genBuildFileSize.js

genBuildFileSize.js

const fs = require('fs').promises;
const path = require('path');
const prettyBytes = require('pretty-bytes');

const buildDir = 'build';
const blackListedFiles = ['build/git-log.json'];
const blackListedDirs = ['build/report'];

const isArrayHas = (arr, str) => {
  const outOfIndex = -1;
  return arr.indexOf(str) !== outOfIndex;
};
async function walk(dir) {
  let files = await fs.readdir(dir);
  //console.log('files', files);
  files = await Promise.all(
    files.map(async (file) => {
      const filePath = path.join(dir, file);
      const stats = await fs.stat(filePath);
      const size = stats.size;
      const sizep = prettyBytes(stats.size);
      if (stats.isDirectory()) {
        if (!isArrayHas(blackListedDirs, filePath)) {
          return walk(filePath);
        }
      } else if (stats.isFile()) {
        if (!isArrayHas(blackListedFiles, filePath)) {
          var fA = filePath.split('.');
          if (fA[fA.length - 1] !== 'map') {
            const fPath = filePath
              .split('.')
              .filter((x) => !new RegExp(/^([a-f0-9]){8}$/).test(x))
              .join('.');
            return { filePath: fPath, size, sizep };
          }
        }
      }
    })
  );

  return files.reduce((all, folderContents) => all.concat(folderContents), []);
}

(async () => {
  try {
    const list = await walk(buildDir);
    console.warn('Welcome to File Size Checked Utility');
    await fs.writeFile(
      'report/bundle-size.json',
      JSON.stringify(
        list.filter((x) => x !== undefined),
        null,
        '\t'
      )
    );
    console.warn('File written - report/bundle-size.json');
  } catch (error) {
    console.error(error);
  }
})();