NodeJS and NPM module

With rollup.js, we can run CommonJS (CJS) and NodeJS (NPM) modules in WasmEdge too. The simple_common_js_demo/npm_main.js demo shows how it works. It utilizes the third-party md5 and mathjs modules.

  1. const md5 = require('md5');
  2. console.log('md5(message)=', md5('message'));
  4. const {sqrt} = require('mathjs');
  5. console.log('sqrt(-4)=', sqrt(-4).toString());

In order to run it, we must first use the rollup.js tool to build all dependencies into a single file. In the process, rollup.js converts CommonJS modules into WasmEdge-compatible ES6 modules. The build script is rollup.config.js.

  1. const {babel} = require('@rollup/plugin-babel');
  2. const nodeResolve = require('@rollup/plugin-node-resolve');
  3. const commonjs = require('@rollup/plugin-commonjs');
  4. const replace = require('@rollup/plugin-replace');
  6. const globals = require('rollup-plugin-node-globals');
  7. const builtins = require('rollup-plugin-node-builtins');
  8. const plugin_async = require('rollup-plugin-async');
  10. const babelOptions = {
  11.   'presets': ['@babel/preset-react']
  12. };
  14. module.exports = [
  15.   {
  16.     input: './npm_main.js',
  17.     output: {
  18.       inlineDynamicImports: true,
  19.       file: 'dist/npm_main.mjs',
  20.       format: 'esm',
  21.     },
  22.     external: ['process', 'wasi_net','std'],
  23.     plugins: [
  24.       plugin_async(),
  25.       nodeResolve(),
  26.       commonjs({ignoreDynamicRequires: false}),
  27.       babel(babelOptions),
  28.       globals(),
  29.       builtins(),
  30.       replace({
  31.         'process.env.NODE_ENV': JSON.stringify('production'),
  32.         'process.env.NODE_DEBUG': JSON.stringify(''),
  33.       }),
  34.     ],
  35.   },
  36. ];

The package.json file specifies the rollup.js dependencies and the command to build the npm_main.js demo program into a single bundle.

  1. {
  2.   "dependencies": {
  3.     "mathjs": "^9.5.1",
  4.     "md5": "^2.3.0"
  5.   },
  6.   "devDependencies": {
  7.     "@babel/core": "^7.16.5",
  8.     "@babel/preset-env": "^7.16.5",
  9.     "@babel/preset-react": "^7.16.5",
  10.     "@rollup/plugin-babel": "^5.3.0",
  11.     "@rollup/plugin-commonjs": "^21.0.1",
  12.     "@rollup/plugin-node-resolve": "^7.1.3",
  13.     "@rollup/plugin-replace": "^3.0.0",
  14.     "rollup": "^2.60.1",
  15.     "rollup-plugin-babel": "^4.4.0",
  16.     "rollup-plugin-node-builtins": "^2.1.2",
  17.     "rollup-plugin-node-globals": "^1.4.0",
  18.     "rollup-plugin-async": "^1.2.0"
  19.   },
  20.   "scripts": {
  21.     "build": "rollup -c rollup.config.js"
  22.   }
  23. }

Run the following NPM commands to build npm_main.js demo program into dist/npm_main.mjs.

  1. npm install
  2. npm run build

Run the result JS file in WasmEdge CLI as follows.

  1. $ wasmedge --dir .:. ../../target/wasm32-wasi/release/wasmedge_quickjs.wasm dist/npm_main.mjs
  2. md5(message)= 78e731027d8fd50ed642340b7c9a63b3
  3. sqrt(-4)= 2i

You can import and run any pure-JS NPM packages in WasmEdge this way.