less : 解决升级后报错的问题

vue2项目。

上版本。

{
  "name": "xxx",
  "version": "1.0.0",
  "description": "xxx",
  "author": "novel.slientspace.site",
  "private": true,
  "scripts": {
    "dev": "webpack-dev-server --inline --progress --config build/webpack.dev.conf.js",
    "start": "npm run dev",
    "build": "node build/build.js"
  },
  "dependencies": {
    "vue": "^2.5.2",
    "ztree": "^3.5.24"
  },
  "devDependencies": {
    "autoprefixer": "^7.1.2",
    "axios": "^0.18.0",
    "babel-core": "^6.22.1",
    "babel-helper-vue-jsx-merge-props": "^2.0.3",
    "babel-loader": "^7.1.1",
    "babel-plugin-syntax-jsx": "^6.18.0",
    "babel-plugin-transform-runtime": "^6.22.0",
    "babel-plugin-transform-vue-jsx": "^3.5.0",
    "babel-preset-env": "^1.3.2",
    "babel-preset-stage-2": "^6.22.0",
    "chalk": "^2.0.1",
    "copy-webpack-plugin": "^4.0.1",
    "css-loader": "^0.28.0",
    "extract-text-webpack-plugin": "^3.0.0",
    "file-loader": "^1.1.4",
    "friendly-errors-webpack-plugin": "^1.6.1",
    "html-webpack-plugin": "^2.30.1",
    "iview": "^3.2.2",
    "iview-loader": "^1.2.2",
    "jquery": "^3.3.1",
    "less": "^3.0.4",
    "less-loader": "^4.1.0",
    "moment": "^2.24.0",
    "node-notifier": "^5.1.2",
    "optimize-css-assets-webpack-plugin": "^3.2.0",
    "ora": "^1.2.0",
    "portfinder": "^1.0.13",
    "postcss-import": "^11.0.0",
    "postcss-loader": "^2.0.8",
    "postcss-url": "^7.2.1",
    "rimraf": "^2.6.0",
    "semver": "^5.3.0",
    "shelljs": "^0.7.6",
    "uglifyjs-webpack-plugin": "^1.1.1",
    "url-loader": "^0.5.8",
    "vue-loader": "^13.3.0",
    "vue-router": "^3.0.1",
    "vue-style-loader": "^3.0.1",
    "vue-template-compiler": "^2.5.2",
    "vuex": "^3.0.1",
    "webpack": "^3.6.0",
    "webpack-bundle-analyzer": "^2.9.0",
    "webpack-dev-server": "^2.9.1",
    "webpack-merge": "^4.1.0"
  },
  "engines": {
    "node": ">= 6.0.0",
    "npm": ">= 3.0.0"
  },
  "browserslist": [
    "> 1%",
    "last 2 versions",
    "not ie <= 8"
  ]
}

当 less 版本是2.7的时候，不会有什么问题。

但一旦升级到3，就会报错。

解决办法很简单，修改 ./build/utils.js 文件。

...
// 58 - 66行
return {
    css: generateLoaders(),
    postcss: generateLoaders(),
    less: generateLoaders('less',{ javascriptEnabled: true }),
    sass: generateLoaders('sass', { indentedSyntax: true }),
    scss: generateLoaders('sass'),
    stylus: generateLoaders('stylus'),
    styl: generateLoaders('stylus')
  }
...

注意红色的部分，加上这一段就可以了。

以上。