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README.md
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webpack CLI
The official CLI of webpack
About
webpack CLI provides a flexible set of commands for developers to increase speed when setting up a custom webpack project. As of webpack v4, webpack is not expecting a configuration file, but often developers want to create a more custom webpack configuration based on their use-cases and needs. webpack CLI addresses these needs by providing a set of tools to improve the setup of custom webpack configuration.
How to install
When you have followed the Getting Started guide of webpack then webpack CLI is already installed!
Otherwise
bash npm install --save-dev webpack-cli
or
bash yarn add webpack-cli --dev
Supported arguments and commands
Usage
All interactions with webpack-cli are of the form
bash npx webpack-cli [command] [options]
If no command is specified then bundle command is used by default
Help Usage
To display basic commands and arguments -
bash npx webpack-cli --help
To display all supported commands and arguments -
bash npx webpack-cli --help=verbose
or
bash npx webpack-cli --help verbose
Available Commands
build|bundle|b [entries...] [options] Run webpack (default command, can be omitted). configtest|t [config-path] Validate a webpack configuration. help|h [command] [option] Display help for commands and options. info|i [options] Outputs information about your system. init|create|new|c|n [generation-path] [options] Initialize a new webpack project. loader|l [output-path] [options] Scaffold a loader. plugin|p [output-path] [options] Scaffold a plugin. serve|server|s [entries...] [options] Run the webpack dev server. version|v [commands...] Output the version number of 'webpack', 'webpack-cli' and 'webpack-dev-server' and commands. watch|w [entries...] [options] Run webpack and watch for files changes.
Available Options
Options: -c, --config <value...> Provide path to a webpack configuration file e.g. ./webpack.config.js. --config-name <value...> Name of the configuration to use. -m, --merge Merge two or more configurations using 'webpack-merge'. --disable-interpret Disable interpret for loading the config file. --env <value...> Environment passed to the configuration when it is a function. --node-env <value> Sets process.env.NODE_ENV to the specified value. --define-process-env-node-env <value> Sets process.env.NODE_ENV to the specified value. (Currently an alias for `--node-env`) --analyze It invokes webpack-bundle-analyzer plugin to get bundle information. --progress [value] Print compilation progress during build. -j, --json [value] Prints result as JSON or store it in a file. --fail-on-warnings Stop webpack-cli process with non-zero exit code on warnings from webpack -d, --devtool <value> A developer tool to enhance debugging (false | eval | [inline-|hidden-|eval-][nosources-][cheap-[module-]]source-map). --no-devtool Negative 'devtool' option. --entry <value...> A module that is loaded upon startup. Only the last one is exported. --mode <value> Enable production optimizations or development hints. --name <value> Name of the configuration. Used when loading multiple configurations. -o, --output-path <value> The output directory as **absolute path** (required). --stats [value] Stats options object or preset name. --no-stats Negative 'stats' option. -t, --target <value...> Environment to build for. Environment to build for. An array of environments to build for all of them when possible. --no-target Negative 'target' option. -w, --watch Enter watch mode, which rebuilds on file change. --no-watch Negative 'watch' option. --watch-options-stdin Stop watching when stdin stream has ended. --no-watch-options-stdin Negative 'watch-options-stdin' option. Global options: --color Enable colors on console. --no-color Disable colors on console. -v, --version Output the version number of 'webpack', 'webpack-cli' and 'webpack-dev-server' and commands. -h, --help [verbose] Display help for commands and options.
Checkout [OPTIONS.md](https://github.com/webpack/webpack-cli/blob/master/OPTIONS.md) to see list of all available options.
Exit codes and their meanings
| Exit Code | Description |
|---|---|
| 0 | Success |
| 1 | Errors from webpack |
| 2 | Configuration/options problem or an internal error |
CLI Environment Variables
| Environment Variable | Description |
|---|---|
| WEBPACK_CLI_SKIP_IMPORT_LOCAL | when true it will skip using the local instance of webpack-cli. |
| WEBPACK_CLI_FORCE_LOAD_ESM_CONFIG | when true it will force load the ESM config. |
| WEBPACK_PACKAGE | Use a custom webpack version in CLI. |
| WEBPACK_DEV_SERVER_PACKAGE | Use a custom webpack-dev-server version in CLI. |
| WEBPACK_CLI_HELP_WIDTH | Use custom width for help output. |
Configuration Environment Variables
You can use the following environment variables inside your webpack configuration:
| Environment Variable | Description | ||
|---|---|---|---|
| WEBPACK_SERVE | true if `serve\ | s` is being used. | |
| WEBPACK_BUILD | true if `build\ | bundle\ | b` is being used. |
| WEBPACK_WATCH | true if `--watch\ | watch\ | w` is being used. |
Checkout webpack.js.org for more detailed documentation of webpack-cli.