QuickJS JavaScript Engine

QuickJS Javascript Engine

News

• 2019-07-09:
  • First public release

Introduction

QuickJS is a small and embeddable Javascript engine. It supports the ES2019 specification

including modules, asynchronous generators and proxies.

It optionally supports mathematical extensions such as big integers ( BigInt ), big floating point numbers (BigFloat) and operator overloading.

Main Features:

• Small and easily embeddable: just a few C files, no external dependency, 190 KiB of x86 code for a simple hello world program.
• Fast interpreter with very low startup time: runs the 56000 tests of the ECMAScript Test Suite in about 100 seconds on a single core of a desktop PC. The complete life cycle of a runtime instance completes in less than 300 microseconds.
• Almost complete ES2019 support including modules, asynchronous generators and full Annex B support (legacy web compatibility).
• Passes 100% of the ECMAScript Test Suite.
• Can compile Javascript sources to executables with no external dependency.
• Garbage collection using reference counting (to reduce memory usage and have deterministic behavior) with cycle removal.
• Mathematical extensions: BigInt, BigFloat, operator overloading, bigint mode, math mode.
• Command line interpreter with contextual colorization implemented in Javascript.
• Small built-in standard library with C library wrappers.

Benchmark

Online Demo

An online demonstration of the QuickJS engine with its mathematical extensions is available at numcalc.com

. It was compiled from C to WASM/asm.js with Emscripten.

Documentation

QuickJS documentation:HTML version, PDF version

.

Specification of the JS Bignum Extensions:HTML version, PDF version .

Download

QuickJS source code: quickjs-2019-07-09.tar.xz

QuickJS complete tests: quickjs-tests-2019-07-09.tar.xz

QuickJS unicode data (not needed unless you want to rebuild the unicode tables): quickjs-unicode-data-2019-07-09.tar.xz

Sub-projects

QuickJS embeds the following C libraries which can be used in other projects:

• libregexp : small and fast regexp library fully compliant with the Javascript ES 2019 specification.
• libunicode : small unicode library supporting case conversion, unicode normalization, unicode script queries, unicode general category queries and all unicode binary properties.
• libbf : small library implementing arbitrary precision IEEE 754 floating point operations and transcendental functions with exact rounding. It is maintained as aseparate project.

Licensing

QuickJS is released under the MIT license

.

Unless otherwise specified, the QuickJS sources are copyright Fabrice Bellard and Charlie Gordon.

Fabrice Bellard -https://bellard.org/