WebAssembly ORG

WebAssembly Design Documents

The official design documents for WebAssembly, explaining why it was built, how its security model works, and the trade-offs behind key decisions, maintained by the W3C WebAssembly Community Group.

Optimizer and compiler/toolchain library for WebAssembly

C++ library and toolkit for compiling and optimizing code to WebAssembly, used internally by Emscripten, Rust, Kotlin, and other languages that target the browser.

The WebAssembly Binary Toolkit

WebAssembly System Interface

WebAssembly specification, reference interpreter, and test suite.

WASI-enabled WebAssembly C/C++ toolchain

Repository for design and specification of the Component Model

Tracking WebAssembly proposals

Branch of the spec repo scoped to discussion of GC integration in WebAssembly

WASI libc implementation for WebAssembly

Threads and Atomics in WebAssembly

No description.

Wasm C API prototype

Branch of the spec repo scoped to discussion of SIMD in WebAssembly

Neural Network proposal for WASI

WebAssembly meetings (VC or in-person), agendas, and notes

ECMAScript module integration

Conventions supporting interoperatibility between tools working with WebAssembly.

Standalone VM using LLVM JIT

WASI API proposal for managing sockets

WebAssembly website

Memory with 64-bit indexes

Mirror of the spec testsuite

Filesystem API for WASI

A collection of interfaces for sending and receiving HTTP requests and responses

A repository for the stack switching proposal.

No description.

I/O Types proposal for WASI

WASI Cryptography API Proposal

No description.

Proposal to add exception handling to WebAssembly

Proposal for adding basic reference types (anyref)

Multiple per-module memories for Wasm

Proposal for allowing modules to define, import and export modules and instances

WebAssembly module decoder in C++

Proposal to add tail calls to WebAssembly

JavaScript Promise Integration

Design documents and discussions about debug support in WebAssembly

Command-Line Interface (CLI) World for WASI

Proposal for Typed Function References

Library for interpreting / debugging wasm code

A draft proposal for spawning threads in WebAssembly

WASI Testsuite

Bulk memory operations

Proposal to add multi-values to WebAssembly

No description.

Clocks API for WASI

Relax the strict determinism requirements of SIMD operations.

A proposal to introduce finer grained control of WebAssembly memory.

Vector operations for WebAssembly

Proposal for adding type reflection to the JS API

No description.

Build and test bots

Entropy source API for WASI

No description.

No description.

JavaScript BigInt to WebAssembly i64 integration

Precursor to WASI libc.

No description.

Messaging proposal for WASI

WebAssembly specification, reference interpreter, and test suite for the jit-interfaces proposal.

No description.

Starter template for proposing a new WASI API

Resources for collaborative benchmarking

Observability World for WASI

wasi-parallel is a proposal to add a parallel for construct to WASI.

No description.

JS String Builtins

WASI logging API

I2C API for WASI

Proposal for Custom Annotation Syntax in the Text Format

Proposal for Type Imports & Exports

Constant-time WebAssembly

OpenTelemetry API for WASI

Sign-extension opcodes

Proposal for adding funclets - flexible intraprocedural control flow

Proposal to add branch hinting functionality to WebAssembly

WASI tools

Proposal to add non-trapping float-to-int conversions to WebAssembly

Import & export of mutable globals

Web Assembly (WASM) logo proposal

No description.

No description.

No description.

Proposal to add instrumentation and tracing instructions to WebAssembly

WebAssembly proposal for wide arithmetic

[complete] Proposal for extended constant expressions

No description.

No description.

Redirect to webassembly.org

Proposal to introduce half precision operations

No description.

No description.

Profiles proposal

No description.

Serial Peripheral Interface (SPI) API for WASI

Custom RTTs and JS interop for Wasm GC structs

Additional JS primitive builtins

GPIO interface for WASI

WebAssembly testsuite tests converted to single-file JavaScript tests

No description.

Staging repository for upstreaming WebAssembly support into lld

No description.

SSL/TLS interface for WASI

No description.

Spec proposal for scanning/marking of linear memory GC roots

No description.

No description.

Proposed WebAssembly Working Group charter

Proposal to add numeric values to data segment definitions in the text format

Proposal repository for compact import sections

Compilation Hints

No description.

No description.

No description.

Proposed WebAssembly Community Group charter

No description.

Subsumed by the benchmarks repo

No description.

No description.

Conditional segment initialization

No description.

No description.

A proposal for introducing freezable GC/global values.

No description.

No description.

JS Text Encoding Builtins

Default community health files for all WebAssembly repos