+
+/* Terminal resize event. */
+extern class ConsoleResizeEvent : ConsoleEvent {
+    /* Current terminal width in character cells. */
+    val columns: Int
+    /* Current terminal height in character cells. */
+    val rows: Int
+}
+
+/* Keyboard event. */
+extern class ConsoleKeyEvent : ConsoleEvent {
+    /*
+        Logical key name normalized for app-level handling, for example:
+        "a", "A", "ArrowLeft", "Escape", "Enter".
+    */
+    val key: String
+    /* Normalized key code enum for robust matching independent of backend specifics. */
+    val code: ConsoleKeyCode
+    /*
+        Optional backend-specific raw identifier (if available).
+        Not guaranteed to be present or stable across platforms.
+    */
+    val codeName: String?
+    /* True when Ctrl was pressed during the key event. */
+    val ctrl: Bool
+    /* True when Alt/Option was pressed during the key event. */
+    val alt: Bool
+    /* True when Shift was pressed during the key event. */
+    val shift: Bool
+    /* True when Meta/Super/Command was pressed during the key event. */
+    val meta: Bool
+}
+
+/* Pull iterator over console events. */
+extern class ConsoleEventIterator : Iterator<ConsoleEvent> {
+    /* Whether another event is currently available from the stream. */
+    override fun hasNext(): Bool
+    /* Returns next event or throws iteration-finished when exhausted/cancelled. */
+    override fun next(): ConsoleEvent
+    /* Stops this iterator. The underlying console service remains managed by runtime. */
+    override fun cancelIteration(): void
+}
+
+/* Endless iterable console event stream. */
+extern class ConsoleEventStream : Iterable<ConsoleEvent> {
+    /* Creates a fresh event iterator bound to the current console input stream. */
+    override fun iterator(): ConsoleEventIterator
+}
+
+/* Terminal geometry in character cells. */
+extern class ConsoleGeometry {
+    val columns: Int
+    val rows: Int
+}
+
+/* Snapshot of console support/capabilities. */
+extern class ConsoleDetails {
+    /* True when current runtime has console control implementation. */
+    val supported: Bool
+    /* True when output/input are attached to an interactive terminal. */
+    val isTty: Bool
+    /* Detected terminal color capability level. */
+    val ansiLevel: ConsoleAnsiLevel
+    /* Current terminal size if available, otherwise null. */
+    val geometry: ConsoleGeometry?
+}
+
+/* Console API singleton object. */
+extern object Console {
+    /* Returns true when console control API is implemented in this runtime. */
+    fun isSupported(): Bool
+    /* Returns true when process is attached to interactive TTY. */
+    fun isTty(): Bool
+    /* Returns detected color capability level. */
+    fun ansiLevel(): ConsoleAnsiLevel
+    /* Returns current terminal geometry, or null when unavailable. */
+    fun geometry(): ConsoleGeometry?
+    /* Returns combined capability snapshot in one call. */
+    fun details(): ConsoleDetails
+
+    /* Writes raw text to console output buffer (no implicit newline). */
+    fun write(text: String): void
+    /* Flushes pending console output. Call after batched writes. */
+    fun flush(): void
+
+    /* Moves cursor to home position (row 1, column 1). */
+    fun home(): void
+    /* Clears visible screen buffer. Cursor position is backend-dependent after clear. */
+    fun clear(): void
+    /* Moves cursor to 1-based row/column. Values outside viewport are backend-defined. */
+    fun moveTo(row: Int, column: Int): void
+    /* Clears current line content. Cursor stays on the same line. */
+    fun clearLine(): void
+
+    /* Switches terminal into alternate screen buffer (useful for TUIs). */
+    fun enterAltScreen(): void
+    /* Returns from alternate screen buffer to the normal terminal screen. */
+    fun leaveAltScreen(): void
+    /* Shows or hides the cursor. Prefer restoring visibility in finally blocks. */
+    fun setCursorVisible(visible: Bool): void
+
+    /*
+        Returns endless event stream (resize + key events).
+        Typical usage is consuming in a launched loop.
+    */
+    fun events(): ConsoleEventStream
+
+    /*
+        Enables/disables raw keyboard mode.
+        Returns true when state was actually changed.
+    */
+    fun setRawMode(enabled: Bool): Bool
+}

lynglib/build.gradle.kts

@@ -21,7 +21,7 @@ import org.jetbrains.kotlin.gradle.ExperimentalWasmDsl
 import org.jetbrains.kotlin.gradle.dsl.JvmTarget
 
 group = "net.sergeych"
-version = "1.5.0-RC"
+version = "1.5.1"
 
 // Removed legacy buildscript classpath declarations; plugins are applied via the plugins DSL below
 

lynglib/src/commonMain/kotlin/net/sergeych/lyng/Parser.kt

@@ -26,7 +26,10 @@ val idNextChars = { d: Char -> d.isLetter() || d == '_' || d.isDigit() || d == '
 val idFirstChars = { d: Char -> d.isLetter() || d == '_' || d == '$' }
 
 fun parseLyng(source: Source): List<Token> {
-    val p = Parser(fromPos = source.startPos)
+    val p = Parser(
+        fromPos = source.startPos,
+        interpolationEnabled = detectInterpolationEnabled(source.text)
+    )
     val tokens = mutableListOf<Token>()
     do {
         val t = p.nextToken()
@@ -35,9 +38,70 @@ fun parseLyng(source: Source): List<Token> {
     return tokens
 }
 
-private class Parser(fromPos: Pos) {
+private fun parseLyng(source: Source, interpolationEnabled: Boolean): List<Token> {
+    val p = Parser(
+        fromPos = source.startPos,
+        interpolationEnabled = interpolationEnabled
+    )
+    val tokens = mutableListOf<Token>()
+    do {
+        val t = p.nextToken()
+        tokens += t
+    } while (t.type != Token.Type.EOF)
+    return tokens
+}
+
+private fun detectInterpolationEnabled(text: String): Boolean {
+    // Per-file feature switch in leading comments:
+    //   // feature: interpolation: off
+    //   // feature: interpolation: on
+    var enabled = true
+    val lines = text.split('\n')
+    var i = 0
+    while (i < lines.size) {
+        val line = lines[i]
+        val trimmed = line.trim()
+        if (trimmed.isBlank()) {
+            i++
+            continue
+        }
+        if (i == 0 && trimmed.startsWith("#!")) {
+            i++
+            continue
+        }
+        if (trimmed.startsWith("//")) {
+            val m = Regex("^//\\s*feature\\s*:\\s*interpolation\\s*:\\s*(on|off)\\s*$", RegexOption.IGNORE_CASE)
+                .matchEntire(trimmed)
+            if (m != null) {
+                enabled = m.groupValues[1].equals("on", ignoreCase = true)
+            }
+            i++
+            continue
+        }
+        if (trimmed.startsWith("/*")) {
+            // Skip leading block comment(s); directives are intentionally line-comment based.
+            var j = i
+            var closed = false
+            while (j < lines.size) {
+                if (lines[j].contains("*/")) {
+                    closed = true
+                    break
+                }
+                j++
+            }
+            if (!closed) break
+            i = j + 1
+            continue
+        }
+        break
+    }
+    return enabled
+}
+
+private class Parser(fromPos: Pos, private val interpolationEnabled: Boolean = true) {
 
     private val pos = MutablePos(fromPos)
+    private val bufferedTokens = ArrayDeque<Token>()
 
     /**
      * Immutable copy of current position
@@ -47,6 +111,7 @@ private class Parser(fromPos: Pos) {
     private fun raise(msg: String): Nothing = throw ScriptError(currentPos, msg)
 
     fun nextToken(): Token {
+        if (bufferedTokens.isNotEmpty()) return bufferedTokens.removeFirst()
         skipws()
         if (pos.end) return Token("", currentPos, Token.Type.EOF)
         val from = currentPos
@@ -296,7 +361,7 @@ private class Parser(fromPos: Pos) {
                     Token(":", from, Token.Type.COLON)
             }
 
-            '"' -> loadStringToken()
+            '"' -> loadStringTokens(from)
 
             in digitsSet -> {
                 pos.back()
@@ -485,11 +550,6 @@ private class Parser(fromPos: Pos) {
 
     private fun loadStringToken(): Token {
         val start = currentPos
-
-//        if (currentChar == '"') pos.advance()
-//        else start = start.back()
-//        start = start.back()
-
         val sb = StringBuilder()
         var newlineDetected = false
         while (currentChar != '"') {
@@ -548,6 +608,262 @@ private class Parser(fromPos: Pos) {
         return Token(result, start, Token.Type.STRING)
     }
 
+    private sealed interface StringChunk {
+        data class Literal(val text: String, val pos: Pos) : StringChunk
+        data class Expr(val tokens: List<Token>, val pos: Pos) : StringChunk
+    }
+
+    private fun loadStringTokens(startQuotePos: Pos): Token {
+        if (!interpolationEnabled) return loadStringToken()
+        val tokenPos = currentPos
+
+        val chunks = mutableListOf<StringChunk>()
+        val literal = StringBuilder()
+        var newlineDetected = false
+        var hasInterpolation = false
+
+        fun flushLiteralChunk() {
+            if (literal.isNotEmpty()) {
+                chunks += StringChunk.Literal(literal.toString(), tokenPos)
+                literal.clear()
+            }
+        }
+
+        while (currentChar != '"') {
+            if (pos.end) throw ScriptError(startQuotePos, "unterminated string started there")
+            when (currentChar) {
+                '\\' -> {
+                    pos.advance() ?: raise("unterminated string")
+                    when (currentChar) {
+                        'n' -> {
+                            literal.append('\n'); pos.advance()
+                        }
+
+                        'r' -> {
+                            literal.append('\r'); pos.advance()
+                        }
+
+                        't' -> {
+                            literal.append('\t'); pos.advance()
+                        }
+
+                        '"' -> {
+                            literal.append('"'); pos.advance()
+                        }
+
+                        '\\' -> {
+                            literal.append('\\'); pos.advance()
+                        }
+
+                        'u' -> {
+                            literal.append(loadUnicodeEscape(tokenPos))
+                        }
+
+                        '$' -> {
+                            // Backslash-escaped dollar is always literal.
+                            literal.append('$')
+                            pos.advance()
+                        }
+
+                        else -> {
+                            literal.append('\\').append(currentChar)
+                            pos.advance()
+                        }
+                    }
+                }
+
+                '$' -> {
+                    pos.advance()
+                    when {
+                        currentChar == '$' -> {
+                            // $$ -> literal '$'
+                            literal.append('$')
+                            pos.advance()
+                        }
+
+                        currentChar == '{' -> {
+                            hasInterpolation = true
+                            flushLiteralChunk()
+                            val exprStart = pos.toPos()
+                            pos.advance() // consume '{'
+                            val exprText = readInterpolationExprText(startQuotePos)
+                            val exprTokens = parseEmbeddedExpressionTokens(exprText, exprStart)
+                            chunks += StringChunk.Expr(exprTokens, exprStart)
+                        }
+
+                        idFirstChars(currentChar) -> {
+                            hasInterpolation = true
+                            flushLiteralChunk()
+                            val idPos = pos.toPos()
+                            val id = loadChars(idNextChars)
+                            val idToken = Token(id, idPos, Token.Type.ID)
+                            chunks += StringChunk.Expr(listOf(idToken), idPos)
+                        }
+
+                        else -> {
+                            // Bare '$' before non-interpolation text stays literal.
+                            literal.append('$')
+                        }
+                    }
+                }
+
+                '\n', '\r' -> {
+                    newlineDetected = true
+                    literal.append(currentChar)
+                    pos.advance()
+                }
+
+                else -> {
+                    literal.append(currentChar)
+                    pos.advance()
+                }
+            }
+        }
+        pos.advance() // closing quote
+
+        if (!hasInterpolation) {
+            val result = literal.toString().let { if (newlineDetected) fixMultilineStringLiteral(it) else it }
+            return Token(result, tokenPos, Token.Type.STRING)
+        }
+
+        flushLiteralChunk()
+        if (chunks.isEmpty()) {
+            return Token("", tokenPos, Token.Type.STRING)
+        }
+        val expanded = mutableListOf<Token>()
+        expanded += Token("(", tokenPos, Token.Type.LPAREN)
+        var emittedPieces = 0
+        for (chunk in chunks) {
+            val pieceTokens = when (chunk) {
+                is StringChunk.Literal -> {
+                    if (chunk.text.isEmpty()) emptyList()
+                    else listOf(Token(chunk.text, chunk.pos, Token.Type.STRING))
+                }
+                is StringChunk.Expr -> {
+                    if (chunk.tokens.isEmpty()) throw ScriptError(chunk.pos, "empty interpolation expression")
+                    if (chunk.tokens.size == 1) {
+                        chunk.tokens
+                    } else {
+                        listOf(Token("(", chunk.pos, Token.Type.LPAREN)) +
+                            chunk.tokens +
+                            listOf(Token(")", chunk.pos, Token.Type.RPAREN))
+                    }
+                }
+            }
+            if (pieceTokens.isEmpty()) continue
+            if (emittedPieces > 0) expanded += Token("+", tokenPos, Token.Type.PLUS)
+            expanded += pieceTokens
+            emittedPieces++
+        }
+        if (emittedPieces == 0) {
+            expanded += Token("", tokenPos, Token.Type.STRING)
+        }
+        expanded += Token(")", tokenPos, Token.Type.RPAREN)
+
+        val first = expanded.first()
+        for (i in 1 until expanded.size) bufferedTokens.addLast(expanded[i])
+        return first
+    }
+
+    private fun parseEmbeddedExpressionTokens(text: String, exprPos: Pos): List<Token> {
+        val tokens = parseLyng(Source(exprPos.source.fileName, text), interpolationEnabled)
+        if (tokens.isEmpty()) return emptyList()
+        val withoutEof = if (tokens.last().type == Token.Type.EOF) tokens.dropLast(1) else tokens
+        return withoutEof
+    }
+
+    private fun readInterpolationExprText(start: Pos): String {
+        val out = StringBuilder()
+        var depth = 1
+        while (!pos.end) {
+            val ch = currentChar
+            if (ch == '"') {
+                appendQuoted(out, '"')
+                continue
+            }
+            if (ch == '\'') {
+                appendQuoted(out, '\'')
+                continue
+            }
+            if (ch == '/' && peekChar() == '/') {
+                out.append('/').append('/')
+                pos.advance()
+                pos.advance()
+                while (!pos.end && currentChar != '\n') {
+                    out.append(currentChar)
+                    pos.advance()
+                }
+                continue
+            }
+            if (ch == '/' && peekChar() == '*') {
+                out.append('/').append('*')
+                pos.advance()
+                pos.advance()
+                var closed = false
+                while (!pos.end) {
+                    val c = currentChar
+                    if (c == '*' && peekChar() == '/') {
+                        out.append('*').append('/')
+                        pos.advance()
+                        pos.advance()
+                        closed = true
+                        break
+                    }
+                    out.append(c)
+                    pos.advance()
+                }
+                if (!closed) throw ScriptError(start, "unterminated block comment in interpolation")
+                continue
+            }
+            if (ch == '{') {
+                depth++
+                out.append(ch)
+                pos.advance()
+                continue
+            }
+            if (ch == '}') {
+                depth--
+                if (depth == 0) {
+                    pos.advance() // consume closing '}'
+                    return out.toString()
+                }
+                out.append(ch)
+                pos.advance()
+                continue
+            }
+            out.append(ch)
+            pos.advance()
+        }
+        throw ScriptError(start, "unterminated interpolation expression")
+    }
+
+    private fun appendQuoted(out: StringBuilder, quote: Char) {
+        out.append(quote)
+        pos.advance()
+        while (!pos.end) {
+            val c = currentChar
+            out.append(c)
+            pos.advance()
+            if (c == '\\') {
+                if (!pos.end) {
+                    out.append(currentChar)
+                    pos.advance()
+                }
+                continue
+            }
+            if (c == quote) return
+        }
+    }
+
+    private fun peekChar(): Char {
+        if (pos.end) return 0.toChar()
+        val mark = pos.toPos()
+        pos.advance()
+        val result = currentChar
+        pos.resetTo(mark)
+        return result
+    }
+
     private fun loadUnicodeEscape(start: Pos): Char {
         // Called when currentChar points to 'u' right after a backslash.
         if (currentChar != 'u') throw ScriptError(currentPos, "expected unicode escape marker: u")

lynglib/src/commonTest/kotlin/ObjectExpressionTest.kt

@@ -114,7 +114,7 @@ class ObjectExpressionTest {
         eval("""
             val x = object { }
             val name = ((x::class as Class).className as String)
-            assert(name.startsWith("${'$'}Anon_"))
+            assert(name.startsWith("\${'$'}Anon_"))
         """.trimIndent())
     }
 }

lynglib/src/commonTest/kotlin/ScriptTest.kt

@@ -4194,26 +4194,43 @@ class ScriptTest {
 //    }
 
 
-//    @Ignore
+    @Test
-//    @Test
+    fun interpolationTest() = runTest {
-//    fun interpolationTest() = runTest {
+        val d = '$'
-//        eval($$$"""
+        eval(
-//
+            """
-//            val foo = "bar"
+            val foo = "bar"
-//            val buzz = ["foo", "bar"]
+            val buzz = ["foo", "bar"]
-//
+
-//            // 1. simple interpolation
+            // 1. simple interpolation
-//            assertEquals( "bar", "$foo" )
+            assertEquals("bar", "${d}foo")
-//            assertEquals( "bar", "${foo}" )
+            assertEquals("bar", "${d}{foo}")
-//
+
-//            // 2. escaping the dollar sign
+            // 2. escaping / literal dollar forms
-//            assertEquals( "$", "\$foo"[0] )
+            assertEquals("${d}${d}foo", "\${d}foo")
-//            assertEquals( "foo, "\$foo"[1..] )
+            assertEquals("${d}${d}foo", "${d}${d}foo")
-//
+            assertEquals("\\bar", "\\${d}foo")
-//            // 3. interpolation with expression
+
-//            assertEquals( "foo!. bar?", "${buzz[0]+"!"}. ${buzz[1]+"?"}" )
+            // 3. interpolation with expression
-//        """.trimIndent())
+            assertEquals("foo!. bar?", "${d}{buzz[0] + "!"}. ${d}{buzz[1] + "?"}")
-//    }
+        """.trimIndent()
+        )
+    }
+
+    @Test
+    fun interpolationCanBeDisabledByFeatureComment() = runTest {
+        val d = '$'
+        eval(
+            """
+            // feature: interpolation: off
+            val name = "lyng"
+            assertEquals("hello, ${d}name!", "hello, ${d}name!")
+            assertEquals("${d}{name}", "${d}{name}")
+            assertEquals("${d}${d}name", "${d}${d}name")
+            assertEquals("\\${d}name", "\\${d}name")
+        """.trimIndent()
+        )
+    }
 
     @Test
     fun testInlineArrayLiteral() = runTest {

lynglib/stdlib/lyng/root.lyng

@@ -81,6 +81,7 @@ extern fun abs(x: Object): Real
 extern fun ln(x: Object): Real
 extern fun pow(x: Object, y: Object): Real
 extern fun sqrt(x: Object): Real
+extern fun clamp<T>(value: T, range: Range<T>): T
 
 class SeededRandom {
     extern fun nextInt(): Int

site/src/jsMain/resources/index.html

@@ -339,7 +339,7 @@
 <!-- Top-left version ribbon -->
 <div class="corner-ribbon bg-danger text-white">
         <span style="margin-left: -5em">
-            v1.5.0-RC
+            v1.5.1
         </span>
 </div>
 <!-- Fixed top navbar for the whole site -->

work_documents/lyng_as_common_platform.md

@@ -0,0 +1,189 @@
+# Lyng as a Common Platform for Smart Contracts and Distributed Execution
+
+## Executive Summary
+
+This proposal describes Lyng as a shared execution layer for:
+
+- smart contracts across different blockchain networks,
+- distributed compute workflows,
+- decentralized application logic.
+
+The goal is simple: write business logic once in Lyng, then run it consistently across chains, trusted execution nodes, and off-chain workers.
+
+## Why a Common Lyng Layer
+
+A unified language and runtime reduces fragmentation between contract code, off-chain services, and automation scripts.
+
+Key benefits:
+
+- One language across environments: the same Lyng code can be reused in contracts, validators, and distributed tasks.
+- Capability-safe by default: no filesystem, process, or host access unless explicitly exposed by the host platform.
+- Async-first execution model: lightweight concurrent tasks are natural, and host runtimes can schedule them efficiently.
+- Strong typing with inference: concise source code without sacrificing type safety.
+- Deterministic execution options: instruction/gas counting can be enabled for metered environments.
+- Broad platform support: JVM, JS/Wasm, and native targets enable consistent tooling and deployment.
+
+## Where It Fits
+
+Lyng is a strong fit for:
+
+- contract logic that must also run in simulation or off-chain verification,
+- distributed orchestration and rule-based automations,
+- cross-network shared libraries (validation, accounting rules, policy checks),
+- deterministic business logic that should be portable between operators.
+
+## Proposed Architecture
+
+1. **Primary runtime**: Lyng VM/JIT for high-throughput trusted execution.
+2. **Metered runtime**: Lyng VM mode with instruction counting and gas limits for blockchain execution.
+3. **Standard API surface**:
+   - core Lyng standard library,
+   - storage contract (`key/value/tags`) shared across network adapters.
+4. **Developer sandbox**:
+   - local deterministic sandbox for test/debug,
+   - optional feature-rich sandbox profile for integration testing.
+
+## Strong Parts of the Lyng Approach
+
+- **Code portability**: contract logic and off-chain logic remain aligned.
+- **Lower maintenance**: fewer language/runtime rewrites across components.
+- **Faster onboarding**: modern, readable syntax and concise constructs.
+- **Safer host integration**: explicit capability injection limits accidental exposure.
+- **Operational flexibility**: same package can run in metered or non-metered mode.
+
+## Example: Deterministic Ledger Transfer
+
+```lyng
+class Ledger(storage) {
+    fun transfer(from: Int, to: Int, amount: Int) {
+        require(amount > 0)
+
+        val fromKey = "bal:$from"
+        val toKey = "bal:$to"
+
+        val fromBal = storage[fromKey] ?: 0
+        require(fromBal >= amount)
+
+        storage[fromKey] = fromBal - amount
+        storage[toKey] = (storage[toKey] ?: 0) + amount
+    }
+}
+```
+
+The same logic can run:
+
+- in a gas-metered contract runtime,
+- in off-chain simulation,
+- in distributed batch reconciliation.
+
+## Example: Parallel Verification Workflow
+
+```lyng
+fun verifyBatch(items, verifier) {
+    val jobs = []
+
+    for (item in items) {
+        jobs += launch { verifier(item) }
+    }
+
+    val results = []
+    for (job in jobs) {
+        results += await(job)
+    }
+
+    results
+}
+```
+
+This model is useful for distributed validation, scoring, and pre-consensus checks.
+
+## Feature Showcases
+
+### 1. Runtime generics with bounds (non-erased behavior)
+
+```lyng
+fun square<T: Int | Real>(x: T) = x * x
+
+fun describeValue<T: Int | Real>(x: T): String = when (T) {
+    Int -> "Int value=$x"
+    Real -> "Real value=$x"
+    else -> "Numeric value=$x"
+}
+
+fun sameType<T>(x: T, y: Object): Bool = y is T
+```
+
+This enables practical runtime type-aware logic in generic code without JVM-style erasure limitations.
+
+### 2. Multiple inheritance with lifted enums
+
+```lyng
+class Payable(val accountId: Int) {
+    fun channel() = "onchain"
+}
+
+class Audited {
+    fun mark() = "audited"
+}
+
+class Payment(accountId: Int) : Payable(accountId), Audited() {
+    enum Status* { Pending, Settled }
+}
+
+val p = Payment(42)
+assertEquals("onchain", p.channel())
+assertEquals("audited", p.mark())
+assertEquals(Payment.Pending, Payment.Status.Pending)
+```
+
+This combines reusable behavior composition with concise domain modeling.
+
+### 3. Unified delegation model (`val`, `var`, `fun`)
+
+```lyng
+val state = { "owner": "alice", "limit": 10 }
+
+val owner by state
+var limit by state
+
+object RpcDelegate {
+    fun invoke(thisRef, name, args...) = "$name:${args.size}"
+}
+fun remoteCall by RpcDelegate
+
+limit = 25
+assertEquals(25, state["limit"])
+assertEquals("remoteCall:2", remoteCall("alice", 10))
+```
+
+Delegation helps build compact, extensible models with minimal boilerplate.
+
+## Rollout Strategy
+
+1. Define the minimal portable storage API (`get/put/find by tags`) as a stable contract.
+2. Publish a compatibility profile for metered execution (determinism + gas accounting).
+3. Provide chain adapters that map Lyng storage/API calls to each target network.
+4. Ship a reference sandbox and conformance tests for runtime parity.
+5. Build shared Lyng libraries for common contract and compute patterns.
+6. Launch a Lyng package manager and registry (NPM/Maven-style) with first-class support for unified scripts:
+   - package metadata for runtime profile (metered/off-chain), storage API version, and capability requirements,
+   - deterministic dependency resolution and lockfiles,
+   - signed package publishing and verification for supply-chain integrity.
+
+## Existing Resources
+
+- Lyng project repository: https://github.com/sergeych/lyng
+- Lyng docs home: https://lynglang.com
+- Lyng tutorial: https://lynglang.com/#/docs/tutorial.md
+- Embedding Lyng: https://lynglang.com/#/docs/embedding.md
+
+## Conclusion
+
+Lyng can serve as a practical common platform for blockchain contracts and distributed execution by combining:
+
+- portable language semantics,
+- safe-by-default host interaction,
+- metered deterministic execution when required,
+- and reusable code across on-chain and off-chain environments.
+
+This reduces duplication, improves consistency, and shortens delivery cycles for decentralized systems.