lint-to-the-future-eslint/lib/get-files.js

`lint-to-the-future-eslint` is a plugin for [lint-to-the-future](https://github.com/mansona/lint-to-the-future) that is designed to integrate with [eslint](https://eslint.org/).

import { readFileSync } from 'fs';
import walkSync from 'walk-sync';
import { join } from 'path';

export default function getFiles(cwd, providedGlob) {
  let ignoreFile;

  try {
    ignoreFile = readFileSync(join(cwd, '.gitignore'), 'utf8')
      .split('\n')
      .filter((line) => line.length)
      .filter((line) => !line.startsWith('#'))
      // walkSync can't handle these
      .filter((line) => !line.startsWith('!'))
      .map((line) => line.replace(/^\//, ''))
      .map((line) => line.replace(/\/$/, '/*'));
  } catch {
    // noop
  }

  let globs;

  if (providedGlob) {
    globs = [providedGlob];
  } else {
    globs = ['**/*.js', '**/*.ts'];
  }

  return walkSync(cwd, {
    globs,
    ignore: ignoreFile || ['**/node_modules/*'],
    directories: false,
  });
};