inject-loader

A Webpack loader for injecting mock dependencies into modules under test. Current stable version 4.0.1, maintained steadily. It wraps all require statements in a module so you can substitute them during testing. Unlike proxyquire or rewire, it works as a Webpack inline loader, making it seamless in Webpack-based projects. Supports Webpack 1 through 4. Particularly useful for unit testing where you need to mock internal dependencies of a module before it executes.