A javascript library or framework that replicates the ‘require’ functionality that node.js provides [closed]

So i've noticed that virtually all javascript libraries out there now are made to work for node.js which make them hard to integrate into good old plain client-side javascript projects(i.e a non node.js environment)….

To this end, i was thinking if there is a javascript library or framework that replicates the require functionality that node.js provides, which will let you…well basically require a libraries modules or code, which can then be used in a normal vanilla javascript environment but during production and otherwise.

Thanks people ✌