gulp-dumber-css-module

Gulp plugin for using CSS Module with dumber bundler.

Usage

// Can be used in chain after gulp-sass, gulp-less and gulp-postcss
const sass = require('gulp-sass');
const cssModule = require('gulp-dumber-css-module');
const gulp = require('gulp');

gulp.src('src/**/*.scss')
  .pipe(sass())
  .pipe(cssModule({ /* options */ }));

Options

gulp-dumber-css-module simply wraps postcss-modules. You can pass all options it supports, except getJSON() which is handled internally by gulp-dumber-css-module.

Background

For CSS foo.css:

.title {
    color: green;
}
.article {
    font-size: 16px;
}

CSS Module turns it into something like

._title_xkpkl_5 {
    color: green;
}
._article_xkpkl_10 {
    font-size: 16px;
}

With a mapping:

{
  "title": "_title_xkpkl_5 _title_116zl_1",
  "article": "_article_xkpkl_10"
}

Interoperable CSS (ICSS) defined that module foo.css should return that mapping object.

module.exports = {
  "title": "_title_xkpkl_5 _title_116zl_1",
  "article": "_article_xkpkl_10"
};

dumber's css-module support

This gulp plugin is very simple, it uses postcss-modules to compile the source css file, then simply add mapping object inside a comment.

The source foo.css vinyl file will be updated with content:

._title_xkpkl_5 {
    color: green;
}
._article_xkpkl_10 {
    font-size: 16px;
}
/* dumber-css-module: {"title": "_title_xkpkl_5 _title_116zl_1", "article": "_article_xkpkl_10"} */

This css file will simply loaded by dumber as a text module text!foo.css.

The real magic happens at runtime. When use load import styles from './foo.css';, the default implementation of ext:css plugin in dumber

1. Load text!foo.css module.
2. Inject CSS content onto HTML head.
3. if dumber-css-module json string is present, put that as the module exports instead of original CSS string.
4. if dumber-css-module json string is not present, put original CSS string as the module exports.

License

MIT.