Error in TypeScript: Angular Jasmine - The argument given as type 'string' cannot be assigned to a parameter expecting type 'never'

Currently, I am in the process of writing test cases for Angular using Jasmine 3.6.0 and TypeScript 4.1.5 with "strict": false set in my tsconfig.json file.

One particular task involves spying on a component method called 'close', and following the correct syntax, I wrote the code snippet below:

let spy = spyOn<MyComponent>(component,'close');

Initially, everything was functioning as expected. However, upon moving the source code to a different directory, installing node modules, I encountered the following error:

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

I have come across similar issues posted by other developers and attempted their suggested solutions, yet I continue to face the same error. Despite having disabled strict mode, I remain puzzled as to what exactly is causing this problem.

angulartypescriptjasmine

Answer №1

const spy = spyOn<MyComponent, any>(component,'close')

Answer №2

The issue has been successfully resolved

const spy = jest.spyOn<MyComponent>(component, 'close' as never)

At the moment, everything seems to be functioning without any errors, although I am unsure if this implementation is accurate.

Answer №3

Just had an encounter with this issue, turns out the problem stems from the method I'm attempting to spyOn() having private access.

To resolve this error and successfully conduct unit testing, make sure to update the method's accessibility to public.

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