I have configured my gulp file to run certain tasks, and when I run the file I get this error:
AssertionError [ERR_ASSERTION]: Task function must be specified
at Gulp.set [as _setTask]
Here is my code in the gulpfile.js:
'use strict';
var gulp = require('gulp'),
sass = require('gulp-sass'),
browserSync = require('browser-sync');
gulp.task('sass', function () {
return gulp
.src('./css/*.scss')
.pipe(sass().on('error', sass.logError))
.pipe(gulp.dest('./css'));
});
gulp.task('sass:watch', function () {
gulp.watch('./css/*.scss', [ 'sass' ]);
});
gulp.task('browser-sync', function () {
var files = [
'./*.html',
'./css/*.css',
'./js/*.js',
'./img/*.{png, jpg, gif}'
];
browserSync.init(files, {
server: {
baseDir: './'
}
});
});
gulp.task('default', [ 'browser-sync' ], function () {
gulp.start('sass:watch');
});
I think the problem is caused by the syntax I am using with this line:
gulp.task('default', [ 'browser-sync' ], function () {
gulp.start('sass:watch');
});
Can someone help me to solve this problem
Related
I'm using gulp 4, and i have the following gulpfile.js:
'use strict';
var gulp = require('gulp'), del = require('del');
gulp.task('copy-fonts', () => {
return gulp.src(['node_modules/ng/resources/fonts/**/*'])
.pipe(gulp.dest('apps/src/assets/fonts'));
});
gulp.task('clean-copy', () => {
del(['apps/src/assets/fonts']);
});
gulp.task('copy-assets', gulp.series(['clean-copy', 'copy-fonts']), (done) => {
console.log("Gulp is running...");
done();
});
When i run this command: gulp copy-assets, i get the below error:
[11:59:06] The following tasks did not complete: copy-assets
[11:59:06] Did you forget to signal async completion?
In this code:
gulp.task('copy-assets', gulp.series(['clean-copy', 'copy-fonts']), (done) => {
console.log("Gulp is running...");
done();
});
the task has three arguments - that is gulp v3 syntax, not gulp 4. So change that to
gulp.task('copy-assets', gulp.series(['clean-copy', 'copy-fonts'], (done) => {
console.log("Gulp is running...");
done();
));
The done return is now within the gulp.series arguments. Also make this change, I think it will be necessary:
gulp.task('clean-copy', (cb) => {
del(['apps/src/assets/fonts'] );
cb();
});
Iam using gulp CLI version: 2.2.1 Local version: 4.0.2
The node version is 12.16.3
MY code of gulpfile.js is
'use strict';
var gulp = require('gulp'),
sass = require('gulp-sass'),
browserSync = require('browser-sync'),
del=require('del'),
imagemin = require('gulp-imagemin'),
uglify = require('gulp-uglify'),
usemin = require('gulp-usemin'),
rev = require('gulp-rev'),
cleanCss = require('gulp-clean-css'),
flatmap = require('gulp-flatmap'),
htmlmin = require('gulp-htmlmin');
gulp.task('sass', function () {
return gulp.src('./css/*.scss')
.pipe(sass().on('error', sass.logError))
.pipe(gulp.dest('./css'));
});
gulp.task('sass:watch', function () {
gulp.watch('./css/*.scss', ['sass']);
});
gulp.task('browser-sync', function () {
var files = [
'./*.html',
'./css/*.css',
'./img/*.{png,jpg,gif}',
'./js/*.js'
];
browserSync.init(files, {
server: {
baseDir: "./"
}
});
});
// Default task
gulp.task('default', gulp.series('browser-sync', function() {
gulp.start('sass:watch');
}));
gulp.task('clean', function() {
return del(['dist']);
});
gulp.task('copyfonts', function() {
gulp.src('./node_modules/font-awesome/fonts/**/*.{ttf,woff,eof,svg}*')
.pipe(gulp.dest('./dist/fonts'));
});
gulp.task('imagemin', function() {
return gulp.src('img/*.{png,jpg,gif}')
.pipe(imagemin({ optimizationLevel: 3, progressive: true, interlaced: true }))
.pipe(gulp.dest('dist/img'));
});
gulp.task('usemin', function() {
return gulp.src('./*.html')
.pipe(flatmap(function(stream, file){
return stream
.pipe(usemin({
css: [ rev() ],
html: [ function() { return htmlmin({ collapseWhitespace: true })} ],
js: [ uglify(), rev() ],
inlinejs: [ uglify() ],
inlinecss: [ cleanCss(), 'concat' ]
}))
}))
.pipe(gulp.dest('dist/'));
});
gulp.task('build',gulp.series('clean', function() {
gulp.start('copyfonts','imagemin','usemin');
}));
The error I got is after running gulp build on the command line is:
[15:38:33] Starting 'build'...
[15:38:33] Starting 'clean'...
[15:38:33] Finished 'clean' after 69 ms
[15:38:33] Starting '<anonymous>'...
[15:38:33] '<anonymous>' errored after 3.57 ms
[15:38:33] TypeError: gulp.start is not a function
at C:\Users\HARIKA\Desktop\bootstrapassign1\Bootstrap4\conFusion\gulpfile.js
:74:10
[15:38:33] 'build' errored after 83 m
I dont know how to solve the erros. I even changed some of tasks to gulp.series() as per version of gulp version 4. Can anyone help me to resolve the error? Thank you in advance.
Replace these two tasks:
// Default task
gulp.task('default', gulp.series('browser-sync', function() {
gulp.start('sass:watch');
}));
gulp.task('build',gulp.series('clean', function() {
gulp.start('copyfonts','imagemin','usemin');
}));
with:
// Default task
gulp.task('default', gulp.series('browser-sync', 'sass:watch'));
gulp.task('build',gulp.series('clean', 'copyfonts','imagemin','usemin'));
gulp.start is not a part of gulp4+ - it was in v3 although not really sanctioned for use even there.
I had the same issue and perhaps found the solution:
Replace the following:
gulp.task('sass:watch', function () {
gulp.watch('./css/*.scss', ['sass']);
// Default task
gulp.task('default', gulp.series('browser-sync', function() {
gulp.start('sass:watch');
}));
And add instead:
gulp.task('sass:watch', function() {
gulp.watch('./css/*.scss', gulp.series(['sass']));
// Default task
gulp.task('default', gulp.parallel('browser-sync', 'sass:watch'));
From what I have found you will have to use gulp.series and gulp.parallel interchangeably with gulp +4.x
Now for the second part change:
gulp.task('copyfonts', function() {
gulp.src('./node_modules/font-awesome/fonts/**/*.{ttf,woff,eof,svg}*')
.pipe(gulp.dest('./dist/fonts'));
});
Adding return here:
gulp.task('copyfonts', function() {
return gulp.src('./node_modules/font-awesome/fonts/**/*.{ttf,woff,eof,svg}*')
.pipe(gulp.dest('./dist/fonts'));
});
And like shown in the previous answer make the last task:
gulp.task('build', gulp.series('clean','copyfonts','imagemin','usemin'));
Hope this helps!
I'm trying to run sever and I get this assertion error. I've uninstalled node and NPM and reinstalled again also I tried many steps and suggested solutions here but it doesn't fit with my problem.
AssertionError [ERR_ASSERTION]: Task never defined: node_modules/scss/bootstrap.scss
at getFunction (C:\Users\Saviour\Desktop\Portfolio\Bootstrap\Project1\node_modules\undertaker\lib\helpers\normalizeArgs.js:15:5)
at map (C:\Users\Saviour\Desktop\Portfolio\Bootstrap\Project1\node_modules\arr-map\index.js:20:14)
at normalizeArgs (C:\Users\Saviour\Desktop\Portfolio\Bootstrap\Project1\node_modules\undertaker\lib\helpers\normalizeArgs.js:22:10)
at Gulp.series (C:\Users\Saviour\Desktop\Portfolio\Bootstrap\Project1\node_modules\undertaker\lib\series.js:13:14)
at C:\Users\Saviour\Desktop\Portfolio\Bootstrap\Project1\gulpfile.js:7:26
at sass (C:\Users\Saviour\Desktop\Portfolio\Bootstrap\Project1\node_modules\undertaker\lib\set-task.js:13:15)
at bound (domain.js:422:14)
at runBound (domain.js:435:12)
at asyncRunner (C:\Users\Saviour\Desktop\Portfolio\Bootstrap\Project1\node_modules\async-done\index.js:55:18)
at processTicksAndRejections (internal/process/task_queues.js:75:11)
This's my code
var gulp = require('gulp');
var browserSync = require('browser-sync').create();
var sass = require('gulp-sass');
gulp.task('sass', async function () {
return gulp.src(gulp.series('node_modules/scss/bootstrap.scss', 'src/scss/*.scss'))
.pipe(sass())
.pipe(gulp.dest("src/css"))
.pipe(browserSync.stream());
});
gulp.task('js', async function () {
return gulp.src(gulp.series('node_modules/bootstrap/dist/js/bootstrap.min.js', 'node_modules/jquery/dist/jquery.min.js', 'node_modules/popper.js/dist/popper.min.js'))
.pipe(gulp.dest('src/js'))
.pipe(browserSync.stream());
});
gulp.task('serve', async function () {
browserSync.init({
server: "./src",
});
gulp.watch(['node_modules/bootstrap/scss/bootstrap.scss', 'src/scss/*.scss'], 'sass');
gulp.watch("src/*.html").on('change', browserSync.reload);
})
gulp.task('default', gulp.series(gulp.parallel('sass', 'js', 'serve')));
The error is coming from the sass and js tasks. You are wrapping your sources in gulp.series. So Gulp is trying to run your sources as tasks.
They just need to be in an array [] like in the watch task.
Just change:
gulp.task('sass', async function () {
return gulp.src(gulp.series('node_modules/scss/bootstrap.scss', 'src/scss/*.scss'))
to:
gulp.task('sass', async function () {
return gulp.src(['node_modules/scss/bootstrap.scss', 'src/scss/*.scss'])
and then the same format in the js task
The second error (coming from your watch task) is because you need to wrap the tasks you are watching in either series or parallel. Even when theres only one task So change:
gulp.watch(['node_modules/bootstrap/scss/bootstrap.scss', 'src/scss/*.scss'], 'sass');
to:
gulp.watch(['node_modules/bootstrap/scss/bootstrap.scss', 'src/scss/*.scss'], gulp.series('sass'));
Assertion Error using Gulp:
$ gulp scripts
assert.js:42
throw new errors.AssertionError({
^
AssertionError [ERR_ASSERTION]: Task function must be specified
at Gulp.set [as _setTask] (/Users/ThedWord/Documents/my-project/node_modules/undertaker/lib/set-task.js:10:3)
at Gulp.task (/Users/ThedWord/Documents/my-proje
ct/node_modules/undertaker/lib/task.js:13:8)
at Object.<anonymous> (/Users/ThedWord/Documents/my-project/gulpfile.js:10:6)
at Module._compile (module.js:660:30)
at Object.Module._extensions..js (module.js:671:
at Module.load (module.js:573:32)
at tryModuleLoad (module.js:513:12)
at Function.Module._load (module.js:505:3)
at Module.require (module.js:604:17)
at require (internal/module.js:11:18)
/*eslint-env node */
const gulp = require('gulp');
const sass = require('gulp-sass');
const autoprefixer = require('gulp-autoprefixer');
const browserSync = require('browser-sync').create();
const eslint = require('gulp-eslint');
const jasmine = require('gulp-jasmine-phantom');
const concat = require('gulp-concat');
gulp.task('default', ['copy-html', 'copy-images', 'styles', 'lint'], function() {
gulp.watch('sass/**/*.scss', ['styles']);
gulp.watch('js/**/*.js', ['lint']);
gulp.watch('/index.html', ['copy-html']);
gulp.watch('./build/index.html').on('change', browserSync.reload);
});
browserSync.init({
server: './dist'
});
gulp.task('scripts', function(){
gulp.src('js/**/*.js')
.pipe(concat('all.js'))
.pipe(gulp.dest('dist/js'));
});
gulp.task('scripts-dist', function(){
gulp.src('js/**/*.js')
.pipe(concat('all.js'))
.pipe(gulp.dest('dist/js'));
});
gulp.task('copy-html', function() {
gulp.src('./index.html')
.pipe(gulp.dest('./dist'));
});
gulp.task('copy-images', function(){
gulp.src('img/*')
.pipe(gulp.dest('dist/img'));
});
gulp.task('styles', function() {
gulp.src('sass/**/*.scss')
.pipe(sass().on('error', sass.logError))
.pipe(autoprefixer({
browsers: ['last 2 versions']
}))
.pipe(gulp.dest('dist/css'))
.pipe(browserSync.stream());
});
gulp.task('lint', function () {
return gulp.src(['js/**/*.js'])
// eslint() attaches the lint output to the eslint property
// of the file object so it can be used by other modules.
.pipe(eslint())
// eslint.format() outputs the lint results to the console.
// Alternatively use eslint.formatEach() (see Docs).
.pipe(eslint.format())
// To have the process exit with an error code (1) on
// lint error, return the stream and pipe to failOnError last.
.pipe(eslint.failOnError());
});
gulp.task('dist', [
'copy-html',
'copy-images',
'styles',
'lint',
'scripts-dist'
]);
gulp.task('tests', function () {
gulp.src('tests/spec/extraSpec.js')
.pipe(jasmine({
integration: true,
vendor: 'js/**/*.js'
}));
});
The problem you are encountering is that you are running gulp v4.0 using gulp 3 syntax. The AssertionError: Task function must be specified error comes from the fact that gulp.task has changed and the 3 parameters signature was removed. In short, your task below will need to be changed to remove the [] parameter:
gulp.task('default', ['copy-html', 'copy-images', 'styles', 'lint'], function() {
gulp.watch('sass/**/*.scss', ['styles']);
gulp.watch('js/**/*.js', ['lint']);
gulp.watch('/index.html', ['copy-html']);
gulp.watch('./build/index.html').on('change', browserSync.reload);
});
This article will help you migrate to gulp 4 syntax.
If you'd like a simple fix to your problem, without having to make changes to your gulpfile.js, run the following command to downgrade your version of gulp from version 4 to 3.9.1:
npm install gulp#3.9.1 --save
Assuming all goes well you should no longer see the Assertion error.
I have a simple gulpfile.js:
var gulp = require('gulp');
var sass = require('gulp-sass');
var connect = require('gulp-connect');
var imagemin = require('gulp-imagemin');
var notify = require("gulp-notify");
var pngquant = require('imagemin-pngquant');
gulp.task('connect', function() {
connect.server({
root: ['./'],
livereload: true
});
});
gulp.task('sass', function() {
gulp.src(['css/**/*.scss'])
.pipe(sass({
errLogToConsole: false,
onError: function(err) {
return notify().write(err);
}
}))
.pipe(gulp.dest('build'))
.pipe(notify({ message: 'Styles task complete' }))
.pipe(connect.reload());
})
gulp.task('imagemin', function () {
return gulp.src('src/images/*')
.pipe(imagemin({
progressive: true,
svgoPlugins: [{removeViewBox: false}],
use: [pngquant()]
}))
.pipe(gulp.dest('build/images/'));
});
gulp.task('default', function() {
gulp.run('connect', 'sass', 'imagemin');
gulp.watch('css/**', function(event) {
gulp.run('sass');
gulp.run('connect');
})
gulp.watch('*.html', function(event) {
gulp.run('connect');
})
gulp.watch('src/images/*', function(event) {
gulp.run('imagemin');
})
})
gulp.task('start', ['connect']);
Livereload server works fine. However, when I try to edit scss or index.html files I'm getting the following error:
events.js:72
throw er; // Unhandled 'error'
^
Error: listen EADDRINUSE
at errnoException (net.js:904:11)
at Server._listen2 (net.js:1042:14)
at listen (net.js:1064:10)
at Server.listen (net.js:1138:5)
at ConnectApp.server (C:\xampp\htdo
ex.js:57:19)
at new ConnectApp (C:\xampp\htdocs\
js:37:10)
at Object.module.exports.server (C:
connect\index.js:170:12)
at Gulp.gulp.task.gulp.src.pipe.pip
smi2.0\gulpfile.js:10:11)
at module.exports (C:\xampp\htdocs\
rchestrator\lib\runTask.js:34:7)
at Gulp.Orchestrator._runTask (C:\x
de_modules\orchestrator\index.js:273:3)
Whithout gulp-connect everything works fine. I'm sure there is a small syntax error in gulpfile.js but I'm unable to find it. Please help to solve this out.
Here is a final gulpgile.js that works just fine thanx to #Rigotti:
var gulp = require('gulp');
var sass = require('gulp-sass');
var connect = require('gulp-connect');
var imagemin = require('gulp-imagemin');
var notify = require("gulp-notify");
var pngquant = require('imagemin-pngquant');
gulp.task('connect', function() {
connect.server({
root: ['./'],
livereload: true
});
});
gulp.task('sass', function() {
gulp.src(['css/**/*.scss'])
.pipe(sass({
errLogToConsole: false,
onError: function(err) {
return notify().write(err);
}
}))
.pipe(gulp.dest('build'))
.pipe(notify({ message: 'Styles task complete' }))
.pipe(connect.reload());
})
gulp.task('imagemin', function () {
return gulp.src('src/images/*')
.pipe(imagemin({
progressive: true,
svgoPlugins: [{removeViewBox: false}],
use: [pngquant()]
}))
.pipe(gulp.dest('build/images/'));
});
gulp.task('html', function () {
gulp.src('index.html')
.pipe(connect.reload());
});
gulp.task('default', function() {
gulp.run('connect', 'sass', 'imagemin');
gulp.watch('css/**', function(event) {
gulp.run('sass');
})
gulp.watch('*.html', function(event) {
gulp.run('html');
})
gulp.watch('src/images/*', function(event) {
gulp.run('imagemin');
})
})
gulp.task('start', ['connect']);
EADDRINUSE means that the port is already in use.
On the code below you're calling the connect task in default, but connect it's called again when you change your .sass files.
gulp.task('default', function() {
// server started
gulp.run('connect', 'sass', 'imagemin');
gulp.watch('css/**', function(event) {
gulp.run('sass');
gulp.run('connect'); // <-- problem! connect is already running!
});
...
So you're basically trying to listen to the same port you're using, giving you this error.
Remove the gulp.run('connect') inside the watchs and you're good to go.