结果图

安装依赖

package.json

{
  ...
  "dependencies": {
    ...
    "element-ui": "^2.13.2",
    ...
  },
  "devDependencies": {
    ...
    "element-theme": "^2.0.1",
  	"element-theme-chalk": "^2.13.2",
    "gulp-autoprefixer": "^7.0.1",
    "gulp-clean-css": "^4.3.0",
    "gulp-load-plugins": "^2.0.3",
    "gulp-rename": "^2.0.0",
    "gulp-sass": "^4.1.0",
    ...
  },
  ...
}

gulp3 需要搭配 node10使用

配置element-theme

/package.json

{
  ...
  "element-theme": {
    "config": "./src/element-ui/theme-variables.scss",
    "out": "./src/element-ui/theme",
    "minimize": true,
    "browsers": [
      "> 1%",
      "last 2 versions",
      "not ie <= 10"
    ]
  },
  ...
}

配置gulp

/gulpfile.js

var gulp = require('gulp')
var $ = require('gulp-load-plugins')()
var fs = require('fs')
var path = require('path')
var del = require('del')
//var colors = require('colors')
var child_process = require('child_process')

var theme = {}
var themeList = require('./src/element-ui/config.js').filter(item => !item.hasBuild)
var styleFileDir = './src/assets/scss'
var styleFileDirTemp = `${styleFileDir}-temp`
var themeFileDir = './public/element-theme'
var et = require('element-theme')
var etOptions = require('./package.json')['element-theme']
var themeFileName = etOptions.config.replace(/.*\/(.+\.scss)/, '$1')

/**
 * 构建生成主题
 */
gulp.task('themes', () => {
  if (themeList.length <= 0) {
    return del(styleFileDirTemp)
  }

  // 删除临时文件，保证本次操作正常执行
  //del(styleFileDirTemp)
  console.log('del(styleFileDirTemp)')

  // 拷贝一份scss样式文件夹，作为构建的临时处理文件夹
  //child_process.spawnSync('cp', ['-r', styleFileDir, styleFileDirTemp])
  console.log('copy styleFileDirTemp')

  // 拷贝element组件scss变量样式文件至临时处理文件夹中，并修改相应配置信息
  //child_process.spawnSync('cp', ['-r', etOptions.config, styleFileDirTemp])
  etOptions.config = `${styleFileDirTemp}/${themeFileName}`

  // 开始构建生成
  fnCreate(themeList)

  function fnCreate(themeList) {
    if (themeList.length >= 1) {
      // 保存当前构建生成的主题对象
      theme = themeList[0]

      console.log('\n')
      console.log('-------------------- 待构建，主题 -------------------------')
      console.log(themeList)
      console.log('\n')
      console.log('-------------------- 构建中，主题 -------------------------')
      console.log(theme)
      console.log('\n')

      // 修改.scss临时文件中的$--color-primary主题变量值
      var data = fs.readFileSync(etOptions.config, 'utf8')
      var result = data.replace(
        /\$--color-primary:(.*) !default;/,
        `$--color-primary:${theme.color} !default;`
      )
      fs.writeFileSync(path.resolve(etOptions.config), result)

      // 修改aui.scss临时文件中引入element组件主题变量文件路径
      var data = fs.readFileSync(`${styleFileDirTemp}/aui.scss`, 'utf8')
      var result = data.replace(new RegExp(`(@import \")(.*\/)(${themeFileName}\";)`), '$1./$3')
      fs.writeFileSync(path.resolve(`${styleFileDirTemp}/aui.scss`), result)

      // 调用element-theme插件，生成element组件主题
      etOptions.out = `${themeFileDir}/${theme.name}`
      et.run(etOptions, () => {
        // 生成后，构建同主题色aui.css项目主题
        gulp.start(['styles'], () => {
          // 递归下一步
          themeList.splice(0, 1)
          fnCreate(themeList)
        })
      })
    } else {
      // 删除临时文件
      del(styleFileDirTemp)
      console.log('\n')
      console.log('-------------------- 构建完毕，删除临时文件 -------------------------')
      console.log(styleFileDirTemp)
      console.log('\n')

      // 删除主题不需要的部分文件
      var files = [
        `${themeFileDir}/**/*.css`,
        `!${themeFileDir}/**/index.css`,
        `!${themeFileDir}/**/aui.css`,
        `!${themeFileDir}/**/fonts`
      ]
      del(files)
      console.log('-------------------- 构建完毕，删除主题独立组件文件 -------------------------')
      console.log(files)
      console.log('\n')
    }
  }
})

gulp.task('styles', () => {
  return gulp
    .src([`${styleFileDirTemp}/aui.scss`])
    .pipe($.sass().on('error', $.sass.logError))
    .pipe(
      $.autoprefixer({
        browsers: etOptions.browsers,
        cascade: false
      })
    )
    .pipe($.cleanCss())
    .pipe($.rename('aui.css'))
    .pipe(gulp.dest(`${themeFileDir}/${theme.name}`))
})