CSS To Nest

CSS To Nest transforms unnested CSS into nested CSS, following the CSS Nesting Module specification. This might be helpful for updating a project with a single file of legacy CSS.

/* before */
.foo .bar {
	color: blue;
}

.foo .bar .pre.mon {
	color: white;
}

.foo .bar .pre {
	color: red;
}

/* after */
.foo {
	@nest & .bar {
		color: blue;

		@nest & .pre {
			color: red;

			@nest &.mon {
				color: white;
			}
		}
	}
}

Usage

Add CSS To Nest to your build tool:

npm install postcss-to-nest --save-dev

Node

require('postcss-to-nest').process(YOUR_CSS, { /* options */ });

PostCSS

Add PostCSS to your build tool:

npm install postcss --save-dev

Load CSS To Nest as a PostCSS plugin:

postcss([
	require('postcss-to-nest')({ /* options */ })
]).process(YOUR_CSS, /* options */);

Gulp

Add Gulp PostCSS to your build tool:

npm install gulp-postcss --save-dev

Enable CSS To Nest within your Gulpfile:

var postcss = require('gulp-postcss');

gulp.task('css', function () {
	return gulp.src('./src/*.css').pipe(
		postcss([
			require('postcss-to-nest')({ /* options */ })
		])
	).pipe(
		gulp.dest('.')
	);
});

Grunt

Add Grunt PostCSS to your build tool:

npm install grunt-postcss --save-dev

Enable CSS To Nest within your Gruntfile:

grunt.loadNpmTasks('grunt-postcss');

grunt.initConfig({
	postcss: {
		options: {
			use: [
				require('postcss-to-nest')({ /* options */ })
			]
		},
		dist: {
			src: '*.css'
		}
	}
});