gulp-css/gulp3file.js at master · rameshmohanreddy/gulp-css · GitHub

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(() => {

  'use strict';

  /**************** Gulp.js 3 configuration ****************/

  const

    // development or production
    devBuild  = ((process.env.NODE_ENV || 'development').trim().toLowerCase() === 'development'),

    // directory locations
    dir = {
      src         : 'src/',
      build       : 'build/'
    },

    // modules
    gulp          = require('gulp'),
    del           = require('del'),
    noop          = require('gulp-noop'),
    newer         = require('gulp-newer'),
    size          = require('gulp-size'),
    imagemin      = require('gulp-imagemin'),
    sass          = require('gulp-sass'),
    postcss       = require('gulp-postcss'),
    sourcemaps    = devBuild ? require('gulp-sourcemaps') : null,
    browsersync   = devBuild ? require('browser-sync').create() : null;


  console.log('Gulp', devBuild ? 'development' : 'production', 'build');


  /**************** clean task ****************/

  gulp.task('clean', () => {

    del([ dir.build ]);

  });


  /**************** images task ****************/

  const imgConfig = {
    src           : dir.src + 'images/**/*',
    build         : dir.build + 'images/',

    minOpts: {
      optimizationLevel: 5
    }
  };

  gulp.task('images', () =>

    gulp.src(imgConfig.src)
      .pipe(newer(imgConfig.build))
      .pipe(imagemin(imgConfig.minOpts))
      .pipe(size({ showFiles:true }))
      .pipe(gulp.dest(imgConfig.build))

  );


  /**************** CSS task ****************/

  const cssConfig = {

    src         : dir.src + 'scss/main.scss',
    watch       : dir.src + 'scss/**/*',
    build       : dir.build + 'css/',
    sassOpts: {
      sourceMap       : devBuild,
      outputStyle     : 'nested',
      imagePath       : '/images/',
      precision       : 3,
      errLogToConsole : true
    },

    postCSS: [
      require('postcss-assets')({
        loadPaths: ['images/'],
        basePath: dir.build
      }),
      require('autoprefixer')({
        browsers: ['> 1%']
      })
    ]

  };

  // remove unused selectors and minify production CSS
  if (!devBuild) {

    cssConfig.postCSS.push(
      require('usedcss')({ html: ['index.html'] }),
      require('cssnano')
    );

  }

  gulp.task('css', ['images'], () =>

    gulp.src(cssConfig.src)
      .pipe(sourcemaps ? sourcemaps.init() : noop())
      .pipe(sass(cssConfig.sassOpts).on('error', sass.logError))
      .pipe(postcss(cssConfig.postCSS))
      .pipe(sourcemaps ? sourcemaps.write() : noop())
      .pipe(size({ showFiles:true }))
      .pipe(gulp.dest(cssConfig.build))
      .pipe(browsersync ? browsersync.reload({ stream: true }) : noop())

  );


  /**************** server task ****************/

  const syncConfig = {
    server: {
      baseDir   : './',
      index     : 'index.html'
    },
    port        : 8000,
    open        : false
  };

  // browser-sync
  gulp.task('server', () =>
    browsersync ? browsersync.init(syncConfig) : null
  );


  /**************** watch task ****************/

  gulp.task('default', ['css', 'server'], () => {

    // image changes
    gulp.watch(imgConfig.src, ['images']);

    // CSS changes
    gulp.watch(cssConfig.watch, ['css']);

  });


})();