text: /**
   * The MIT License (MIT)
   *
   * Copyright (c) 2014-2019 Mickael Jeanroy
   *
   * Permission is hereby granted, free of charge, to any person obtaining a copy
   * of this software and associated documentation files (the "Software"), to deal
   * in the Software without restriction, including without limitation the rights
   * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
   * copies of the Software, and to permit persons to whom the Software is
   * furnished to do so, subject to the following conditions:
   *
   * The above copyright notice and this permission notice shall be included in
   * all copies or substantial portions of the Software.
   *
   * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
   * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
   * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
   * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
   * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
   * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
   * THE SOFTWARE.
   */
  
  'use strict';
  
  const path = require('path');
  const gulp = require('gulp');
  const eslint = require('gulp-eslint');
  const log = require('../log');
  const config = require('../config');
  
  /**
   * Get all potential sources to run against lint validator.
   *
   * @param {string} ext The file exstension to look for.
   * @return {Array<string>} List of paths.
   */
  function getSources(ext) {
    return [
      path.join(config.root, `*.${ext}`),
      path.join(config.scripts, '**', `*.${ext}`),
      path.join(config.src, '**', `*.${ext}`),
      path.join(config.test, '**', `*.${ext}`),
    ];
  }
  
  /**
   * Run ESLint against JS source files.
   *
   * @return {WritableStream} The stream pipeline.
   */
  module.exports = function lint() {
    const inputs = [
      ...getSources('js'),
      ...getSources('ts'),
    ];
  
    log.debug('Linting files: ');
  
    inputs.forEach((input) => (
      log.debug(`  ${input}`)
    ));
  
    return gulp.src(inputs)
        .pipe(eslint())
        .pipe(eslint.format())
        .pipe(eslint.failAfterError());
  };
  