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无法在vue.config.js中配置postcss #3194

@jzz4012650

Description

@jzz4012650

Version

3.2.1

Environment info

  System:
    OS: macOS 10.14.2
    CPU: (8) x64 Intel(R) Core(TM) i7-3615QM CPU @ 2.30GHz
  Binaries:
    Node: 9.11.2 - ~/.nvm/versions/node/v9.11.2/bin/node
    Yarn: 1.5.1 - /usr/local/bin/yarn
    npm: 6.5.0 - ~/.nvm/versions/node/v9.11.2/bin/npm
  Browsers:
    Chrome: 71.0.3578.98
    Firefox: 63.0.3
    Safari: 12.0.2
  npmPackages:
    @vue/babel-preset-app:  3.2.0
    @vue/cli-overlay:  3.2.0
    @vue/cli-plugin-babel: ^3.2.0 => 3.2.0
    @vue/cli-plugin-pwa: ^3.2.0 => 3.2.0
    @vue/cli-service: ^3.2.0 => 3.2.0
    @vue/cli-shared-utils:  3.2.0
    @vue/component-compiler-utils:  2.3.0
    @vue/preload-webpack-plugin:  1.1.0
    @vue/test-utils: ^1.0.0-beta.16 => 1.0.0-beta.26
    @vue/web-component-wrapper:  1.2.0
    babel-helper-vue-jsx-merge-props:  2.0.3
    babel-plugin-transform-vue-jsx:  4.0.1
    eslint-plugin-vue: ^5.0.0-0 => 5.0.0
    vue: ^2.5.21 => 2.5.21 (2.5.18)
    vue-eslint-parser:  4.0.3
    vue-hot-reload-api:  2.3.1
    vue-i18n: ^8.3.2 => 8.4.0
    vue-lazyload:  1.2.3
    vue-loader:  15.4.2
    vue-router: ^3.0.1 => 3.0.2
    vue-style-loader:  4.1.2
    vue-template-compiler: ^2.5.21 => 2.5.21
    vue-template-es2015-compiler:  1.6.0
    vue2-better-scroll: ^1.0.7 => 1.0.7
    vuex: ^3.0.1 => 3.0.1
  npmGlobalPackages:
    @vue/cli: 3.2.1

Steps to reproduce

  1. vue-cli 初始化一个项目
  2. 删除 package.json 中的 postcss 字段
  3. 按照官方文档( https://cli.vuejs.org/guide/css.html#postcss ),在 vue.config.js 中增加 postcss 相关的配置。
  4. postcss 的 autoprefix 没有按照预期生效

What is expected?

根据文档( https://cli.vuejs.org/guide/css.html#postcss )的描述,我应该可以在 vue.config.js 中配置 postcss 相关的配置

What is actually happening?

配置没有生效,追查代码发现判断逻辑有问题,只从 package.json 读取了 postcss 的配置
见:

const hasPostCSSConfig = !!(api.service.pkg.postcss || findExisting(api.resolve('.'), [

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