@redsift/redsift-bundler
Bundle your ES2015/Stylus/CSS application for distribution.
Last updated 2 years ago by martinhecher .
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redsift-bundler

redsift-bundler is a collection of functionality which takes care of the bundling and building process of a Javascript ES2015 application. It supports

  • bundling of an ES2015 Javascript application/library into a single ES2015 file for distribution
  • the creation of a ES5 version of the bundler
  • the creation of a single CSS file from a set of CSS or Stylus files (with support for creating multiple CSS themes easily).

redsift-bundler comes in two flavours. You can either use it as a standalone tool which makes it easy to quickly build an app/lib from the command line. The standalone tool can also be integrated into your NPM workflow e.g. as npm build command.

The second, more flexible alternative is to integrate the bundling functionaltiy via the Gulp build tool. Simply use our handy Gulp tasks directly in your gulpfile.

The setup of the distribution bundle is done in a single configuration file for the standalone usage, as well as for using the gulp tasks. See below on how to configure your application/library.

The idea of this bundler is to have a central tool which takes care of the repetitive task of creating distribution bundles from a Javascript application/library. Maintaining the build process of many different Javascript projects e.g. with a gulpfile becomes tedious when you enhance or fix something, because every gulpfile in each repository has to be updated. The redsift-bundler solves this problem. Include it in your project as NPM module and simply update the module, if necessary.

Installation

If you are using the bundler on the command line install it globally:

npm install -g @redsift/redsift-bundler

When using it directly with gulp do a project local installation:

npm install --save-dev @redsift/redsift-bundler

Command line usage

Usage: redsift-bundler -c [config-file]

Options:
  -c  Bundle configuration file [required]

CAUTION: For the redsift-bundler executable to exist it has to be installed globally before!

The bundler needs a configuration file which is oriented very close to the configuration properties of Rollup. Have a look at Rollup's documentation to understand the used options in detail.

Usage as NPM command

To be able to run the bundler as NPM command add the following configuration to your package.json file within the script section:

"scripts": {
    "build": "redsift-bundler -c ./bundle.config.js",
    ...
  }

If you prefer not to use the globally installed version of the bundler for the NPM command install it locally first and use this configuration:

"scripts": {
    "build": "./node_modules/@redsift/redsift-bundler -c ./bundle.config.js",
    ...
  }

This allows you to call

npm run build

in the project folder to create the bundle(s).

Using the gulp tasks directly (fastest and most flexible)

If you already have a Gulpfile (or simply want to use Gulp instead of the standalone bundler) add the following lines to your gulpfile:

var RSBundler = require('@redsift/redsift-bundler');
var bundleConfig = require('./bundle.config.js');

gulp.task('bundle-js', RSBundler.loadTask(gulp, 'bundle-js', bundleConfig));
gulp.task('bundle-css', RSBundler.loadTask(gulp, 'bundle-css', bundleConfig));

gulp.task('build', ['bundle-js', 'bundle-css'], function() {
  console.log('\n* Bundling complete:\n');
  RSBundler.printBundleSummary(bundleConfig);
});

RSBundler takes care of loading the two tasks for bundling Javascript (bundle-js) and CSS (bundle-css) and sets them up with the bundleConfig. gulp build will run both tasks and prints a bundle summary after a successful build.

Configuration file

This example configuration file takes the ES2015 Javascript file ./src/js/index.js and the Stylus file ./src/styles/index.styl and outputs the bundled files into ./dist/mybundle. The folder will contain a js and a css sub folder with the bundled files and outputs a non-minified and a minified version of the bundle together with sourcemaps. If your are bundling a library the exported Javascript functionality will be accessible via the global variable window.MyBundle after importing the bundle.

var paths = {
  dest: './dist'
}

// We create a single bundle:
var myBundleConfig = {
  // the Javascript index file. Output Javascript will be written to a file with the given 'name' within 'outputFolder/js'
  mainJS: {
    name: 'mybundle',
    indexFile: './src/js/index.js'
  },  
  // the CSS/Stylus index file. Output CSS will be written to a file with the given 'name' within 'outputFolder/css'
  // multiple output files can be created, e.g. to create multiple CSS themes (see the real-world example below)
  styles: [{
    name: 'mybundle',
    indexFile: './src/index.styl'
  }],
  // list of formats which are going to be created. Valid formats are described in the Rollup documentation
  formats: ['es6', 'umd'],
  // the output folder of the bundle
  outputFolder: paths.dest,
  // the module name that the exported JS code will be accessible at in the global namespace. Used by 'umd' and 'cjs' export formats (no function for 'es6' export)
  moduleNameJS: 'MyBundle',
  // The destination of the sourcemaps relative to 'outputFolder'
  mapsDest: '.',
  // external mappings allow you to exclude the bundling of the named libraries. See the 'real world' example and the
  // Rollup documentation regarding this option. For the simple example we are including everything into the bundle, so
  // there is no need for that here.
  externalMappings: {
    // 'd3': 'd3'
  }
};

// export the config as array. Multiple bundles can be defined (see real-world example below)
module.exports = [ myBundleConfig ];

For a another simple example have a look at the @redsift/ui-rs-core repository.

A real world example with multiple bundles, multiple themes and external mappings is available in the @redsift/redsift-ui repository.

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