Implement a ReturnTypeOf<T> Conditional Type in TypeScript

Marius Schulz
InstructorMarius Schulz

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In this lesson, we're going to write another conditional type. This time, we'll implement a ReturnTypeOf<T> helper type which lets us extract the return type of a function type. This type is identical to the ReturnType<T> helper type that's defined in the core type declaration files that ship with the TypeScript compiler.