New JavaScript Package Enables Testing Retry Logic Without Refactoring

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A new tool called @typescript-guy/fn-monitor allows developers to test JavaScript/TypeScript retry logic without refactoring production code. The package monitors and controls function execution at the AST level using a JS-in-JS interpreter. It specifically enables mocking internal variables like retry delays and attempt limits during testing. This approach eliminates the need for dependency injection or fake timer setups. The tool is available as an open-source npm package with accompanying documentation.

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