Argument of type X is not assignable to parameter of type 'never'

[ypicard]

🐛 Bug Report

I am trying to use ts-jest to mock one of my dependencies. This dependency (auth0.ManageClient) has multiple definitions for a same method and overrides it based on the params you pass it:

    // Roles
    getRoles(): Promise<Role[]>;
    getRoles(cb: (err: Error, roles: Role[]) => void): void;
    getRoles(params: GetRolesData): Promise<Role[]>;
    getRoles(params: GetRolesData, cb: (err: Error, roles: Role[]) => void): void;
    getRoles(params: GetRolesDataPaged): Promise<RolePage>;
    getRoles(params: GetRolesDataPaged, cb: (err: Error, rolePage: RolePage) => void): void;

When trying to mock the getRoles method, I get the following message: Argument of type X is not assignable to parameter of type 'never'.

I think this is because ts-jest is expecting me to override the getRoles(cb: (err: Error, roles: Role[]) => void): void; which is not what I am trying to do. I want to mock its result with .mockResolvedValue.

To Reproduce

import { ManagementClient } from 'auth0';
import { MockedObjectDeep } from 'ts-jest/dist/utils/testing';
import { mocked } from 'ts-jest/utils';

jest.mock('auth0');

describe('UsersService', () => {
    let manageClient: MockedObjectDeep<ManagementClient>;

    beforeEach(() => {
        jest.clearAllMocks();

        manageClient = mocked(
            new ManagementClient({
                domain: 'DOMAIN',
                clientId: 'CLIENT_ID',
                clientSecret: 'CLIENT_SECRET',
            }),
            true
        );
    });

    describe('updateUserRoles', () => {
        beforeEach(() => {
            manageClient.getRoles.mockResolvedValue([]); // error will show here
        });

        it('should test something', async () => {
            //    ...
        });
    });
});

Expected behavior

Typings should support method overriding.

[spridev]

The same problem is occuring when using @aws-sdk modules:

import { Readable } from 'stream'
import { mocked } from 'ts-jest/utils'
import { S3 } from '@aws-sdk/client-s3'

jest.mock('@aws-sdk/client-s3')

const S3Mock = mocked(S3, true)

test('get-object', async function () {
  const data = Readable.from('data')

  // TS2322: Type 'Readable' is not assignable to type 'never'.
  S3Mock.prototype.getObject.mockResolvedValue({ Body: data })
})

I'm using the following code as a temporary fix:

S3Mock.prototype.getObject.mockImplementation(() => ({ Body: data }))

Hope it helps.

[ahnpnl]

PR is welcome if you guys know the fix :)

[ahnpnl]

close as won't fix since mocked now is included in jest-mock, see jestjs/jest#12089