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build.js
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build.js
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const fs = require('fs');
const child_process = require('child_process');
const util = require('util');
const pb = require('pretty-bytes');
const exec = util.promisify(child_process.exec);
const bar = (p) => {
return Array(Math.floor(p * 25)).fill('▉').join('');
};
async function main() {
const sizes = {
rollup: null,
webpack: null,
parcel: null
};
await exec('npx rollup -c');
sizes.rollup = fs.statSync('results/rollup.js').size;
console.log(`rollup: ${pb(sizes.rollup)}`);
await exec('npx webpack');
sizes.webpack = fs.statSync('results/webpack.js').size;
console.log(`webpack: ${pb(sizes.webpack)}`);
await exec('npx parcel build index.js --dist-dir results --no-scope-hoist');
await fs.renameSync("results/index.js", "results/parcel.js");
await fs.renameSync("results/index.js.map", "results/parcel.js.map");
sizes.parcel = fs.statSync('results/parcel.js').size;
console.log(`parcel: ${pb(sizes.parcel)}`);
const max_size = Math.max(...Object.values(sizes));
const results = `
| | output size |
|---------|-------------------------------------------------------|
| rollup | ${bar(sizes.rollup / max_size)} ${pb(sizes.rollup)} |
| webpack | ${bar(sizes.webpack / max_size)} ${pb(sizes.webpack)} |
| parcel | ${bar(sizes.parcel / max_size)} ${pb(sizes.parcel)} |
`.trim();
const README = fs.readFileSync('README.md', 'utf-8').replace(/<!-- START -->[\s\S]+<!-- END -->/m, `<!-- START -->\n${results}\n<!-- END -->`);
fs.writeFileSync('README.md', README);
console.log(`wrote results to README.md`);
}
main();