bug: Console error Cannot read properties of null (reading 'getTypeChecker')

[James-Wilkinson-git]

Prerequisites

• [X] I have read the Contributing Guidelines.
• [X] I agree to follow the Code of Conduct.
• [X] I have searched for existing issues that already report this problem, without success.

Stencil ESLint Version

^0.7.1

Current Behavior

After installing eslint and the plugin for stencil lint then running on the files the console errors

Oops! Something went wrong! :(

ESLint: 8.56.0

TypeError: Error while loading rule '@stencil-community/async-methods': Cannot read properties of null (reading 'getTypeChecker')

Expected Behavior

The linter should run

Steps to Reproduce

Install a new eslint and eslint stencil into your project

Code Reproduction URL

n/a

Additional Information

No response

[certainlyakey]

Same with older versions (tested at 0.6.0). Eslint 8.51.0, node 18.17.1.

[Lunarion]

We are facing the same problem. Are there any updates or workarounds?

[gavmck]

Also running into this one with eslint 8.56.0.

Edit: Adding some more detail. It looks like this error kicks in on eslint 8.45.0

Edit again: Stencil is expecting typed rules to be on https://typescript-eslint.io/developers/custom-rules/#typed-rules

The error comes from services.program.getTypeChecker, but program is null if type checking is turned off.

I had a look around and it seemed that eslint was not picking up my tsconfig so type checking was turned off, breaking stencil.

I had a peek at these release notes https://typescript-eslint.io/blog/announcing-typescript-eslint-v6/

Then added

"parserOptions": {
    "project": "./tsconfig.json"
  }

to my .eslintrc.json, which seems to have fixed the issue. :rocket:

Hope that helps someone!

[ogdakke]

Had the same issue, and resolved it in our monorepo by adding

"parser": "@typescript-eslint/parser",
    "parserOptions": {
        "project": "./tsconfig.json"
    },

We're doing the "one tsconfig per package" method in our monorepo. See typescript-eslint monorepo configuration