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How to read an external file list with grunt

I'm trying to concatenate and then babelify and uglify files with Grunt.
I'd like to read an external file list, from a file where the files are written one for each line, newline separated.
I'm trying to use the following GruntFile.js, but Grunt says (after I added the src=['<%= jsFiles.toString().split("\n") %>'] line):
Running "browserify:dist1" (browserify) task
Warning: An error occurred while processing a template (Invalid or unexpected token). Use --force to continue.
Where is the error?
This is the GruntFile.js
module.exports = function(grunt) {
grunt.initConfig({
jsFiles: grunt.file.read('scripts/s.list'),
env: {
prod: {
NODE_ENV: 'production'
}
},
browserify: {
dist1: {
options: {
transform: [
['babelify', {presets: ['es2015']}]
]
},
src: ['<%= jsFiles.toString().split("\n") %>'],
dest: '/WebContent/js/libs/s.bundle.js'
},
},
uglify: {
my_target1: {
files: {
'/WebContent/js/libs/s.bundleuglified.js': ['/WebContent/js/libs/s.bundle.js']
}
},
}
});
grunt.loadNpmTasks('grunt-contrib-uglify');
grunt.loadNpmTasks('grunt-contrib-watch');
grunt.loadNpmTasks('grunt-browserify');
grunt.loadNpmTasks('grunt-env');
grunt.registerTask('default', ['release']);
grunt.registerTask('release', ['env', 'browserify', 'uglify']);
};
Edit: I added a backslash to \n and the error has gone, but the babelify task gives me an empty file...
Edit2: I was able to read the file list using the following two lines at the beginning of the GruntFile.js
const jsFiles = grunt.file.read('scripts/s.list');
const jsFilesArray = jsFiles.toString().split("\n");
and then
src: jsFilesArray.slice(0, jsFilesArray.length-1),
because the last element was '' and it gave the error Warning: must provide pattern” as Beniamin H suggested.
Edit3: I found that the babelify task was reading the files in alphabetical order, so I had to first concat them, as explained here, and then babelify and uglify

You don't need to use any '<%= %>'. The file is read synchronously into jsFiles property and it can be used immediately. You may want to specify encoding for grunt.file.read to get a string: https://gruntjs.com/api/grunt.file#grunt.file.read

"No ESLint configuration found" error

Recently, we've upgraded to ESLint 3.0.0 and started to receive the following message running the grunt eslint task:
> $ grunt eslint
Running "eslint:files" (eslint) task
Warning: No ESLint configuration found. Use --force to continue.
Here is the grunt-eslint configuration:
var lintTargets = [
"<%= app.src %>/**/*/!(*test|swfobject)+(.js)",
"test/e2e/**/*/*.js",
"!test/e2e/db/models/*.js"
];
module.exports.tasks = {
eslint: {
files: {
options: {
config: 'eslint.json',
fix: true,
rulesdir: ['eslint_rules']
},
src: lintTargets
}
}
};
What should we do to fix the error?

The error you are facing is because your configuration is not present.
To configure the eslint type
eslint --init
then configure as your requirement.
then execute the project again.

I've had the same error. It seems to need configuration.
Go to your project root & run in terminal
./node_modules/.bin/eslint --init

Try to swap config with configFile. Then :
Create eslint.json file and
Point the right location of it (relative to Gruntfile.js file)
Place some configuration in that file (eslint.json), i.e.:
.
{
"rules": {
"eqeqeq": "off",
"curly": "warn",
"quotes": ["warn", "double"]
}
}
for more examples, go here.

I hade the same problem with Gulp and running "gulp-eslint": "^3.0.1" version.
I had to rename config: to configFile in Gulp task
.pipe(lint({configFile: 'eslint.json'}))

For those having the same problem, this is how we've fixed it.
Following the Requiring Configuration to Run migration procedure, we had to rename eslint.json to .eslintrc.json which is one of the default ESLint config file names now.
We've also removed the config grunt-eslint option.

Create a new file on the root directory called .eslintrc.json file:
{
"parserOptions": {
"ecmaVersion": 6,
"sourceType": "module",
"ecmaFeatures": {
"jsx": true
}
},
"rules": {
"semi": "error"
}
}

Just follow the steps
1.create eslint config file name eslintrc.json
2.place the code as given below
gulp.src(jsFiles)
// eslint() attaches the lint output to the "eslint" property
// of the file object so it can be used by other modules.
.pipe(eslint({configFile: 'eslintrc.json'}))
// 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 failAfterError last.
.pipe(eslint.failAfterError());

Webpack
I had eslint.rc file in my root project directory but event though
I was getting error.
Solution was to add exclude property to "eslint-loader" rule config:
module.exports = {
// ...
module: {
rules: [
{
test: /\.js$/,
exclude: /node_modules/,
loader: "eslint-loader",
options: {
// eslint options (if necessary)
}
},
],
},
// ...
}

We faced this problem today and realized, that the issue was not caused inside the project that we were working on, but inside a package that we had a link on using the command:
yarn link
Which is a feature often useful to test out new features or when trying to debug an issue in a package that manifests itself in another project.
We solved it by either removing the link, or in case of ember.js disabling the developer mode of our addon package.
index.js
module.exports = {
isDevelopingAddon: function() {
return false;
},
...
}

gulp.task('eslint',function(){
return gulp.src(['src/*.js'])
.pipe(eslint())
.pipe(eslint.format())
});
`touch .eslintrc` instead of .eslint
these two steps may help you!

Run the command ember init.
When it asks for overwriting the existing file(s). Type n to skipping overwriting the file.
Now it will automatically create required files like .eslintrc, etc.
For me the same issue occurred when i copied my folder except dist, dist_production and node_modules folder to another system and tried running ember build.

grunt-email-workflow Grunt tasks?

I'm using Lee Munroe's grunt-email-workflow to build out a set of email templates but I am not able to find where are the tasks configured.
When I run "grunt" from the terminal I can see that few tasks are executed:
-clean
-sass
-assemble pages
-juice
etc.
But the Gruntfile.js does not contain anything a part from:
module.exports = function(grunt) {
require('load-grunt-config')(grunt, {
// Pass data to tasks
data: {
// Re-usable filesystem path variables
paths: {
src: 'src',
src_img: 'src/img',
dist: 'dist',
dist_img: 'dist/img',
preview: 'preview'
},
// secrets.json is ignored in git because it contains sensitive data
// See the README for configuration settings
secrets: grunt.file.readJSON('secrets.json')
}
});
};
Am I missing something?

load-grunt-config is auto-loading the required grunt modules located in the package.json of the project. This is where clean (grunt-contrib-clean) sass (grunt-sass) etc are coming from.
This File determines which tasks are run by grunt

GruntJS: Cannot call method filter of undefined

I'm new to grunt and tried installing it on a simple project. It worked but when I try to run 'ugilfy' my files I keep getting this error:
cannot call method 'filter' of undefined'
This is my grunt file (Gruntfile.js), saved in the root of my project:
module.exports = function(grunt)
{
grunt.initConfig({
uglify:
{
options:
{
mangle: true,
compress:true,
sourceMap: "dist/app.map",
banner: "/* 2014 */"
},
//set of files where the plugin works on, (files which we can affect with our plugins like uglify)
// culd be dev or production
target:
{
//folder name equal to the JS object!!!
js: "js/app.js",
dest: "dist/app.min.js"
}
}
});
//load plug-ins
grunt.loadNpmTasks('grunt-contrib-uglify');
};
I seriously have no idea why it is not working. I tried searching on google but I couldn't find any answers.

uglify.target is missing a src property.
Change
js: "js/app.js",
to
src: "js/app.js",
and it should work properly.
More on specifying sources and destinations are in the Grunt docs.

How can I make 'grunt less' automatically run autoprefixer?

I have a working Gruntfile with less and autoprefixer. I also have 'grunt watch' working fine.
Before I was using autoprefixer, I was using less mixins for vendor prefixes. Running 'grunt less' would build working CSS with all my prefixes.
Now I have autoprefixer, but if I want to do a once-off build of my styles, I now have to run 'grunt less' then 'grunt autoprefixer' to get working CSS with prefixes.
How can I modify 'grunt less' so it build working, prefixes less again?
I've read the docs, and I know I could add an additional task to do both these things. However:
'grunt less' now doesn't have usable output. A task should always produce usable output.
I don't want to have to tell other people that 'grunt less' doesn't produce usable output
An additional task should not be required to replace one that doesn't work
I.e., I just want grunt less to produce working CSS (with prefixes).
module.exports = function(grunt) {
// Load Grunt tasks declared in the package.json file
require('matchdep').filterDev('grunt-*').forEach(grunt.loadNpmTasks);
// Configure Grunt
grunt.initConfig({
less: {
development: {
options: {
paths: ["./less"],
yuicompress: false
},
files: {
"./public/css/style.css": "./public/less/style.less"
}
}
},
autoprefixer: {
development: {
browsers: ['last 2 version', 'ie 9'],
expand: true,
flatten: true,
src: 'public/css/*.css',
dest: 'public/css'
}
},
watch: {
less: {
files: ["./public/less/*"],
tasks: ["less", "autoprefixer:development"],
options: {
livereload: true
}
}
},
});
};

For using autoprefixer as plugin for LESS, you must install npm-package less-plugin-autoprefix:
npm install grunt-contrib-less less-plugin-autoprefix --save-dev
Gruntfile.js
module.exports = function(grunt) {
"use strict";
var gruntConfig = {
less : {
options : {
plugins : [ new (require('less-plugin-autoprefix'))({browsers : [ "last 2 versions" ]}) ]
},
main : {
files: {
'src/css/desktop/bootstrap-theme.css' : 'src/less/desktop/bootstrap-theme.less',
'src/css/desktop/company.css' : 'src/less/desktop/company.less',
'src/css/desktop/index.css' : 'src/less/desktop/index.less',
'src/css/desktop/login.css' : 'src/less/desktop/login.less'
}
}
}
};
grunt.initConfig(gruntConfig);
grunt.loadNpmTasks('grunt-contrib-less');
grunt.registerTask('default', [ 'less' ]);
};

Grunt can't do what you describe in the question as tasks do not know about each other inherently. You have to glue tasks together using aliases, (easy) or functions (for when you want a bit more control), but there's no way of modifying the way one of these tasks behaves without changing the source.
As an example, you could fork grunt-contrib-less and add the code to run the auto prefixing directly into the task, around here: https://github.com/gruntjs/grunt-contrib-less/blob/master/tasks/less.js#L69 - inject this line here https://github.com/nDmitry/grunt-autoprefixer/blob/master/tasks/autoprefixer.js#L56 and then use your fork instead of the official plugin.
The easiest and best way is to register a new task that does the job of these two tasks but in the one command, i.e:
grunt.registerTask('buildless', ['less', 'autoprefixer']);
I do this with all my own tasks - SASS compilation, JS concat + uglify, webfont generation etc. Just tell the others in your team to run those tasks and not grunt less or grunt autoprefixer on their own.
Better still, use my Grunt plugin available tasks. With this (and the filter config) you will be able to produce a trimmed down list of tasks whenever someone runs grunt availabletasks although I prefer to alias this with tasks for quicker typing. If you're like me and have been bitten by the automation bug (and have registered loads of plugins in your Gruntfile), this can really help a newcomer to the project with which tasks should be run.