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inject-loader

A Webpack loader for injecting code into modules via their dependencies

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*** ### Why This is particularly useful for writing tests where mocking things inside your module-under-test is sometimes necessary before execution. `inject-loader` was inspired by, and builds upon ideas introduced in [jauco/webpack-injectable](https://github.com/jauco/webpack-injectable). ### Usage [Documentation: Using loaders](http://webpack.github.io/docs/using-loaders.html) Use the inject loader by adding the `inject-loader!` [inline loader](https://webpack.js.org/concepts/loaders/#inline) when you use `require`, this will return a function that can used in test code to modify the injected module. By default all `require` statements in an injected module will be altered to be replaced with an injector, though if a replacement it not specified the default values will be used. ### Examples Given some code in a module like this: ```javascript // MyStore.js var Dispatcher = require('lib/dispatcher'); var EventEmitter = require('events').EventEmitter; var handleAction = require('lib/handle_action'); Dispatcher.register(handleAction, 'MyStore'); ``` You can manipulate itโ€™s dependencies when you come to write tests as follows: ```javascript // If no flags are provided when using the loader then // all require statements will be wrapped in an injector MyModuleInjector = require('inject-loader!MyStore') MyModule = MyModuleInjector({ 'lib/dispatcher': DispatcherMock, 'events': EventsMock, 'lib/handle_action': HandleActionMock }) ``` There are a few examples of complete test setups for both Webpack 1, 2, 3 & 4 in the [`example`](./example) folder. ## License MIT (http://www.opensource.org/licenses/mit-license.php)