Having trouble compiling my project with Typescript, Jest, @types/jest, and ts-jest

I'm currently utilizing jest for mocking my axios requests. Here is an example of my test implementation:

// External imports
import axios, { AxiosPromise } from 'axios'

// Personal imports
import { getProgramApplications } from '#stores'
import { programItem } from '../fixtures/zanox'

describe('Zanox sales', async function () {
    describe('Get program applications', async function () {
        it('should retrieve program applications', async function () {
            const program = programItem()
            const mock = jest.spyOn(axios, 'get')
            mock.mockReturnValueOnce({ data: [program] } as unknown as AxiosPromise<unknown>)
            getProgramApplications(process.env.ZANOX_ADSPACE!)
        })
    })
})

This section pertains to my package.json:

{
    "name": "zanox",
    "version": "1.0.0",
    "main": "index.js",
    "license": "MIT",
    // More configurations go here...
}

Lastly, we have the tsconfig.json file:

{
    "compilerOptions": {
        "baseUrl": ".",
        // Additional options are listed here...
}

The issue I am encountering involves compilation errors when attempting to build my project. The terminal output displays errors related to variable declarations within the type definitions of Mocha and Jest. I have thoroughly reviewed discussions recommending upgrades to the typescript version and removal of jasmine, even though my project does not utilize jasmine and is already using the latest typescript version. Why am I experiencing this problem?

Answer №2

One possible explanation is the presence of types/jest and types/mocha in your devDependencies list. By removing mocha, you may be able to resolve issues such as 'also declared here'.

To uninstall types/mocha from devDependecies, run the command: npm uninstall --save-dev @types/mocha

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