@unic/estatico-sass

Transforms Sass to CSS, uses PostCSS (autoprefixer and clean-css) to transform the output

Installation

$ npm install --save-dev @unic/estatico-sass

Usage

const gulp = require('gulp');
const env = require('minimist')(process.argv.slice(2));

/**
 * CSS task
 * Transforms Sass to CSS, uses PostCSS (autoprefixer and clean-css) to transform the output
 *
 * Using `--dev` (or manually setting `env` to `{ dev: true }`) skips minification
 * Using `--watch` (or manually setting `env` to `{ watch: true }`) starts file watcher
 * When combined with `--skipBuild`, the task will not run immediately but only after changes
 *
 * Using `-LLLL` will display debug info like detailed autoprefixer configs
 */
gulp.task('css', () => {
  const task = require('@unic/estatico-sass');
  const estaticoWatch = require('@unic/estatico-watch');
  const nodeSassJsonImporter = require('node-sass-json-importer');
  const autoprefixer = require('autoprefixer');

  const instance = task({
    src: [
      './src/assets/css/**/*.scss',
      './src/preview/assets/css/**/*.scss',
    ],
    srcBase: './src/',
    dest: './dist',
    watch: {
      src: [
        './src/**/*.scss',
      ],
      name: 'css',
      dependencyGraph: {
        srcBase: './',
        resolver: {
          scss: {
            match: /@import[\s-]*["|']?([^"\s(]+).*?/g,
            resolve: (match, filePath) => {
              if (!match[1]) {
                return null;
              }

              // Find possible path candidates
              const candidates = [
                path.dirname(filePath),
                './src/',
                './src/assets/css/',
              ].map((dir) => {
                const partialPath = match[1].replace(path.basename(match[1]), `_${path.basename(match[1])}`);
                const candidatePath = path.resolve(dir, match[1]);
                const candidatePartialPath = path.resolve(dir, partialPath);
                const candidatePaths = [
                  candidatePath,
                  candidatePartialPath,
                  // .scss extension
                  path.extname(candidatePath) ? candidatePath : `${candidatePath}.scss`,
                  path.extname(candidatePartialPath) ? candidatePartialPath : `${candidatePartialPath}.scss`,
                  // .css extension
                  path.extname(candidatePath) ? candidatePath : `${candidatePath}.css`,
                ];

                // Remove duplicates
                return [...new Set(candidatePaths)];
              }).reduce((arr, curr) => arr.concat(curr), []); // Flatten

              return candidates.find(fs.existsSync) || null;
            },
          },
        },
      },
      watcher: estaticoWatch,
    },
    plugins: {
      sass: {
        includePaths: [
          './src/',
          './src/assets/css/',
        ],
        importer: [
          // Add importer being able to deal with json files like colors, e.g.
          nodeSassJsonImporter,
        ],
      },
      postcss: [
        autoprefixer(
          // Either add .browserslistrc to project or specify config in here
        ),
      ],
    },
  }, env);
  
  // Don't immediately run task when skipping build
  if (env.watch && env.skipBuild) {
    return instance;
  }

  return instance();
});

Run task (assuming the project's package.json specifies "scripts": { "gulp": "gulp" }): $ npm run gulp css

See possible flags specified above.

API

plugin(options, env) => taskFn

options

src (required)

Type: Array or String Default: null

Passed to gulp.src.

srcBase (required)

Type: String Default: null

Passed as base option to gulp.src.

dest (required)

Type: String Default: null

Passed to gulp.dest.

watch

Type: Object Default: null

Passed to file watcher when --watch is used.

minifiedSuffix

Type: String Default: .min

Added to the name of minified files.

plugins

Type: Object

plugins.sass

Type: Object Default:

{
  includePaths: null,
}

Passed to node-sass via gulp-sass. includePaths is resolved first since we cannot pass a function there.

plugins.postcss

Type: Array Default:

[
  // Run autoprefixer
  autoprefixer({
    browsers: ['last 1 version'],
  }),
].concat(env.dev ? [] : 
  // Minifiy files with .min in their name, has to correspond to `config.minifiedSuffix`
  filterStream(['**/*', '!**/*.min*'], clean()
))

Passed to gulp-postcss. Setting to null will disable this step.

plugins.clone

Type: Boolean Default: env.ci

If true, every input file will be duplicated (with config.minifiedSuffix added to their name). This allows us to create both minified and unminified versions in one single go.

logger

Type: { info: Function, debug: Function, error: Function } Default: Instance of estatico-utils's Logger utility.

Set of logger utility functions used within the task.

env

Type: Object Default: {}

Result from parsing CLI arguments via minimist, e.g. { dev: true, watch: true }. Some defaults are affected by this, see above.

License

Apache 2.0.