refactor(core): add generic utilities for resolving value-or-function patterns, replace specialized resolveStaleTime and resolveEnabled
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braden-w
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resolveStaleTime and resolveEnabled
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… patterns, replace specialized `resolveStaleTime` and `resolveEnabled` This commit introduces `isFunctionVariant()` and `resolveValueOrFunction()` utilities to replace repetitive `typeof === 'function'` checks throughout the codebase, consolidating the common "value or function that computes value" pattern.
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… NonFunctionGuard This simplification is possible due to the introduction of generic runtime utilities that handle value-or-function resolution. The new `resolveValueOrFunction()` utility handles the distinction between direct values and functions at runtime with proper type safety, eliminating the need for complex type-level guards.
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This PR introduces
isFunctionVariant()andresolveValueOrFunction()utilities to replace repetitivetypeof === 'function'checks throughout the codebase, consolidating the common "value or function that computes value" pattern.Problem and Solution
The codebase had scattered implementations of the same pattern across multiple files:
This led to code duplication, inconsistency, and maintenance overhead. We also had specialized versions like
resolveStaleTime()andresolveEnabled()that could be generalized.The new utilities provide a clean, generic solution:
While we could inline
typeof value === 'function'checks, TypeScript's type narrowing doesn't work properly with generic types in complex expressions. TheisFunctionVariant()type guard provides proper type narrowing that allowsresolveValueOrFunction()to safely call the function variant. Without it, TypeScript throws errors because it can't guarantee the type safety across the generic boundary.Both utilities support zero-argument functions (
() => T) and functions with parameters ((...args) => T), making them applicable to all value-or-function patterns in the codebase.Updated implementations in
query.ts,queryObserver.ts, andretryer.tsfor handlinginitialData,retryDelay,refetchInterval, andnotifyOnChangeProps. These utilities can replace existingresolveStaleTime()andresolveEnabled()functions in future iterations.