Invalidator

Invalidator is a tiny (seriously it's like 10 lines) utility that allows you to define dependencies globally, even accross tabs. This is for example useful for when you want to invalidate stuff that depends on the browser cache.

Usage

First install it:

npm i invalidator

Then use it:

import { invalidate, depends } from 'invalidator';

// Define a dependency
depends('my-key', () => {
  console.log('This will be called when you invalidate the dependency');
});

// Invalidate the dependency
invalidate('my-key');

//The console will have logged

This invalidation even works across tabs, so if you have multiple tabs open and you invalidate a key, that key will be invalidated in all tabs.

It internally uses BroadcastChanel to do this. If you want the cross-tab functionality to work in browser that don't support BroadcastChanel (like IE), you must use a polyfill. (Single tab functionality will still work)