* should not add polyfills from transform-runtime plugin ([#3730](https://github.com/vuejs/vue-cli/issues/3730)) ([b987969](https://github.com/vuejs/vue-cli/commit/b987969))

`output.libraryExport: 'default'` in `vue.config.js`.

* **ui:** - `file-icon` for the configurations is removed

- Configuration objects `icon` option changed and is now working differently: you can either use a material icon code or a custom image (see Public static files in the UI Plugin docs).

- By default, if no icon is provided for either the config or the task, the corresponding vue-cli plugin logo will be used instead (if any).

* jest is upgraded to 23.1.0 with minor breaking changes

but should not affect normal test cases

While api.version can be useful in general, it's sometimes nice to just declare your version.

This API exposes a simple way to do that.

This API exposes a simple way to declare the required project local `@vue/cli-service` version.

While api.version can be useful in general, it's sometimes nice to just declare your version.

This API exposes a simple way to do that.

Prompts are required to handle user choices when creating a new project or adding a new plugin to the existing one. All prompts logic is stored inside the `prompts.js` file. The prompts are presented using [inquirer](https://github.com/SBoudrias/Inquirer.js) under the hood.

You should export directly array of questions, or export function that return those.

message: 'The locale of project localization.',

validate: input => !!input,

default: 'en'

// ...

]

}

]

if ('@vue/cli-plugin-eslint' in (pkg.devDependencies || {})) {

prompts.push({

type: 'confirm',

When running `vue-cli-service`, environment variables are loaded from all [corresponding files](#environment-variables). If they don't contain a `NODE_ENV` variable, it will be set accordingly. For example, `NODE_ENV` will be set to `"production"` in production mode, `"test"` in test mode, and defaults to `"development"` otherwise.

With `NODE_ENV` set to "test" for example, Vue CLI creates a webpack config that is intended to be used and optimized for unit tests. It doesn't process images and other assets that are unnecessary for unit tests.

console.log(process.env.VUE_APP_SECRET)

除了 `VUE_APP_*` 变量之外，在你的应用代码中始终可用的还有两个特殊的变量：

// Undocumented option of @babel/plugin-transform-runtime.

// When enabled, an absolute path is used when importing a runtime helper atfer tranforming.

// This ensures the transpiled file always use the runtime version required in this package.

// So here we allow user to explicit disable this option if hash consistency is a requirement

// and the runtime version is sure to be correct.

absoluteRuntime = runtimePath

'--url': 'run e2e tests against given url instead of auto-starting dev server',

'--config': 'use custom nightwatch config file (overrides internals)',

'-e, --env': 'specify comma-delimited browser envs to run in (default: chrome)',

'-f, --filter': 'glob to filter tests by filename'

},

details:

// code style consistent with user's selected eslint config.

// Though, if users provided their own `.eslintignore` file, we don't want to

// add our own customized ignore pattern here (in eslint, ignorePattern is

// following the principle of least astonishment.

config.ignorePattern = [

'!.*.js',

}, 'production')

LANGS.forEach(lang => {

const loader = lang === 'css' ? [] : LOADERS[lang]

// does not support mixing config files with loader options.

expect(findLoaders(config2, lang)).toEqual(['vue-style', 'css', 'postcss', 'postcss'].concat(loader))

expect(findOptions(config2, lang, 'css').importLoaders).toBe(3)