Generic Constraints with extends
T extends U restricts valid type arguments to subtypes of U and lets the body use U's members on T. The constraint also serves as the inference fallback and enables patterns like <K extends keyof T> for type-safe property access.
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T extends U restricts valid type arguments to subtypes of U and lets the body use U's members on T. The constraint also serves as the inference fallback and enables patterns like <K extends keyof T> for type-safe property access.
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