Other Options

These are the remaining configuration options supported by webpack.

Help Wanted: This page is still a work in progress. If you are familiar with any of the options for which the description or examples are incomplete, please create an issue and submit a PR at the docs repo!

amd

object boolean: false

Set the value of require.amd or define.amd. Setting amd to false will disable webpack's AMD support.

webpack.config.js

module.exports = {
  //...
  amd: {
    jQuery: true
  }
};

Certain popular modules written for AMD, most notably jQuery versions 1.7.0 to 1.9.1, will only register as an AMD module if the loader indicates it has taken special allowances for multiple versions being included on a page.

The allowances were the ability to restrict registrations to a specific version or to support different sandboxes with different defined modules.

This option allows you to set the key your module looks for to a truthy value. As it happens, the AMD support in webpack ignores the defined name anyways.

bail

boolean = false

Fail out on the first error instead of tolerating it. By default webpack will log these errors in red in the terminal, as well as the browser console when using HMR, but continue bundling. To enable it:

webpack.config.js

module.exports = {
  //...
  bail: true
};

This will force webpack to exit its bundling process.

cache

boolean object

Cache the generated webpack modules and chunks to improve build speed. Caching will be automatically enabled by default while in watch mode and webpack is set to mode development. To enable caching manually set it to true:

webpack.config.js

module.exports = {
  //...
  cache: false
};

If an object is passed, webpack will use this object for caching. Keeping a reference to this object will allow one to share the same cache between compiler calls:

webpack.config.js

let SharedCache = {};

module.exports = {
  //...
  cache: SharedCache
};

Don't share the cache between calls with different options.

Elaborate on the warning and example - calls with different configuration options?

loader

object

Expose custom values into the loader context.

Add an example...

parallelism

number = 100

Limit the number of parallel processed modules. Can be used to fine tune performance or to get more reliable profiling results.

profile

boolean

Capture a "profile" of the application, including statistics and hints, which can then be dissected using the Analyze tool.

Use the StatsPlugin for more control over the generated profile.

Combine with parallelism: 1 for better results.

recordsPath

string

Use this option to generate a JSON file containing webpack "records" -- pieces of data used to store module identifiers across multiple builds. You can use this file to track how modules change between builds. To generate one, simply specify a location:

webpack.config.js

module.exports = {
  //...
  recordsPath: path.join(__dirname, 'records.json')
};

Records are particularly useful if you have a complex setup that leverages Code Splitting. The data can be used to ensure the split bundles are achieving the caching behavior you need.

Note that although this file is generated by the compiler, you may still want to track it in source control to keep a history of how it has changed over time.

Setting recordsPath will essentially set recordsInputPath and recordsOutputPath to the same location. This is usually all that's necessary unless you decide to change the name of the file containing the records. See below for an example.

recordsInputPath

string

Specify the file from which to read the last set of records. This can be used to rename a records file. See the example below.

recordsOutputPath

string

Specify where the records should be written. The following example shows how you might use this option in combination with recordsInputPath to rename a records file:

webpack.config.js

module.exports = {
  //...
  recordsInputPath: path.join(__dirname, 'records.json'),
  recordsOutputPath: path.join(__dirname, 'newRecords.json')
};

name

string

Name of the configuration. Used when loading multiple configurations.

webpack.config.js

module.exports = {
  //...
  name: 'admin-app'
};

infrastructureLogging

Options for infrastructure level logging.

object = {}

infrastructureLogging.level

string

Enable infrastructure logging output. Similar to stats.logging option but for infrastructure. No default value is given.

Possible values:

• 'none' - disable logging
• 'error' - errors only
• 'warn' - errors and warnings only
• 'info' - errors, warnings, and info messages
• 'log' - errors, warnings, info messages, log messages, groups, clears. Collapsed groups are displayed in a collapsed state.
• 'verbose' - log everything except debug and trace. Collapsed groups are displayed in expanded state.

webpack.config.js

module.exports = {
  //...
  infrastructureLogging: {
    level: 'info'
  }
};

infrastructureLogging.debug

string RegExp function(name) => boolean [string, RegExp, function(name) => boolean]

Enable debug information of specified loggers such as plugins or loaders. Similar to stats.loggingDebug option but for infrastructure. No default value is given.

webpack.config.js

module.exports = {
  //...
  infrastructureLogging: {
    level: 'info',
    debug: [
      'MyPlugin',
      /MyPlugin/,
      (name) => name.contains('MyPlugin')
    ]
  }
};