npm start fails when implementing it on existing theme

[kumaillakhani]

My wpgulp.config.js file

/**
 * WPGulp Configuration File
 *
 * 1. Edit the variables as per your project requirements.
 * 2. In paths you can add <<glob or array of globs>>.
 *
 * @package WPGulp
 */

module.exports = {

	// Project options.
	projectURL: 'http://wptest1.local', // Local project URL of your already running WordPress site. Could be something like wpgulp.local or localhost:3000 depending upon your local WordPress setup.
	productURL: './', // Theme/Plugin URL. Leave it like it is, since our gulpfile.js lives in the root folder.
	browserAutoOpen: false,
	injectChanges: true,

	// Style options.
	styleSRC: './css/style.css', // Path to main .scss file.
	styleDestination: './', // Path to place the compiled CSS file. Default set to root folder.
	outputStyle: 'compact', // Available options → 'compact' or 'compressed' or 'nested' or 'expanded'
	errLogToConsole: true,
	precision: 10,

	// JS Vendor options.
	jsVendorSRC: './js/*.js', // Path to JS vendor folder.
	jsVendorDestination: './assets/js/', // Path to place the compiled JS vendors file.
	jsVendorFile: 'vendor', // Compiled JS vendors file name. Default set to vendors i.e. vendors.js.

	// JS Custom options.
	jsCustomSRC: './js/custom/*.js', // Path to JS custom scripts folder.
	jsCustomDestination: './assets/js/', // Path to place the compiled JS custom scripts file.
	jsCustomFile: 'custom', // Compiled JS custom file name. Default set to custom i.e. custom.js.

	// Images options.
	imgSRC: './images/**/*', // Source folder of images which should be optimized and watched. You can also specify types e.g. raw/**.{png,jpg,gif} in the glob.
	imgDST: './assets/img/', // Destination folder of optimized images. Must be different from the imagesSRC folder.

	// Watch files paths.
	watchStyles: './css/**/*.scss', // Path to all *.scss files inside css folder and inside them.
	watchJsVendor: './js/*.js', // Path to all vendor JS files.
	watchJsCustom: './js/custom/*.js', // Path to all custom JS files.
	watchPhp: './**/*.php', // Path to all PHP files.

	// Translation options.
	textDomain: 'WPGULP', // Your textdomain here.
	translationFile: 'WPGULP.pot', // Name of the translation file.
	translationDestination: './languages', // Where to save the translation files.
	packageName: 'WPGULP', // Package name.
	bugReport: 'https://AhmadAwais.com/contact/', // Where can users report bugs.
	lastTranslator: 'Ahmad Awais <your_email@email.com>', // Last translator Email ID.
	team: 'AhmadAwais <your_email@email.com>', // Team's Email ID.

	// Browsers you care about for autoprefixing. Browserlist https://github.com/ai/browserslist
	// The following list is set as per WordPress requirements. Though, Feel free to change.
	BROWSERS_LIST: [
		'last 2 version',
		'> 1%',
		'ie >= 11',
		'last 1 Android versions',
		'last 1 ChromeAndroid versions',
		'last 2 Chrome versions',
		'last 2 Firefox versions',
		'last 2 Safari versions',
		'last 2 iOS versions',
		'last 2 Edge versions',
		'last 2 Opera versions'
	]
};

---

Terminal:

npm start

your-project@1.0.0 start /Local Sites/wptest1/app/public/wp-content/themes/myTheme
gulp

[20:59:16] Requiring external module @babel/register
[20:59:38] Using gulpfile /Local Sites/wptest1/app/public/wp-content/themes/myTheme/gulpfile.babel.js
[20:59:38] Starting 'default'...
[20:59:38] Starting 'styles'...
[20:59:38] Starting 'vendorsJS'...
[20:59:38] Starting 'customJS'...
[20:59:38] Starting 'images'...
[20:59:38] Starting 'browsersync'...
[20:59:38] Starting ''...
[20:59:42] Finished 'browsersync' after 3.54 s
[20:59:42] Finished 'customJS' after 3.63 s
[Browsersync] Proxying: http://wptest1.local
[Browsersync] Access URLs:

   Local: http://localhost:3000
External: http://192.168.8.100:3000

---

      UI: http://localhost:3001

UI External: http://localhost:3001

[20:59:51] 'styles' errored after 13 s
[20:59:51] Error: missing '}' near line 5:25
at error (/Local Sites/wptest1/app/public/wp-content/themes/myTheme/node_modules/css-parse/index.js:57:15)
at declarations (/Local Sites/wptest1/app/public/wp-content/themes/myTheme/node_modules/css-parse/index.js:224:26)
at rule (/Local Sites/wptest1/app/public/wp-content/themes/myTheme/node_modules/css-parse/index.js:481:21)
at rules (/Local Sites/wptest1/app/public/wp-content/themes/myTheme/node_modules/css-parse/index.js:103:56)
at stylesheet (/Local Sites/wptest1/app/public/wp-content/themes/myTheme/node_modules/css-parse/index.js:73:16)
at module.exports (/Local Sites/wptest1/app/public/wp-content/themes/myTheme/node_modules/css-parse/index.js:485:10)
at Transform.transform [as _transform] (/Local Sites/wptest1/app/public/wp-content/themes/myTheme/node_modules/gulp-merge-media-queries/index.js:133:19)
at Transform._read (/Local Sites/wptest1/app/public/wp-content/themes/myTheme/node_modules/gulp-merge-media-queries/node_modules/readable-stream/lib/_stream_transform.js:184:10)
at Transform._write (/Local Sites/wptest1/app/public/wp-content/themes/myTheme/node_modules/gulp-merge-media-queries/node_modules/readable-stream/lib/_stream_transform.js:172:12)
at doWrite (/Local Sites/wptest1/app/public/wp-content/themes/myTheme/node_modules/gulp-merge-media-queries/node_modules/readable-stream/lib/_stream_writable.js:237:10)
at writeOrBuffer (/Local Sites/wptest1/app/public/wp-content/themes/myTheme/node_modules/gulp-merge-media-queries/node_modules/readable-stream/lib/_stream_writable.js:227:5)
at Transform.Writable.write (/Local Sites/wptest1/app/public/wp-content/themes/myTheme/node_modules/gulp-merge-media-queries/node_modules/readable-stream/lib/_stream_writable.js:194:11)
at StreamFilter.ondata (/Local Sites/wptest1/app/public/wp-content/themes/myTheme/node_modules/readable-stream/lib/_stream_readable.js:619:20)
at StreamFilter.emit (events.js:210:5)
at StreamFilter.EventEmitter.emit (domain.js:498:23)
at addChunk (/Local Sites/wptest1/app/public/wp-content/themes/myTheme/node_modules/readable-stream/lib/_stream_readable.js:291:12)
at readableAddChunk (/Local Sites/wptest1/app/public/wp-content/themes/myTheme/node_modules/readable-stream/lib/_stream_readable.js:278:11)
at StreamFilter.Readable.push (/Local Sites/wptest1/app/public/wp-content/themes/myTheme/node_modules/readable-stream/lib/_stream_readable.js:245:10)
at StreamFilter.Transform.push (/Local Sites/wptest1/app/public/wp-content/themes/myTheme/node_modules/readable-stream/lib/_stream_transform.js:148:32)
at StreamFilterCallback (/Local Sites/wptest1/app/public/wp-content/themes/myTheme/node_modules/streamfilter/src/index.js:30:15)
at streamfilter.objectMode (/Local Sites/wptest1/app/public/wp-content/themes/myTheme/node_modules/gulp-filter/index.js:33:3)
at StreamFilter.streamFilterTransform [as _transform] (/Local Sites/wptest1/app/public/wp-content/themes/myTheme/node_modules/streamfilter/src/index.js:28:5)
at StreamFilter.Transform._read (/Local Sites/wptest1/app/public/wp-content/themes/myTheme/node_modules/readable-stream/lib/_stream_transform.js:184:10)
at StreamFilter.Transform._write (/Local Sites/wptest1/app/public/wp-content/themes/myTheme/node_modules/readable-stream/lib/_stream_transform.js:172:83)
at doWrite (/Local Sites/wptest1/app/public/wp-content/themes/myTheme/node_modules/readable-stream/lib/_stream_writable.js:428:64)
at writeOrBuffer (/Local Sites/wptest1/app/public/wp-content/themes/myTheme/node_modules/readable-stream/lib/_stream_writable.js:417:5)
at StreamFilter.Writable.write (/Local Sites/wptest1/app/public/wp-content/themes/myTheme/node_modules/readable-stream/lib/_stream_writable.js:334:11)
at Pumpify.ondata (/Local Sites/wptest1/app/public/wp-content/themes/myTheme/node_modules/readable-stream/lib/_stream_readable.js:619:20)
at Pumpify.emit (events.js:215:7)
at Pumpify.EventEmitter.emit (domain.js:498:23)
at addChunk (/Local Sites/wptest1/app/public/wp-content/themes/myTheme/node_modules/readable-stream/lib/_stream_readable.js:291:12)
at readableAddChunk (/Local Sites/wptest1/app/public/wp-content/themes/myTheme/node_modules/readable-stream/lib/_stream_readable.js:278:11)
at Pumpify.Readable.push (/Local Sites/wptest1/app/public/wp-content/themes/myTheme/node_modules/readable-stream/lib/_stream_readable.js:245:10)
at Pumpify.Duplexify.forward (/Local Sites/wptest1/app/public/wp-content/themes/myTheme/node_modules/duplexify/index.js:170:26)
at DestroyableTransform.onreadable (/Local Sites/wptest1/app/public/wp-content/themes/myTheme/node_modules/duplexify/index.js:134:10)
at DestroyableTransform.emit (events.js:210:5)
at DestroyableTransform.EventEmitter.emit (domain.js:498:23)
at emitReadable (/Local Sites/wptest1/app/public/wp-content/themes/myTheme/node_modules/readable-stream/lib/_stream_readable.js:504:10)
at emitReadable (/Local Sites/wptest1/app/public/wp-content/themes/myTheme/node_modules/readable-stream/lib/_stream_readable.js:498:62)
at addChunk (/Local Sites/wptest1/app/public/wp-content/themes/myTheme/node_modules/readable-stream/lib/_stream_readable.js:298:29)
at readableAddChunk (/Local Sites/wptest1/app/public/wp-content/themes/myTheme/node_modules/readable-stream/lib/_stream_readable.js:278:11)
at DestroyableTransform.Readable.push (/Local Sites/wptest1/app/public/wp-content/themes/myTheme/node_modules/readable-stream/lib/_stream_readable.js:245:10)
at DestroyableTransform.Transform.push (/Local Sites/wptest1/app/public/wp-content/themes/myTheme/node_modules/readable-stream/lib/_stream_transform.js:148:32)
at DestroyableTransform.afterTransform (/Local Sites/wptest1/app/public/wp-content/themes/myTheme/node_modules/readable-stream/lib/_stream_transform.js:91:10)
at onWritten (/Local Sites/wptest1/app/public/wp-content/themes/myTheme/node_modules/vinyl-fs/lib/dest/write-contents/index.js:51:7)
at onClosed (/Local Sites/wptest1/app/public/wp-content/themes/myTheme/node_modules/vinyl-fs/lib/file-operations.js:26:5)
at /Local Sites/wptest1/app/public/wp-content/themes/myTheme/node_modules/graceful-fs/graceful-fs.js:57:14
at FSReqCallback.oncomplete (fs.js:146:23)

[20:59:51] 'default' errored after 13 s
[20:59:51] The following tasks did not complete: vendorsJS, images,
[20:59:51] Did you forget to signal async completion?
npm ERR! code ELIFECYCLE
npm ERR! errno 1
npm ERR! your-project@1.0.0 start: gulp
npm ERR! Exit status 1
npm ERR!
npm ERR! Failed at the your-project@1.0.0 start script.
npm ERR! This is probably not a problem with npm. There is likely additional logging output above.

npm ERR! A complete log of this run can be found in:
npm ERR! /Users/myUserName/.npm/_logs/2019-12-30T15_59_51_358Z-debug.log

---

Log file:

0 info it worked if it ends with ok
1 verbose cli [ '/usr/local/bin/node', '/usr/local/bin/npm', 'start' ]
2 info using npm@6.13.4
3 info using node@v12.14.0
4 verbose run-script [ 'prestart', 'start', 'poststart' ]
5 info lifecycle your-project@1.0.0prestart: your-project@1.0.0
6 info lifecycle your-project@1.0.0start: your-project@1.0.0
7 verbose lifecycle your-project@1.0.0start: unsafe-perm in lifecycle true
8 verbose lifecycle your-project@1.0.0start: PATH: /usr/local/lib/node_modules/npm/node_modules/npm-lifecycle/node-gyp-bin:/Local Sites/wptest1/app/public/wp-content/themes/myTheme/node_modules/.bin:/Users/myUserName/.cargo/bin:/usr/local/bin:/usr/bin:/bin:/usr/sbin:/sbin
9 verbose lifecycle your-project@1.0.0start: CWD: /Local Sites/wptest1/app/public/wp-content/themes/myTheme
10 silly lifecycle your-project@1.0.0start: Args: [ '-c', 'gulp' ]
11 silly lifecycle your-project@1.0.0start: Returned: code: 1 signal: null
12 info lifecycle your-project@1.0.0start: Failed to exec start script
13 verbose stack Error: your-project@1.0.0 start: gulp
13 verbose stack Exit status 1
13 verbose stack at EventEmitter. (/usr/local/lib/node_modules/npm/node_modules/npm-lifecycle/index.js:332:16)
13 verbose stack at EventEmitter.emit (events.js:210:5)
13 verbose stack at ChildProcess. (/usr/local/lib/node_modules/npm/node_modules/npm-lifecycle/lib/spawn.js:55:14)
13 verbose stack at ChildProcess.emit (events.js:210:5)
13 verbose stack at maybeClose (internal/child_process.js:1021:16)
13 verbose stack at Process.ChildProcess._handle.onexit (internal/child_process.js:283:5)
14 verbose pkgid your-project@1.0.0
15 verbose cwd /Local Sites/wptest1/app/public/wp-content/themes/myTheme
16 verbose Darwin 19.2.0
17 verbose argv "/usr/local/bin/node" "/usr/local/bin/npm" "start"
18 verbose node v12.14.0
19 verbose npm v6.13.4
20 error code ELIFECYCLE
21 error errno 1
22 error your-project@1.0.0 start: gulp
22 error Exit status 1
23 error Failed at the your-project@1.0.0 start script.
23 error This is probably not a problem with npm. There is likely additional logging output above.
24 verbose exit [ 1, true ]

[vzRowan]

I have the same issue, did you find a solution yet?

[multimedianj]

Same issue. Images and CSS compilation is working. When I put my path of JS files to compile, that's when the error message appears Did you forget to signal async completion?.

It seems to be a problem since Gulp4 that has to be resolved like this : https://stackoverflow.com/questions/36897877/gulp-error-the-following-tasks-did-not-complete-did-you-forget-to-signal-async#answer-36899424

[multimedianj]

I commented all the task to see if I get the error again, it really seems that this task causes the error : gulp.watch( config.watchJsCustom, gulp.series( 'customJS', reload ) );

And it seems like in the task, this pipe is causing a problem :

.pipe(
			babel({
				presets: [
					[
						'@babel/preset-env', // Preset to compile your modern JS to ES5.
						{
							targets: { browsers: config.BROWSERS_LIST } // Target browser list to support.
						}
					]
				]
			})
		)