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TypeScript - get function return type

5 points
Created by:
a_horse
388

In this short article we would like to show how to get type of object returned by function in TypeScript.

Quick solution:

const MyFunction = (): string => { return ''; }
type MyType = ReturnType<typeof MyFunction>; // string

Practical example:

type Action1 = () => void;
type Action2 = () => string;

const Function1 = (): void => {
    console.log('void return');
};
const Function2 = (text: string): string => {
    return `Text: ${text}`;
};

type Action1Result = ReturnType<Action1>;             // void
type Action2Result = ReturnType<Action2>;             // string

type Function1Result = ReturnType<typeof Function1>;  // void
type Function2Result = ReturnType<typeof Function2>;  // string

type Function1Result = ReturnType<() => void>;        // void
type Function2Result = ReturnType<() => string>;      // string

Alternative titles

  1. TypeScript - get function result type
  2. TypeScript - obtain function return type
  3. TypeScript - extract function return type
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