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How to Implement Dependency Injection in JavaScript (No Frameworks)

How I learned to build flexible JavaScript applications without Angular, React, or any DI framework — just pure, elegant dependency injection patterns.

Three months ago, I inherited a JavaScript codebase that looked like someone had detonated a spaghetti bomb in a file system. Every module directly imported every other module it needed. Testing required mocking half the internet. Making a simple change meant touching 15 files because everything was coupled tighter than a Victorian corset.

https://medium.com/codetodeploy/how-to-implement-dependency-injection-in-javascript-no-frameworks-07bcc7ffd3fd?sk=080b0584f890d7f5c3e945f0598088cc

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