When a variable is declared in Visual Studio Code, it still displays red squiggly lines

I keep seeing red squiggly lines in Visual Studio Code, even when the variable is defined and I get an error message.

Disabling ESLint seems to make the problem disappear, but I feel like that's not the best solution as it would disable linting for the entire TypeScript/JavaScript files. (I have the ESLint extension installed)

I am running Visual Studio Code version 1.57.1 (Universal) on Mac OS Catalina.

If I right-click, I can go to the browser definition.

https://i.sstatic.net/ow61t.png

beforeAll(async () => {
await browser.url('https://example.com/');

}

When I check the definition, it appears as shown below https://i.sstatic.net/06fjw.png

https://i.sstatic.net/AfU07.png

The piece of code causing these issues is in a .js file located at the bottom right corner of Visual Studio Code.

https://i.sstatic.net/I1iVC.png

How do I resolve this problem without disabling ESLint? I already attempted removing the .vs folder as suggested in one of the solutions mentioned here, but it didn't work: Visual Studio compiles fine, but it still shows red lines

I've also included these libraries in my code:

npm i
npm install @wdio/cli (https://webdriver.io/docs/gettingstarted/)
npx wdio config

I'm able to compile my project, but how can I eliminate those red lines without turning off ESLint?

Thank you for your assistance!

beforeAll(async () => {
    await browser.url('https://example.com/');
})
<script src="https://cdnjs.cloudflare.com/ajax/libs/jquery/1.2.3/jquery.min.js">
</script>

Note: I'm unsure about creating a minimal viable product from this code. However, beforeAll is defined from a node module. Relevant files are provided below. node_modules/@types/jest/index.d.ts

declare var beforeAll: jest.Lifecycle;

This is how my package.json file is structured:

{
  "name": "test-app",
  "version": "0.1.0",
  "private": true,
  ...
}

This setup involves using Jest and Web Driver for UI automation in browsers.

The file node_modules/jest-playwright-preset/types/global.d.ts contains the code shown in the screenshots above.

import {
...
...
...
}

Answer №1

When it comes to global variables, Eslint may not always be aware of them. In order to address this issue, there are two possible solutions:

  • Inform Eslint about the defined variables
  • Turn off the Eslint rule that detects undefined variables

To specify the global variables to Eslint, you can add them to your Eslint configuration file like so:

{
    "globals": {
        "var1": true,
    }
}

For more information, check out the documentation at: https://eslint.org/docs/2.13.1/user-guide/configuring#specifying-globals

Eslint also offers 'environments' which encompass all global variables for specific frameworks. Learn more about using environments here: https://eslint.org/docs/2.13.1/user-guide/configuring#specifying-environments

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