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grunt-contrib-concat
Advanced tools
The grunt-contrib-concat package is a Grunt plugin used to concatenate files. It is commonly used in build processes to combine multiple files into a single file, which can help reduce the number of HTTP requests and improve load times for web applications.
Concatenate JavaScript files
This feature allows you to concatenate multiple JavaScript files into a single file. The 'separator' option specifies the string to use between each file in the concatenated output.
{
"concat": {
"options": {
"separator": ";\n"
},
"dist": {
"src": ["src/js/file1.js", "src/js/file2.js"],
"dest": "dist/js/bundle.js"
}
}
}
Concatenate CSS files
This feature allows you to concatenate multiple CSS files into a single file. This can be useful for reducing the number of CSS files that need to be loaded by the browser.
{
"concat": {
"css": {
"src": ["src/css/style1.css", "src/css/style2.css"],
"dest": "dist/css/styles.css"
}
}
}
Custom banner and footer
This feature allows you to add a custom banner at the beginning and a footer at the end of the concatenated file. This can be useful for adding comments or metadata to the output file.
{
"concat": {
"options": {
"banner": "/* My Project - concatenated on <%= grunt.template.today('yyyy-mm-dd') %> */\n",
"footer": "\n/* End of concatenated files */"
},
"dist": {
"src": ["src/js/file1.js", "src/js/file2.js"],
"dest": "dist/js/bundle.js"
}
}
}
gulp-concat is a Gulp plugin that concatenates files. It is similar to grunt-contrib-concat but is used within the Gulp task runner ecosystem. Gulp's streaming build system can be more flexible and faster for certain tasks compared to Grunt.
broccoli-concat is a Broccoli plugin for concatenating files. It is used within the Broccoli build tool, which is known for its fast rebuild times and efficient file watching. This makes it a good alternative for projects that use Broccoli instead of Grunt.
webpack-concat-plugin is a Webpack plugin that concatenates files. It integrates with Webpack's module bundling system, making it a good choice for projects that use Webpack for their build process. It offers more advanced features like dependency resolution and code splitting.
Concatenate files.
This plugin requires Grunt ~0.4.0
If you haven't used Grunt before, be sure to check out the Getting Started guide, as it explains how to create a Gruntfile as well as install and use Grunt plugins. Once you're familiar with that process, you may install this plugin with this command:
npm install grunt-contrib-concat --save-dev
One the plugin has been installed, it may be enabled inside your Gruntfile with this line of JavaScript:
grunt.loadNpmTasks('grunt-contrib-concat');
Run this task with the grunt concat
command.
Task targets, files and options may be specified according to the grunt Configuring tasks guide.
Type: String
Default: linefeed
Concatenated files will be joined on this string. If you're post-processing concatenated JavaScript files with a minifier, you may need to use a semicolon ';'
as the separator.
Type: String
Default: empty string
This string will be prepended to the beginning of the concatenated output. It is processed using grunt.template.process, using the default options.
(Default processing options are explained in the grunt.template.process documentation)
Type: Boolean
Object
Default: false
Strip JavaScript banner comments from source files.
false
- No comments are stripped.true
- /* ... */
block comments are stripped, but NOT /*! ... */
comments.options
object:
true
were specified.block
- If true, all block comments are stripped.line
- If true, any contiguous leading //
line comments are stripped.Type: Boolean
Object
Default: false
Process source files as templates before concatenating.
false
- No processing will occur.true
- Process source files using grunt.template.process defaults.options
object - Process source files using grunt.template.process, using the specified options.(Default processing options are explained in the grunt.template.process documentation)
In this example, running grunt concat:dist
(or grunt concat
because concat
is a [multi task][]) will concatenate the three specified source files (in order), joining files with ;
and writing the output to dist/built.js
.
// Project configuration.
grunt.initConfig({
concat: {
options: {
separator: ';'
},
dist: {
src: ['src/intro.js', 'src/project.js', 'src/outro.js'],
dest: 'dist/built.js'
}
}
});
In this example, running grunt concat:dist
will first strip any preexisting banner comment from the src/project.js
file, then concatenate the result with a newly-generated banner comment, writing the output to dist/built.js
.
This generated banner will be the contents of the banner
template string interpolated with the config object. In this case, those properties are the values imported from the package.json
file (which are available via the pkg
config property) plus today's date.
Note: you don't have to use an external JSON file. It's also valid to create the pkg
object inline in the config. That being said, if you already have a JSON file, you might as well reference it.
// Project configuration.
grunt.initConfig({
pkg: grunt.file.readJSON('package.json'),
concat: {
options: {
stripBanners: true,
banner: '/*! <%= pkg.name %> - v<%= pkg.version %> - ' +
'<%= grunt.template.today("yyyy-mm-dd") %> */'
},
dist: {
src: ['src/project.js'],
dest: 'dist/built.js'
}
}
});
In this example, running grunt concat
will build two separate files. One "basic" version, with the main file essentially just copied to dist/basic.js
, and another "with_extras" concatenated version written to dist/with_extras.js
.
While each concat target can be built individually by running grunt concat:basic
or grunt concat:extras
, running grunt concat
will build all concat targets. This is because concat
is a [multi task][].
// Project configuration.
grunt.initConfig({
concat: {
basic: {
src: ['src/main.js'],
dest: 'dist/basic.js'
},
extras: {
src: ['src/main.js', 'src/extras.js'],
dest: 'dist/with_extras.js'
}
}
});
Like the previous example, in this example running grunt concat
will build two separate files. One "basic" version, with the main file essentially just copied to dist/basic.js
, and another "with_extras" concatenated version written to dist/with_extras.js
.
This example differs in that both files are built under the same target.
Using the files
object, you can have list any number of source-destination pairs.
// Project configuration.
grunt.initConfig({
concat: {
basic_and_extras: {
files: {
'dist/basic.js': ['src/main.js'],
'dist/with_extras.js': ['src/main.js', 'src/extras.js']
}
}
}
});
Filenames can be generated dynamically by using <%= %>
delimited underscore templates as filenames.
In this example, running grunt concat:dist
generates a destination file whose name is generated from the name
and version
properties of the referenced package.json
file (via the pkg
config property).
// Project configuration.
grunt.initConfig({
pkg: grunt.file.readJSON('package.json'),
concat: {
dist: {
src: ['src/main.js'],
dest: 'dist/<%= pkg.name %>-<%= pkg.version %>.js'
}
}
});
In this more involved example, running grunt concat
will build two separate files (because concat
is a [multi task][]). The destination file paths will be expanded dynamically based on the specified templates, recursively if necessary.
For example, if the package.json
file contained {"name": "awesome", "version": "1.0.0"}
, the files dist/awesome/1.0.0/basic.js
and dist/awesome/1.0.0/with_extras.js
would be generated.
// Project configuration.
grunt.initConfig({
pkg: grunt.file.readJSON('package.json'),
dirs: {
src: 'src/files',
dest: 'dist/<%= pkg.name %>/<%= pkg.version %>'
},
concat: {
basic: {
src: ['<%= dirs.src %>/main.js'],
dest: '<%= dirs.dest %>/basic.js'
},
extras: {
src: ['<%= dirs.src %>/main.js', '<%= dirs.src %>/extras.js'],
dest: '<%= dirs.dest %>/with_extras.js'
}
}
});
Task submitted by "Cowboy" Ben Alman
This file was generated on Mon Feb 18 2013 08:36:44.
FAQs
Concatenate files.
The npm package grunt-contrib-concat receives a total of 192,848 weekly downloads. As such, grunt-contrib-concat popularity was classified as popular.
We found that grunt-contrib-concat demonstrated a not healthy version release cadence and project activity because the last version was released a year ago. It has 6 open source maintainers collaborating on the project.
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