esbuild vs terser

0-results.md

https://mehulkar.com/blog/2021/08/terser-vs-esbuild-ember-app-case-study/

1-process-file.js

// Overwrote `node_modules/broccoli-terser-sourcemap/lib/process-file.js` with this to try esbuild vs terser
// Original source: https://github.com/ember-cli/broccoli-terser-sourcemap/blob/master/lib/process-file.js
'use strict';

const debugGn = require('debug');
const defaults = require('lodash.defaultsdeep');
const fs = require('fs');
const path = require('path');
const terser = require('terser');
const esbuild = require('esbuild')
const getSourceMapContent = require('./get-sourcemap-content');

const terserDebug = debugGn('broccoli-terser')
const esbuildDebug = debugGn('broccoli-esbuild')

async function processFileTerser(inFile, outFile, relativePath, outDir, silent, _options, src) {

  let options = defaults({}, _options.terser);

  let start = new Date();

  try {
    let result = await terser.minify(src, options);

    let end = new Date();
    let total = end - start;

    terserDebug('[finished]: %s (%dKB) -> %dKB in %dms', relativePath, (src.length / 1000), (result.code.length / 1000), total);

    fs.writeFileSync(outFile, result.code);
  } catch (e) {
    e.filename = relativePath;
    throw e;
  }
}

async function processFileEsBuild(inFile, outFile, relativePath, outDir, silent, _options, src) {
  let outFile2 = `${path.basename(outFile)}-esbuild.${path.extname(outFile)}`
  let start = new Date();

  try {
    await esbuild.build({
      entryPoints: [inFile],
      bundle: false,
      minify: true,
      outfile: outFile2,
    })
    let end = new Date();
    let total = end - start;
    esbuildDebug(`[debug] outFile2 ${outFile2}`);
    let result = await fs.promises.stat(outFile2)
    esbuildDebug('[finished]: %s (%dKB) -> %dKB in %dms', relativePath, (src.length / 1000), (result.size / 1000), total);
  } catch (e) {
    e.filename = relativePath;
    throw e;
  }
}

module.exports = async function processFile(inFile) {
  let src = fs.readFileSync(inFile, 'utf-8');
  await processFileTerser(...arguments, src);
  // enable this line and re-run ember build
  // await processFileEsBuild(...arguments, src);
};