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Type Name Latest commit message Commit time
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.github Add a fallback for argumentsLength without mutable-globals (#1084) Jan 29, 2020
bin Rework loop statement compilation / general cleanup (#1046) Jan 11, 2020
cli Fix wasi_snapshot, should be wasi_snapshot_preview1 (#1099) Feb 9, 2020
examples Implement StaticArray<T> (#1122) Feb 26, 2020
lib Add a fallback for argumentsLength without mutable-globals (#1084) Jan 29, 2020
media Add architecture diagram to media Mar 18, 2018
scripts Add a browser SDK example (#1079) Jan 28, 2020
snap Rename memory instructions; Rework constant handling (#177) Jul 20, 2018
src Propagate contextual type arguments to generated constructors (#1126) Feb 26, 2020
std Implement StaticArray<T> (#1122) Feb 26, 2020
tests Propagate contextual type arguments to generated constructors (#1126) Feb 26, 2020
.gitattributes Implement text encoding helpers on top of the new runtime (#679) Jun 21, 2019
.gitignore Forward useful improvements within blocked PRs (#964) Nov 18, 2019 Add contributing guidelines Mar 16, 2018 Update Jan 30, 2019
LICENSE Added license Sep 29, 2017
NOTICE Fix const enum compilation failure (#1120) Feb 26, 2020 Minor improvements (#1094) Feb 8, 2020
index.d.ts More publish fixes (#945) Nov 9, 2019
index.js Clean up release dependencies (#950) Nov 13, 2019
index.release.d.ts More publish fixes (#945) Nov 9, 2019
index.release.js More publish fixes (#945) Nov 9, 2019
package-lock.json Slice version 0.9.2 (#1110) Feb 14, 2020
package.json Slice version 0.9.2 (#1110) Feb 14, 2020
tsconfig-base.json CString/CArray was an illusion; Update and test tsconfig files Dec 11, 2017
tsconfig-docs.json Set up documentation generation Mar 19, 2018
tslint.json Implement reference counting (#592) Jun 5, 2019
webpack.config.js Prepare for Binaryen compiled to Wasm (#1029) Dec 31, 2019


Actions Status npm npm@nightly

AssemblyScript compiles a strict subset of TypeScript (basically JavaScript with types) to WebAssembly using Binaryen. It generates lean and mean WebAssembly modules while being just an npm install away.

Check out the documentation or try it out in WebAssembly Studio!

Our Sponsors

Our Backers

The core team members and most contributors do this open source work in their free time. If you use AssemblyScript for a serious task or plan to do so, and you'd like us to invest more time on it, please donate to our OpenCollective. By sponsoring this project, your logo will show up above. Thank you so much for your support!


You are now able to write WebAssembly, without learning a new language, and harness all these benefits WebAssembly might offer you. I think that is kind of powerful. [...] It [AssemblyScript] is absolutely usable, and very enjoyable! - Surma, WebAssembly for Web Developers (Google I/O ’19) (May 8th, 2019)

AssemblyScript was frictionless. Not only does it allow you to use TypeScript to write WebAssembly, [...] it also produces glue-free WebAssembly modules that are very small with decent performance. – Surma, Replacing a hot path in your app's JavaScript with WebAssembly (Feb 16, 2019)

Perhaps the fundamental issue [to get a small .wasm file] is that JavaScript is the only language for which the Web runtime is a perfect fit. Close relatives that were designed to compile to it, like TypeScript, can be very efficient as well. But languages like C, C++, Rust, and so forth were not originally designed for that purpose. – Alon Zakai, Small WebAssembly Binaries with Rust + Emscripten (Apr 18, 2018)

JavaScript's heyday as the only browser language is over, but most web developers are used to writing JavaScript, and learning a new syntax just to get access to WebAssembly is not (always) ideal. If only there was something in to bridge the gap… – Jani Tarvainen, TypeScript is the bridge between JavaScript and WebAssembly (Feb 20, 2018)

I do think [compiling TypeScript into WASM] is tremendously useful. It allows JavaScript developers to create WASM modules without having to learn C. – Colin Eberhardt, Exploring different approaches to building WebAssembly modules (Oct 17, 2017)

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