Run JavaScript in WebAssembly

Now supporting wasmedge socket for HTTP requests and Tensorflow in JavaScript programs!

Prerequisites

Make sure that you will have GCC installed on Ubuntu 20.04.

$ sudo apt update
$ sudo apt install build-essential

Install Rust and use the following command to install the wasm32-wasi target.

$ rustup target add wasm32-wasi

Install wasmedge CLI tool. Make sure that you use the -e all option to install the WasmEdge Tensorflow extensions if you want to try the Tensorflow examples.

Hello world

Build

$ cargo build --target wasm32-wasi --release

Run

$ cd example_js
$ wasmedge --dir .:. ../target/wasm32-wasi/release/wasmedge_quickjs.wasm hello.js WasmEdge Runtime

ES6 module support

Build

$ cargo build --target wasm32-wasi --release

Run

$ cd example_js/es6_module_demo
$ wasmedge --dir .:. ../../target/wasm32-wasi/release/wasmedge_quickjs.wasm demo.js

CommonJS support

Build

$ cargo build --target wasm32-wasi --release --features=cjs

A simple CJS module example

$ cd example_js/simple_common_js_demo
$ wasmedge --dir .:. ../../target/wasm32-wasi/release/wasmedge_quickjs.wasm file_module.js

Use NPM packages via NCC

$ cd example_js/simple_common_js_demo
$ npm install
$ npm run ncc_build
$ wasmedge --dir .:. ../../target/wasm32-wasi/release/wasmedge_quickjs.wasm dist/index.js

HTTP Request

Build

$ cargo build --target wasm32-wasi --release

Run

HTTP client applications.

$ cd example_js
$ wasmedge --dir .:. ../target/wasm32-wasi/release/wasmedge_quickjs.wasm http_demo.js

Run and POST to a HTTP server.

# Start the server
$ cd example_js
$ nohup wasmedge --dir .:. ../target/wasm32-wasi/release/wasmedge_quickjs.wasm http_server_demo.js &

# Access the server
$ curl -d "WasmEdge" -X POST http://localhost:8000
echo:WasmEdge

These examples also show how to import another JavaScript file into the current program.

TensorFlow

Build

Note: Build the QuickJS interpreter with the WasmEdge Tensorflow extension.

$ cargo build --target wasm32-wasi --release --features=tensorflow

Run

$ cd example_js/tensorflow_lite_demo
$ wasmedge-tensorflow-lite --dir .:. ../../target/wasm32-wasi/release/wasmedge_quickjs.wasm main.js

Optional: Get static-lib & binding.rs

If you want to build a custom libquickjs.a to export some static c function.

See [quickjs-wasi]

run quickjs-wasi/lib/build.sh