ESLint warning: Potentially risky assignment of an undetermined data type and hazardous invocation of an undetermined data type value

Review this test code:

import { isHtmlLinkDescriptor } from '@remix-run/react/links'
import invariant from 'tiny-invariant'
import { links } from '~/root'

it('should return a rel=stylesheet', () => {
  const response = links()

  invariant(isHtmlLinkDescriptor(response[0]))

  expect(response[0].rel).toBe('stylesheet')
})

and its corresponding implementation:

import { LinksFunction } from 'remix'
import tailwindProdUrl from '~/styles/tailwind.css'

export const links: LinksFunction = () => {
  const href =
    process.env.NODE_ENV !== 'production' ? './tailwind.css' : tailwindProdUrl

  return [{ rel: 'stylesheet', href }]
}

Where LinksFunction can be found here and here.

What's the reason behind ESLint flagging "Unsafe assignment of an any value." and "Unsafe call of an any typed value." in this line below?

const response = links()

Answer №1

The second code snippet contains an incorrect import statement. It should be:

import { LinksFunction } from '@remix-run/server-runtime';

Alternatively, if you are using TypeScript version 3.8 or later:

import type { LinksFunction } from '@remix-run/server-runtime';

In the code you provided, LinksFunction is only used as a type. This means that even without the correct type definitions, the TypeScript compiler may still successfully compile your modules in certain cases.

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