I'm trying to mock a TypeScript class with Jest and I'm obviously doing something because receive the following error:
error TS2743: No overload expects 1 type arguments, but overloads do exist that expect either 0 or 2 type arguments.
This is my code:
Foo.ts
export default class Foo {
bar(): number {
return Math.random()
}
}
Foo.test.ts
import Foo from './Foo'
describe('Foo', () => {
it("should pass", () => {
const MockFoo = jest.fn(() => ({
bar: jest.fn(() => {
return 123
}),
}))
})
})
The full error:
TypeScript diagnostics (customize using `[jest-config].globals.ts-jest.diagnostics` option):
src/Foo.test.ts:6:29 - error TS2743: No overload expects 1 type arguments, but overloads do exist that expect either 0 or 2 type arguments.
6 const MockFoo = jest.fn(() => ({
~~~
UPDATE
If it is of any relevance, this is my Jest config:
module.exports = {
moduleFileExtensions: ['ts', 'js'],
transform: {
'^.+\\.ts$': 'ts-jest',
},
testMatch: ['**/src/**/*.test.(ts)'],
testEnvironment: 'node',
};
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