Removes a module and all of its dependents from the require cache
Switch branches/tags
Nothing to show
Clone or download
Fetching latest commit…
Cannot retrieve the latest commit at this time.
Failed to load latest commit information.


Build Status npm

Removes a module and all of its dependents from the require cache, so that subsequent requires of that module or any of its dependents will return new copies.

Useful for implementing a hot-reloading environment for Node.js programs in watch mode.

e.g. iterating on a static site generator that uses server side rendered React components for templating.


npm install invalidate-module


Start the module dependencies tracking by requiring invalidate-module.

const invalidate = require('invalidate-module');

Call invalidate() with the absolute path of a module to remove it and its dependents from require.cache.


Note that you must provide the absolute path of the module, so use something like require.resolve() or path.resolve().

Now the next time you call require('./my-module'), it will return a new copy of ./my-module instead of a cached copy.


Example when used with a watcher like chokidar:

// watch.js
const chokidar = require('chokidar');
const invalidate = require('invalidate-module');
const path = require('path');

const watcher ='*.js', { ignoreInitial: true });


watcher.on('all', (event, filename) => {
// a.js
console.log('this is module a');
// b.js
console.log('this is module b');

Running watch.js will call require('./a') which prints:

this is module b
this is module a

If you make this change to a.js and save:

// a.js
console.log('this is module a, version 2');

The watcher callback will fire and invalidate a.js so that require('./a') loads the new version and this gets logged:

this is module a version 2

Because b.js is still in require.cache, the require('./b') does nothing.

If you make this change to b.js and save:

// b.js
console.log('this is module b version 2');

b.js and its dependent a.js will be invalidated and re-running require('./a') in the watch callback will log:

this is module b v2
this is module a v2


At the time of requiring this module, node's require() is monkey-patched so that subsequent calls will add the caller module and the required module to a graph. When you call invalidate() on a module, it deletes the module from require.cache and then it uses the graph to get the module's dependents and deletes them from require.cache as well.


Running with env vars DEBUG=invalidate-module will log the modules that are deleted from require.cache.

Further Reading