Small, modern JavaScript engine for embedding in C/C++ applications.
JavaScript engines, like V8, are fantastic, but they bring long compile times, large memory footprints, and can be difficult or impossible to compile for older platforms. The small engines, like QuickJS, are not frequently updated and lack modern JavaScript support. JJS aims to address the use case of just embedding a small, modern JavaScript engine into an application.
JJS uses the old JerryScript project as a base. The JerryScript code was a rigorous implementation of the ECMA spec with solid test coverage and many modern ECMA proposals implemented. Despite all of this work and project potential, the project appears to be abandoned. Also, the name was very... problematic from a perception and a cultural standpoint.
The only reasonable option was to fork the project and rebrand to continue development.
- Easy to embed or bind C99 library.
- Small memory footprint.
- Modern JavaScript (partially ECMA 2022 compliant).
- Snapshots.
- Top Level Await
- FinalizationRegistry
- C++ Bindings
- Performance improvements
- Fix parse errors with private fields
- Add module support to snapshots
- Improve snapshot tooling
- Fix ECMA conformance tests
- Zig compiler support
- Set the initial JJS version to 4.0.0.
- Add heap configuration at engine initialization.
- Add jjs_has_pending_jobs() API to check for pending async tasks.
- Fix import/export parsing bugs.
- Fix global variable scope bug when importing.
- Rebranded API to remove problematic "jerry" prefix.
- Add MSVC compiler support.
- Added Optional Chaining (https://github.com/tc39/proposal-optional-chaining)
- Fix issues with undefined behavior.
- Some support for compiling and embedding with Zig.
- Continued support for microcontrollers.
- WASM.
- Internalization and Localization.
- Temporal.
JJS is licensed under the Apache 2.0 license. See LICENSE for details.