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hydrogen-web/prototypes/tools/transpile-ie11.mjs

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2020-09-16 17:16:26 +05:30
import fsRoot from "fs";
const fs = fsRoot.promises;
import { rollup } from 'rollup';
// needed for legacy bundle
import babel from '@rollup/plugin-babel';
// needed to find the polyfill modules in the main-legacy.js bundle
import { nodeResolve } from '@rollup/plugin-node-resolve';
// needed because some of the polyfills are written as commonjs modules
import commonjs from '@rollup/plugin-commonjs';
// multi-entry plugin so we can add polyfill file to main
import multi from '@rollup/plugin-multi-entry';
import removeJsComments from 'rollup-plugin-cleanup';
// replace urls of asset names with content hashed version
async function build(inputFile, outputFile) {
// compile down to whatever IE 11 needs
const babelPlugin = babel.babel({
babelHelpers: 'bundled',
exclude: '../../node_modules/**',
presets: [
[
"@babel/preset-env",
{
useBuiltIns: "entry",
corejs: "3",
targets: "IE 11"
}
]
]
});
const polyfillFile = '../../src/worker-polyfill.js';
// create js bundle
const rollupConfig = {
input: [polyfillFile, inputFile],
plugins: [multi(), commonjs(), nodeResolve(), babelPlugin, removeJsComments({comments: "none"})]
};
const bundle = await rollup(rollupConfig);
const {output} = await bundle.generate({
format: 'iife',
name: `bundle`
});
const code = output[0].code;
await fs.writeFile(outputFile, code, "utf8");
}
build(process.argv[2], process.argv[3]);