element-ui/packages/theme-default/gulpfile.js

'use strict';

const gulp = require('gulp');
const postcss = require('gulp-postcss');
const cssmin = require('gulp-cssmin');

const salad = require('postcss-salad')({
  browser: ['ie > 9', 'last 2 version'],
  features: {
    'bem': {
      'shortcuts': {
        'component': 'b',
        'modifier': 'm',
        'descendent': 'e'
      },
      'separators': {
        'descendent': '__',
        'modifier': '--'
      }
    }
  }
});

gulp.task('compile', function() {
  return gulp.src('./src/*.css')
    .pipe(postcss([salad]))
    .pipe(cssmin())
    .pipe(gulp.dest('./lib'));
});

gulp.task('copyfont', function() {
  return gulp.src('./src/fonts/**')
    .pipe(cssmin())
    .pipe(gulp.dest('./lib/fonts'));
});

gulp.task('build', ['compile', 'copyfont']);