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Short summary

TypeScript's const type parameters solve type widening in generic functions by inferring the narrowest possible type at the function signature level, eliminating the need for caller-side as const assertions. The modifier preserves literal types, readonly tuples, and deeply readonly object properties automatically. It excels in configuration builders, API route definitions, and discriminated union factories where literal types drive control flow.

• •const type parameters infer narrowest types without caller-side as const
• •Preserves string literals, readonly tuples, and readonly object properties
• •Best used in config builders, API routes, and discriminated union factories

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