Have you read the Contributing Guidelines on issues?

• I have read the Contributing Guidelines on issues.

WebdriverIO Version

latest

Node.js Version

latest

Mode

WDIO Testrunner

Which capabilities are you using?

No response

What happened?

When using getSize() in TypeScript I get a compile error:
Expected 1 arguments, but got 0.

What is your expected behavior?

getSize() argument is optional.

How to reproduce the bug.

https://github.com/therealbrad/wdio-getsize shows the bug
Note the test passes, but TypeScript complains:

Property 'height' does not exist on type 'number'.
Property 'width' does not exist on type 'number'.```

### Relevant log output

```typescript
Expected 1 arguments, but got 0.
Property 'height' does not exist on type 'number'.
Property 'width' does not exist on type 'number'.

Code of Conduct

• I agree to follow this project's Code of Conduct

Is there an existing issue for this?

• I have searched the existing issues