Hacky script to find un-imported files

unimported.js

const fs = require('fs');
const path = require('path');

const entry = 'src\\index.js';

const importRegex = /^import.+?from ['"]([^'"]+)['"];?\s*$/gm;

function resolve(name) {
  try {
    const withext = `${name}.js`
    const stats = fs.accessSync(withext);
    return withext;
  } catch(e) {
    return `${name}\\index.js`;
  }
}

function getImports(f) {
  const dirname = path.dirname(f);
  const contents = fs.readFileSync(f, {encoding: 'utf8'});
  let withoutComments = contents.replace(/\/\*[\s\S]*?\*\/|([^\\:]|^)\/\/.*$/gm, '$1');
  return getMatches(withoutComments, importRegex, 1)
    .filter(match => match.startsWith('.'))
    .map(match => path.normalize(`${dirname}\\${match}`))
    .map(match => resolve(match));
}

function getMatches(string, regex, index) {
  index || (index = 1); // default to the first capturing group
  var matches = [];
  var match;
  while (match = regex.exec(string)) {
    matches.push(match[index]);
  }
  return matches;
}

const imported = new Set();

function walkImports(f) {
  if (imported.has(f)) return;
  imported.add(f);
  const imports = getImports(f);
  imports.forEach(i => walkImports(i));
}

function walkSync(dir, filelist = []) {
  fs.readdirSync(dir).forEach(file => {
    fs.statSync(path.join(dir, file)).isDirectory()
      ? walkSync(path.join(dir, file), filelist)
      : filelist.push(path.join(dir, file));

  });
  return filelist;
}

walkImports(entry);
const all = new Set(walkSync('src'));

console.log(`Unrequired files (${all.size - imported.size}/${all.size})`);
all.forEach(p => {
  if (!imported.has(p)) {
    console.log(p);
  }
})