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

Build & Package

A production‑ready JavaScript interpreter that executes ES6+ code, JSX, and TypeScript/TSX with React integration without using eval() or new Function().

Track releases GitHub

JavaScript Latest v1.8.5 · 27d ago Security brief →

Features

Full ES6+ JavaScript support (classes, destructuring, arrow functions, etc.)
Native JSX parsing and execution without pre‑transformation
TypeScript and TSX module support with bundled @sveltejs/acorn-typescript parser
React integration via custom module resolver for hooks and components
CSP‑safe tree‑walking interpreter (no eval or new Function)
REPL, CLI, and programmatic API for interactive and file execution

Recent releases

View all 10 releases →

v1.8.5 Bug fix 27d

Fixed support for super.method() calls in arrow-function class fields on derived classes.

Full changelog

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.

View release on GitHub

v1.8.4 Bug fix 27d

Fixed binding of identifiers from defaulted object and array destructuring parameters.

Full changelog

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.

View release on GitHub

v1.8.3 Bug fix 27d

Fixed JavaScript class instance field initialization across inheritance hierarchies.

Full changelog

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.

View release on GitHub

v1.8.2 Bug fix 27d

Fixed missing-method errors when reflection traps throw during method suggestion collection.

Full changelog

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.

View release on GitHub

v1.8.1 Bug fix 27d

Fixed handling of mixed import bindings preserving runtime values.

Full changelog

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.