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2 changes: 1 addition & 1 deletion .github/CONTRIBUTING.md
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### Plugin Development

See [dedicated section in docs](https://github.com/vuejs/vue-cli/tree/dev/docs/Plugin.md).
See [dedicated section in docs](https://github.com/vuejs/vue-cli/tree/dev/docs/plugin.md).
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# WIP
## Table of Contents

- [Introduction](#introduction)
- [CLI](#cli)
- [CLI Service](#cli-service)
- [Configuration](#configuration)
- [webpack](#webpack)
- [browserslist](#browserslist)
- [Babel](#babel)
- [CSS](#css)
- [ESLint](#eslint)
- [TypeScript](#typescript)
- [Unit Testing](#unit-testing)
- [E2E Testing](#e2e-testing)
- [Environment Variables and Modes](#environment-variables-and-modes)
- [Development](#development)

## Introduction

## The CLI
Vue CLI is a full system for rapid Vue.js development, providing:

- Interactive project scaffolding via `@vue/cli`.
- Zero config rapid prototyping via `@vue/cli` + `@vue/cli-service-global`.
- A runtime dependency (`@vue/cli-service`) that is:
- Upgradeable;
- Built on top of webpack, with sensible defaults;
- Configurable via in-project config file;
- Extensible via plugins
- A rich collection of official plugins integrating the best tools in the frontend ecosystem.

Vue CLI aims to be the standard tooling baseline for the Vue ecosystem. It ensures the various build tools work smoothly together with sensible defaults so you can focus on writing your app instead of spending days wrangling with configurations. At the same time, it still offers the flexibility to tweak the config of each tool without the need for ejecting.

## CLI

The CLI is installed globally and provides the `vue` command in your terminal:

``` sh
npm install -g @vue/cli
vue create my-project
```

For full details on what the `vue` command can do, see the [full CLI docs](https://github.com/vuejs/vue-cli/blob/dev/packages/%40vue/cli/README.md).

## CLI Service

`@vue/cli-service` is a dependency installed locally into every project created by `@vue/cli`. It contains the core service that loads other plugins, resolves the final webpack config, and provides the `vue-cli-service` binary to your project. The binary exposes commands such as `vue-cli-service serve`, which can be used in npm scripts. If you are familiar with [create-react-app](https://github.com/facebookincubator/create-react-app), `@vue/cli-service` is essentially the equivalent of `react-scripts`, but more flexible.

## Configuration

### Vue CLI options
Projects created from `vue create` are ready to go out-of-the-box. The plugins are designed to work with one another so in most cases, all you need to do is pick the features you want during the interactive prompts.

However, we also understand that it's impossible to cater to every possible need, and the need of a project may also change over time. Projects created by Vue CLI allows you to configure almost every aspect of the tooling without ever needing to eject.

### vue.config.js

Many aspects of a Vue CLI project can be configured by placing a `vue.config.js` file at the root of your project. The file may already exist depending on the features you selected when creating the project.

`vue.config.js` should export an object, for example:

``` js
// vue.config.js
module.exports = {
lintOnSave: true
}
```

Check [here](./config.md) for full list of possible options.

### webpack

### Modes and Environment Variables
Probably the most common configuration need is tweaking the internal webpack config. Vue CLI provides flexible ways to achieve that without ejecting.

### Webpack
See [here](./webpack.md) for full details.

- #### Basic Configuration
### browserlist

- #### Chaining
You will notice a `browserlist` field in `package.json` specifying a range of browsers the project is targeting. This value will be used by `babel-preset-env` and `autoprefixer` to automatically determine the JavaScript polyfills and CSS vendor prefixes needed.

- #### Using Resolved Config as a File
See [here](https://github.com/ai/browserslist) for how to specify browser ranges.

### Babel

- link to: babel preset
- link to: babel plugin
Babel can be configured via `.babelrc` or the `babel` field in `package.json`.

### CSS
All Vue CLI apps use `@vue/babel-preset-app` by default, which includes:

- [babel-preset-env](https://github.com/babel/babel/tree/master/packages/babel-preset-env)
- [dynamic import syntax](https://github.com/tc39/proposal-dynamic-import)
- [Object rest spread](https://github.com/tc39/proposal-object-rest-spread)
- [babel-preset-stage-2](https://github.com/babel/babel/tree/master/packages/babel-preset-stage-2)
- Vue JSX support

- #### PostCSS
See [@vue/babel-preset-app](https://github.com/vuejs/vue-cli/tree/dev/packages/%40vue/babel-preset-app) for preset options.

### CSS

- #### CSS Modules
Vue CLI projects comes with support for [PostCSS](http://postcss.org/), [CSS Modules](https://github.com/css-modules/css-modules) and pre-processors including [Sass](https://sass-lang.com/), [Less](http://lesscss.org/) and [Stylus](http://stylus-lang.com/).

- #### Other Pre-Processors
See [here](./css.md) for more details on CSS related configurations.

### ESLint

- link to: eslint plugin
ESLint can be configured via `.eslintrc` or `eslintConfig` field in `package.json`.

See [@vue/cli-plugin-eslint](https://github.com/vuejs/vue-cli/tree/dev/packages/%40vue/cli-plugin-eslint) for more details.

### TypeScript

- link to: typescript plugin
TypeScript can be configured via `tsconfig.json`.

See [@vue/cli-plugin-typescript](https://github.com/vuejs/vue-cli/tree/dev/packages/%40vue/cli-plugin-typescript) for more details.

### Unit Testing

- #### Jest

See [@vue/cli-plugin-unit-jest](https://github.com/vuejs/vue-cli/tree/dev/packages/%40vue/cli-plugin-unit-jest) for more details.

- #### Mocha (via `mocha-webpack`)

See [@vue/cli-plugin-unit-mocha](https://github.com/vuejs/vue-cli/tree/dev/packages/%40vue/cli-plugin-unit-mocha) for more details.

### E2E Testing

- #### Cypress

See [@vue/cli-plugin-e2e-cypress](https://github.com/vuejs/vue-cli/tree/dev/packages/%40vue/cli-plugin-e2e-cypress) for more details.

- #### Nightwatch

See [@vue/cli-plugin-e2e-nightwatch](https://github.com/vuejs/vue-cli/tree/dev/packages/%40vue/cli-plugin-e2e-nightwatch) for more details.

## Environment Variables and Modes

It is a common need to customize the app's behavior based on the target environment - for example, you may want the app to use different API endpoints or credentials during development / staging / production environments.

Vue CLI has comprehensive support for specifying different environment variables - see the [dedicated section](./env.md) for more details.

## Development

- [Contributing Guide](https://github.com/vuejs/vue-cli/blob/dev/.github/CONTRIBUTING.md)
- [Plugin Development Guide](https://github.com/vuejs/vue-cli/blob/dev/docs/plugin.md).
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## `vue.config.js`

Here are all the available options with default values (all optional):

``` js
module.exports = {
// Project deployment base
// By default we assume your app will be deployed at the root of a domain,
// e.g. https://www.my-app.com/
// If your app is deployed at a sub-path, you will need to specify that
// sub-path here. For example, if your app is deployed at
// https://www.foobar.com/my-app/
// then change this to '/my-app/'
baseUrl: '/',

// where to output built files
outputDir: 'dist',

// whether to use eslint-loader for lint on save.
lintOnSave: false,

// use the full build with in-browser compiler?
// https://vuejs.org/v2/guide/installation.html#Runtime-Compiler-vs-Runtime-only
compiler: false,

// tweak internal webpack configuration.
// see https://github.com/vuejs/vue-cli/blob/dev/docs/webpack.md
chainWebpack: () => {},
configureWebpack: () => {},

// vue-loader options
// https://vue-loader.vuejs.org/en/options.html
vueLoader: {},

// generate sourceMap for production build?
productionSourceMap: true,

// CSS related options
css: {
// extract CSS in components into a single CSS file (only in production)
extract: true,

// enable CSS source maps?
sourceMap: false,

// pass custom options to pre-processor loaders. e.g. to pass options to
// sass-loader, use { sass: { ... } }
loaderOptions: {},

// Enable CSS modules for all css / pre-processor files.
// This option does not affect *.vue files.
modules: false
},

// use thread-loader for babel & TS in production build
// enabled by default if the machine has more than 1 cores
parallel: require('os').cpus().length > 1,

// split vendors using autoDLLPlugin?
// can also be an explicit Array of dependencies to include in the DLL chunk.
dll: false,

// options for the PWA plugin.
// see https://github.com/vuejs/vue-cli/tree/dev/packages/%40vue/cli-plugin-pwa
pwa: {},

// configure webpack-dev-server behavior
devServer: {
open: process.platform === 'darwin',
host: '0.0.0.0',
port: 8080,
https: false,
hotOnly: false,
proxy: null, // string | Object
before: app => {}
},

// options for 3rd party plugins
pluginOptions: {
// ...
}
}
```
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## CSS

### PostCSS

Vue CLI uses PostCSS internally, and enables [autoprefixer](https://github.com/postcss/autoprefixer) by default. You can configure PostCSS via `.postcssrc` or any config source supported by [postcss-load-config](https://github.com/michael-ciniawsky/postcss-load-config).

### CSS Modules

You can [use CSS Modules in `*.vue` files](https://vue-loader.vuejs.org/en/features/css-modules.html) out of the box with `<style module>`.

As for standalone style files, any files ending with `.module.(css|sass|scss|less|styl|stylus)` will be processed as CSS modules.

If you wish to be able to use CSS modules without the `.module` postfix, you can set `css: { modules: true }` in `vue.config.js`. This option does not affect `*.vue` files.

### Pre-Processors

You can select pre-processors (Sass/Less/Stylus) when creating the project. If you did not do so, you can also just manually install the corresponding webpack loaders. The loaders are pre-configured and will automatically be picked up. For example, to add SASS to an existing project, simply run:

``` sh
npm install -D sass-loader node-sass
```

Then you can import `.scss` files, or use it in `*.vue` files with:

``` vue
<style lang="scss">
$color = red;
</style>
```

### Passing Options to Pre-Processor Loaders

Sometimes you may want to pass options to the pre-processor's webpack loader. You can do that using the `css.loaderOptions` option in `vue.config.js`. For example, to pass some shared global variables to all your Sass styles:

``` js
// vue.config.js
const fs = require('fs')

module.exports = {
css: {
loaderOptions: {
sass: {
data: fs.readFileSync('src/variables.scss', 'utf-8')
}
}
}
}
```
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## Environment Variables and Modes

You can specify env variables by placing the following files in your project root:

``` sh
.env # loaded in all cases
.env.local # loaded in all cases, ignored by git
.env.[mode] # only loaded in specified mode
.env.[mode].local # only loaded in specified mode, ignored by git
```

An env file simply contains key=value pairs of environment variables:

```
FOO=bar
VUE_APP_SECRET=secret
```

Loaded variables will become available to all `vue-cli-service` commands, plugins and dependencies.

### Modes

**Mode** is an important concept in Vue CLI projects. By default, there are three modes in a Vue CLI project:

- `development` is used by `vue-cli-service serve`
- `production` is used by `vue-cli-service build`
- `test` is used by `vue-cli-service test`

Note that a mode is different from `NODE_ENV`, as a mode can contain multiple environment variables. That said, each mode does set `NODE_ENV` to the same value by default - for example, `NODE_ENV` will be set to `"development"` in development mode.

You can set environment variables only available to a certain mode by postfixing the `.env` file. For example, if you create a file named `.env.development` in your project root, then the variables declared in that file will only be loaded in development mode.

### Using Env Variables in Client-side Code

Only variables that start with `VUE_APP_` will be statically embedded into the client bundle with `webpack.DefinePlugin`. You can access them in your application code:

``` js
console.log(process.env.VUE_APP_SECRET)
```

During build, `process.env.VUE_APP_SECRET` will be replaced by the corresponding value. In the case of `VUE_APP_SECRET=secret`, it will be replaced by `"secret"`.

In addition to `VUE_APP_*` variables, there are also two special variables that will always be available in your app code:

- `NODE_ENV` - this will be one of `"development"`, `"production"` or `"test"` depending on the [mode](#modes) the app is running in.
- `BASE_URL` - this corresponds to the `baseUrl` option in `vue.config.js` and is the base path your app is deployed at.

### Local Variables

Sometimes you might have env variables that should not be committed into the codebase, especially if your project is hosted in a public repository. In that case you should use an `.env.local` file instead. Local env files are ignored in `.gitignore` by default.

`.local` can also be appended to mode-specific env files, for example `.env.development.local` will be loaded during development, and is ignored by git.
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# WIP

### Basic Configuration

### Chaining

### Using Resolved Config as a File
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# @vue/cli

## Usage

``` sh
npm install -g @vue/cli
vue create my-app
vue create my-project
```

[Full Docs](https://github.com/vuejs/vue-cli/tree/dev/docs)

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