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README.md
enhanced-resolve
Offers an async require.resolve function. It's highly configurable.
Features
- plugin system
- provide a custom filesystem
- sync and async node.js filesystems included
Getting Started
Install
# npm
npm install enhanced-resolve
# or Yarn
yarn add enhanced-resolve
Creating a Resolver
The easiest way to create a resolver is to use the createResolver function on ResolveFactory, along with one of the supplied File System implementations.
const {
NodeJsInputFileSystem,
CachedInputFileSystem,
ResolverFactory
} = require('enhanced-resolve');
// create a resolver
const myResolver = ResolverFactory.createResolver({
// Typical usage will consume the `NodeJsInputFileSystem` + `CachedInputFileSystem`, which wraps the Node.js `fs` wrapper to add resilience + caching.
fileSystem: new CachedInputFileSystem(new NodeJsInputFileSystem(), 4000),
extensions: ['.js', '.json']
/* any other resolver options here. Options/defaults can be seen below */
});
// resolve a file with the new resolver
const context = {};
const lookupStartPath = '/Users/webpack/some/root/dir';
const request = './path/to-look-up.js';
myResolver.resolve({}, lookupStartPath, request, (err/*Error*/, filepath/*string*/) => {
// Do something with the path
});
For more examples creating different types resolvers (sync/async, context, etc) see lib/node.js.
Resolver Options
| Field | Default | Description |
|---|---|---|
| modules | ["node_modules"] | A list of directories to resolve modules from, can be absolute path or folder name |
| descriptionFiles | ["package.json"] | A list of description files to read from |
| plugins | [] | A list of additional resolve plugins which should be applied |
| mainFields | ["main"] | A list of main fields in description files |
| aliasFields | [] | A list of alias fields in description files |
| mainFiles | ["index"] | A list of main files in directories |
| extensions | [".js", ".json", ".node"] | A list of extensions which should be tried for files |
| enforceExtension | false | Enforce that a extension from extensions must be used |
| moduleExtensions | [] | A list of module extensions which should be tried for modules |
| enforceModuleExtension | false | Enforce that a extension from moduleExtensions must be used |
| alias | [] | A list of module alias configurations or an object which maps key to value |
| resolveToContext | false | Resolve to a context instead of a file |
| unsafeCache | false | Use this cache object to unsafely cache the successful requests |
| cacheWithContext | true | If unsafe cache is enabled, includes request.context in the cache key |
| cachePredicate | function() { return true }; | A function which decides whether a request should be cached or not. An object is passed to the function with path and request properties. |
| fileSystem | The file system which should be used | |
| resolver | undefined | A prepared Resolver to which the plugins are attached |
Plugins
Similar to webpack, the core of enhanced-resolve functionality is implemented as individual plugins that are executed using Tapable. These plugins can extend the functionality of the library, adding other ways for files/contexts to be resolved.
A plugin should be a class (or its ES5 equivalent) with an apply method. The apply method will receive a resolver instance, that can be used to hook in to the event system.
Plugin Boilerplate
class MyResolverPlugin {
constructor(source, target) {
this.source = source;
this.target = target;
}
apply(resolver) {
resolver.plugin(this.source, (request, callback) => {
// Any logic you need to create a new `request` can go here
resolver.doResolve(this.target, request, null, callback);
});
}
}
Plugins are executed in a pipeline, and register which event they should be executed before/after. In the example above, source is the name of the event that starts the pipeline, and target is what event this plugin should fire, which is what continues the execution of the pipeline. For an example of how these different plugin events create a chain, see lib/ResolverFactory.js, in the //// pipeline //// section.
Tests
npm test
Passing options from webpack
If you are using webpack, and you want to pass custom options to enhanced-resolve, the options are passed from the resolve key of your webpack configuration e.g.:
resolve: {
extensions: ['', '.js', '.jsx'],
modules: ['src', 'node_modules'],
plugins: [new DirectoryNamedWebpackPlugin()]
...
},
License
Copyright (c) 2012-2016 Tobias Koppers