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$ npx gulp lint:js2
[04:23:20] Using gulpfile ~/src/projectName/gulpfile.js
[04:23:20] Starting 'lint:js2'...
[04:23:20] spawning 4 worker
[04:23:22] Using gulpfile ~/src/projectName/gulpfile.js
[04:23:22] Starting 'lint:js2'...
[04:23:22] 'lint:js2' errored after 2 s
[04:23:22] TypeError: handlers[message.type] is not a function
    at Worker.<anonymous> (/home/bobby/src/projectName/node_modules/gulp-multi-thread-task/index.js:30:29)
    at Worker.emit (events.js:326:22)
    at Worker.EventEmitter.emit (domain.js:506:15)
    at ChildProcess.<anonymous> (internal/cluster/worker.js:32:12)
    at ChildProcess.emit (events.js:314:20)
    at ChildProcess.EventEmitter.emit (domain.js:506:15)
    at emit (internal/child_process.js:876:12)
    at processTicksAndRejections (internal/process/task_queues.js:85:21)
[04:23:22] Using gulpfile ~/src/projectName/gulpfile.js[04:23:22] Starting 'lint:js2'...
[04:23:22] The following tasks did not complete: lint:js2                                                                                                                 
[04:23:22] Did you forget to signal async completion?
[04:23:22] The following tasks did not complete: lint:js2
[04:23:22] Did you forget to signal async completion?
[04:23:23] Using gulpfile ~/src/projectName/gulpfile.js
[04:23:23] Starting 'lint:js2'...
[04:23:23] 'lint:js2' errored after 3.54 ms
[04:23:23] Error: write EPIPE
    at process.target._send (internal/child_process.js:806:20)
    at process.target.send (internal/child_process.js:677:19)
    at _requestFile (/home/bobby/src/projectName/node_modules/gulp-multi-thread-task/lib/message-handlers.js:75:13)
    at workerMessageHandlers (/home/bobby/src/projectName/node_modules/gulp-multi-thread-task/lib/message-handlers.js:110:3)
    at GulpMultiThreadTask (/home/bobby/src/projectName/node_modules/gulp-multi-thread-task/index.js:77:27)
    at /home/bobby/src/projectName/gulpfile.js:81:10
    at lint:js2 (/home/bobby/src/projectName/node_modules/undertaker/lib/set-task.js:13:15)
    at bound (domain.js:427:14)
    at runBound (domain.js:440:12)
    at asyncRunner (/home/bobby/src/projectName/node_modules/async-done/index.js:55:18)

cdn/
    pictures/
         (around 120 .jpg, .png and .gif files, average filesize ~120kB)
    thumbs/
         (around 110 .jpg, .png and .gif files, average filesize ~10kB)

const { task, src, dest } = require('gulp');
const {GulpMultiThreadTask} = require('gulp-multi-thread-task');

const gulpimagemin = require('gulp-imagemin'); // For image handling
const imagemin_webp = require('imagemin-webp'); // Converts JPG/PNG to WebP
const imagemin_gif2webp = require('imagemin-gif2webp'); // Converts only GIF to WebP
const rename = require('gulp-rename');

function webpPicturesTask(done, srcGlob) {
  return src(srcGlob, { base: 'cdn/' })
    .pipe(gulpimagemin([
      imagemin_webp({
        lossless: false,
        method: 6,
      }),
      imagemin_gif2webp({
        lossy: false,
        mixed: false,
        minimize: false,
        method: 6,
        multiThreading: true,
      })
    ], {
      verbose: true
    }))
    .pipe(rename({ extname: '.webp' }))
    .pipe(dest('cdn/'))
  ;

task('webpPictures', function(done, srcGlob) {
  return GulpMultiThreadTask(
    'webpPictures',
    ['cdn/{pictures,thumbs}/**/*.{png,jpg,jpeg,gif}'],
    webpPicturesTask
  );
});