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Additional methods for different mocking libraries to introduce "late resolve" of promises returned by the mock functions. This allows tests that read chronologically, like a story.

Home Page: https://medium.com/houston-io/how-to-unit-test-asynchronous-code-for-javascript-in-2020-41c124be2552

JavaScript 99.35% Shell 0.65%
javascript jest sinon async async-await unit-testing tdd bdd

async-fn's Issues

TypeScript Definitions

Currently, there are no TypeScript definition files in the package. Is possible to export them?
My global definition for the '@async-fn/jest' package is below:

/// <reference types="jest" />

type AsyncFunction = (...args: any[]) => Promise<unknown>;

type PromiseValue<PromiseType, Otherwise = PromiseType> = PromiseType extends Promise<infer Value>
	? { 0: PromiseValue<Value>; 1: Value }[PromiseType extends Promise<unknown> ? 0 : 1]
	: Otherwise;

type AsyncReturnType<Target extends AsyncFunction> = PromiseValue<ReturnType<Target>>;

declare module '@async-fn/jest' {
  type MockedAsyncFn<T extends (...args: any[]) => any> =
    & Omit<
      jest.MockInstance<ReturnType<T>, Parameters<T>>,
      | 'mockImplementation'
      | 'mockImplementationOnce'
      | 'mockReturnValue'
      | 'mockReturnValueOnce'
    >
    & T & {
      resolve: (resolvedValue: AsyncReturnType<T>) => Promise<void>,
      reject: (rejectValue: any) => Promise<void>
    };
  export type { MockedAsyncFn };

  export default function asyncFn<T, Y extends any[]>(implementation?: (...args: Y) => T): jest.Mock<T, Y>;
  export default function asyncFn(): jest.Mock;
}

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