require-poisoning

Cache poisoning applied to the Node.js require statement. All modules are cached internally in the require.cache object to prevent multiple sync read operations when modules are required multiple times. We can poison that cache object to introduce mocks by overriding or introducing new values in the cache. And that is exactly what this library is, a helper to poison the cache.

installation

The package is released in the public npm registry and can be installed using:

npm install --save require-poisoning

Usage

A single function is returned when you require the module which accepts the following arguments:

• name Name of the module that needs to be overridden
• value Data it needs to override with.

For example, if you wish to override the react-native module, you would do the following:

const poison = require('require-poisoning');

poison('react-native', {
  AsyncStorage: require('asyncstorageapi')
});

And you've now mocked the react-native module and introduced the AsyncStorage export as asyncstorageapi module.

License

MIT