JSLike, a CSP-Safe Interpreter for JS, TS, JSX, TSX in JS releases

Fixed

• Support super.method() inside arrow-function class fields on derived classes.
• Bind super for prototype methods and class field initializers to parent prototype members with the derived instance as receiver.
• Cover computed super[...]() calls, async parent methods, multi-level inheritance chains, and constructor super(...) compatibility.

Verification

• npm run build passed. Existing wang-prism CommonJS warning remains unchanged.
• npm test: 54 passed, 1359 passed | 4 skipped.
• Issue #13 repro returns base.
• npm pack --dry-run produced jslike-1.8.5.tgz.
• Published to npm as [email protected] with latest dist-tag.

Fixes #13.

Fixed

• Bind identifiers from defaulted object and array destructuring parameters in functions, async callbacks, methods, and constructors.
• Preserve nested destructuring defaults and rest parameter behavior through shared parameter binding logic.

Verification

• npm run build passed. Existing wang-prism CommonJS warning remains unchanged.
• npm test: 54 passed, 1351 passed | 4 skipped.
• Issue #12 repro shape returns HiHi!.
• npm pack --dry-run produced jslike-1.8.4.tgz.
• Published to npm as [email protected] with latest dist-tag.

Fixes #12.

Fixed

• Initialize JavaScript class instance fields, including arrow function fields that capture this.
• Apply inherited base class field initializers during super(...) and implicit subclass construction.
• Preserve native class-field initialization order across base constructors, derived fields, computed fields, and multi-level inheritance.

Verification

• npm run build passed. Existing wang-prism CommonJS warning remains unchanged.
• npm test: 53 passed, 1344 passed | 4 skipped.
• Issue #11 repro returns {"type":"function","value":42,"keys":["visit","v"]}.
• npm pack --dry-run produced jslike-1.8.3.tgz.
• Published to npm as [email protected] with latest dist-tag.

Fixes #11.

Fixed

• Prevent enhanced method suggestions from invoking strict function caller / arguments accessors or other throwing accessor properties while constructing missing-method errors.
• Keep missing-method errors best-effort when reflection traps throw during method suggestion collection.

Verification

• npm run build passed. Existing wang-prism CommonJS warning remains unchanged.
• npm test: 52 passed, 1336 passed | 4 skipped.
• npm pack --dry-run produced jslike-1.8.2.tgz.
• Published to npm as [email protected] with latest dist-tag.

Fixes #10.

Fixed

• Elide regular TypeScript imports whose local bindings are used only in type positions, matching TypeScript transpilation behavior.
• Preserve runtime binding for mixed imports, default imports, namespace imports, and TSX component imports when they are referenced in value positions.

Verification

• npm run build passed. Existing wang-prism CommonJS warning remains unchanged.
• npm test: 52 passed, 1332 passed | 4 skipped.
• Corrected issue #9 repro against dist/index.cjs returns 7.
• Published to npm as [email protected] with latest dist-tag.

Fixes #9.

Added

• TypeScript and TSX parsing for entry code and imported modules via bundled @sveltejs/acorn-typescript.
• Runtime support for TypeScript erasure semantics: type aliases, interfaces, declare, annotations, type-only imports/exports, type assertions, as, satisfies, non-null assertions, and generic call syntax.
• Runtime support for TypeScript enums and constructor parameter properties.
• sourcePath, typescript, and tsx execution options for parser selection and import context.

Fixed

• Static imports now pass importer context to moduleResolver.resolve(modulePath, fromPath).
• Nested imports use the resolved module path as their fromPath.
• Module caching now uses resolved paths to avoid relative import collisions while preserving repeated bare-import caching.

Verification

• npm test: 52 passed, 1324 passed | 4 skipped.
• Verified the original .ts import repro against dist/index.cjs.
• Published to npm as [email protected] with latest dist-tag.

Fixes #8.

Fixes

• Fix Promise instance method chaining inside WangInterpreter async evaluation.
• Preserve Promise receivers for direct chains, stored variables, assignments, object properties, conditionals, logical expressions, and sequence expressions.
• Add deeper regression coverage for Playwright-style patterns such as await page.locator(selector).isVisible().catch(() => false).

Verification

• npx vitest run: 48 files passed, 1261 tests passed, 4 skipped.

Bug Fix

• fix: Optional chaining in CallExpression callee (#6) — el.innerText?.trim() where innerText is null/undefined now correctly returns undefined instead of throwing a native TypeError. Fixed in both sync and async evaluation paths.

Details

When optional chaining (?.) was used on a method call like obj?.method(), the interpreter attempted to access thisContext[prop] before checking if thisContext was nullish, causing a native TypeError to bypass the optional chaining guard.

The fix adds a node.callee.optional guard before property access in both evaluateCallExpression and the async CallExpression handler in evaluateAsync.

Full Changelog: https://github.com/artpar/jslike/compare/v1.7.1...v1.7.2

Bug Fixes

Arrow Function Lexical this Binding (#3, #2)

Arrow functions now correctly capture this from their lexical enclosing scope at definition time, rather than receiving this from the call site.

Before (broken):

const obj = {
  name: 'Test',
  method() {
    setTimeout(() => {
      console.log(this.name);  // undefined - this was lost!
    }, 100);
  }
};

After (fixed):

const obj = {
  name: 'Test', 
  method() {
    setTimeout(() => {
      console.log(this.name);  // 'Test' - this is captured correctly!
    }, 100);
  }
};

Changes

• Add isArrow flag to function metadata to distinguish arrow functions
• Capture this from enclosing scope when arrow function is created
• Use captured this for arrow functions, ignoring call-site this
• Add comprehensive test suite for arrow function this binding (6 tests)

Issues Closed

• #3 - this binding lost in arrow function inside setTimeout callback
• #2 - setTimeout callback loses closure references to event objects

Full Changelog: https://github.com/artpar/jslike/compare/v1.7.0...v1.7.1

Bug Fix

Fixed a critical bug where the evaluateAsync function was missing a handler for SpreadElement AST nodes, causing workflow failures when LLM-generated code used spread syntax (...) in async contexts.

Error Fixed

Error: Unhandled node type in evaluateAsync: SpreadElement

What's Fixed

Spread syntax now works correctly in all async contexts:

// Function calls with spread
const nums = await fetchNumbers();
const sum = await asyncSum(...nums);

// Method calls with spread
await obj.process(...args);

// Constructor calls with spread
const instance = new MyClass(...await getConfig());

// Array/object literals with await
const combined = [...existingData, ...newData];
const merged = { ...defaults, ...await getOverrides() };

Changes

• Added SpreadElement handler to evaluateAsync() that returns spread markers
• Updated CallExpression argument handling to use flattenSpreadArgs()
• Added abortSignal passthrough in WangInterpreter for cancellation support
• Added comprehensive async spread test suite (53 tests)

Test Coverage

• 53 new async-specific spread tests
• All 1086 existing tests pass
• Zero regressions

Full Changelog: https://github.com/artpar/jslike/compare/v1.6.2...v1.6.3