.mock doesn't exist

[moonformeli]

💬 Questions and Help

Hi, I'm new to Jest. I was following the code from es6-class-mocks.
And there's something that doesn't work in my code.

// package.json
"devDependencies": {
  "@types/jest": "^24.0.18",
  "jest": "^24.9.0",
  "ts-jest": "^24.1.0",
  "typescript": "^3.6.3"
},

// jest.config.js
module.exports = {
  roots: ["<rootDir>/src"],
  transform: {
    "^.+\\.tsx?$": "ts-jest"
  }
};

I'm using jest with TypeScript. And these below are the related codes about my question.

// Sport.ts
export default class Sport {
  name: string;

  constructor() {
    this.name = "Sport";
  }

  printName() {
    return this.name;
  }
}

// Sport.spec.ts
import Sport from '../Sport';
jest.mock('../Sport');

beforeEach(() => {
  // This gives me an error
  Sport.mockClear();
});

So, Sport.mockClear() gives me an error, Property 'mockClear' does not exist on type 'typeof Sport'.ts. And Sport doesn't even have mock property.

So I found this issue ts-jest issue, and here's my new code.

// Sport.spec.ts
import Sport from '../Sport';
import { mocked } from 'ts-jest/utils';
jest.mock('../Sport');

beforeEach(() => {
  // This works
  mocked(Sport).mockClear();
});

it('Constructor is called', () => {
  new Sport();
  expect(Sport).toHaveBeenCalledTimes(1);
});

it('Mock is clear', () => {
  // Succeess
  expect(Sport).not.toHaveBeenCalled();
});

Question

So, I wonder why Sport.mockClear is error and is it the only way to use ts-jest/utils?

[thymikee]

This is a TypeScript error. One thing you could do is to cast the type to jest.Mock. Please ask on TS forums about it though.

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