vant-weapp/scripts/utils/build.js

const gulp = require('gulp');
const postcss = require('gulp-postcss');
const cssmin = require('gulp-clean-css');
const rename = require('gulp-rename');
const gutil = require('gulp-util');
const removeLogging = require('gulp-remove-logging');
const babel = require('gulp-babel');

const options = gutil.env;
const isProduction = process.env.NODE_ENV === 'production';

gulp.task('compile-css', () => {
  return gulp.src(['../../packages/**/*.pcss', '!../../packages/**/_*.pcss'])
    .pipe(postcss())
    .pipe(cssmin())
    .pipe(rename((path) => {
      path.extname = '.wxss';
    }))
    .pipe(gulp.dest(options.dist));
});

gulp.task('compile-js', () => {
  return gulp.src(['../../packages/**/*.js'])
    .pipe(removeLogging({
      methods: isProduction ? ['log', 'info'] : []
    }))
    .pipe(babel({
      plugins: [['transform-object-rest-spread', { useBuiltIns: true }]],
      presets: [
        ['env', {
          loose: true,
          useBuiltIns: true,
          exclude: ['transform-es2015-typeof-symbol']
        }]
      ]
    }))
    .pipe(gulp.dest(options.dist));
});

gulp.task('build', ['compile-css', 'compile-js']);