What does the following function overload pattern enable? function process(input: string): string; function process(input: number): number; function process(input: string | number): string | number { return input; }

Question

TypeScript Professional — Hard

What does the following function overload pattern enable? function process(input: string): string; function process(input: number): number; function process(input: string | number): string | number { return input; }

Accepted Answer

This function overload pattern in TypeScript enables creating type-safe call signatures, ensuring that callers receive the correct return type based on the input type (string or number). The implementation can handle both scenarios seamlessly.