change-import-resolution.ts

import { mkdirSync, readFileSync, writeFileSync } from 'fs';
import glob from 'glob';
import path from 'path';

const globAsync = (pattern: string): Promise<string[]> =>
  new Promise<string[]>((res, rej) =>
    glob(pattern, (err, matches) => (err ? rej(err) : res(matches))),
  );

const paths = await globAsync('src/**/*.ts');

for (const filepath of paths) {
  const content = readFileSync(filepath).toString();
  console.log(':: Entering', filepath);
  const updated = content.replace(
    /^import.*from '\.\/?.*';/gim,
    function (substring) {
      const newImport = substring.substring(0, substring.length - 2) + ".js';";
      console.log('::     Replacing', substring, 'to', newImport);
      return newImport;
    },
  );

  const newFilePath = path.join('dist', filepath);
  const directory = path.resolve(newFilePath, '..');
  const baseName = path.basename(newFilePath);
  console.log(':: New directory:', directory);
  const newFile = path.join(directory, baseName);
  console.log(':: Writing to:', newFile);

  mkdirSync(directory, {
    recursive: true,
  });
  writeFileSync(newFile, updated);
  console.log(':: Done');
  console.log('::');
  console.log('::');
}