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.
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