chore(wdio-types): remove implicit dependency on ts-node

[boneskull]

Before this, @wdio/types needs ts-node installed to be used (which is not present in its dependencies, devDependencies or otherwise). This is pretty annoying if you don't use ts-node otherwise.

I have copied the relevant types from ts-node and put them into src/Compiler.ts.

I have added typescript as a peerDependency, because @wdio/types now depends on types in the typescript package itself. Given that typescript is probably installed anyway by consumers, it did not seem appropriate to add it to dependencies. I can understand if we just want to drop this from peerDependencies altogether, but it does mean that there's still an implicit dependency, which doesn't really solve the problem.

Proposed changes

Types of changes

• Bugfix (non-breaking change which fixes an issue)
• New feature (non-breaking change which adds functionality)
• Breaking change (fix or feature that would cause existing functionality to not work as expected)
• Documentation update

Checklist

• I have read the CONTRIBUTING doc
• I have added tests that prove my fix is effective or that my feature works
• I have added necessary documentation (if appropriate)
• I have added proper type definitions for new commands (if appropriate)

Further comments

Reviewers: @webdriverio/project-committers

[boneskull]

cc @christian-bromann

[boneskull]

Another way to approach this would be to move the types which needed ts-node originally into a separate package or otherwise split these up. As a consumer of @wdio/types, I don't actually need any of the types that rely on it.

[christian-bromann]

Thanks 👍

Even though we might run into issues when these types change upstream I think this is the best solution for now to move forward.