docs: Update typescript code blocks in docs

[cpAdm]

- Some typescript codeblocks were defined as js instead of ts

• Could not update API docs: 5ba5ac2
  Since only JS blocks are added to docs, not TS code blocks. Should probably be allowed?
• Updated all TS blocks to JS
• Some other small updates:
  • Fixed wrong param for --update-snapshots
  • Replaced deprecated string.substr
  • Removed unused parameters in examples
• Fix: [BUG]: Numbered list gets flattened out playwright.dev#1714

[dgozman]

Thank you for the PR. We intentionally use js code blocks instead of ts, because that produces better highlight on our documentation site.

[cpAdm]

Thank you for the PR. We intentionally use js code blocks instead of ts, because that produces better highlight on our documentation site.

Seems a bit weird to me that ts produces worse highlighting than js for typescript code?

Example, type is not highlighted here with js
https://playwright.dev/docs/accessibility-testing#creating-a-fixture

With ts

With js

[dgozman]

Seems a bit weird to me that ts produces worse highlighting than js for typescript code?

I understand that, but the decision was made after looking quite a few snippets. I don't think we really want to change that for now.

[cpAdm]

@dgozman Confusingly, there are already 36 code blocks with ts in the docs. That's why I thought it was fine using them. But if you want I can revert my ts changes, and just keep the 'Some other small updates' changes?

[dgozman]

@dgozman Confusingly, there are already 36 code blocks with ts in the docs. That's why I thought it was fine using them. But if you want I can revert my ts changes, and just keep the 'Some other small updates' changes?

Yeah, that would be great. In fact, if you'd like to change those 36 ts blocks into js, that would be nice as well. Thank you!