Install and configure ts-jest

[swissspidy]

Context

So that we can write tests in TypeScripts if desired.

See #12097

Summary

Relevant Technical Choices

• Set isolatedModules: true in the ts-jest config to essentially disable type checking in tests.
  Without this I wasn't able to get it to work properly. ts-jest somehow didn't pick up the TS config correctly and couldn't find the type definition for WEB_STORIES_ENV for example, while that works just fine with tsc --build. See https://github.com/kulshekhar/ts-jest/issues/1648

To-do

• Set isolatedModules: false in the future.

User-facing changes

None

Testing Instructions

• [x] This is a non-user-facing change and requires no QA

This PR can be tested by following these steps:

Reviews

Does this PR have a security-related impact?

No

Does this PR change what data or activity we track or use?

No

Does this PR have a legal-related impact?

No

Checklist

• [x] This PR addresses an existing issue and I have linked this PR to it in ZenHub
• [x] I have tested this code to the best of my abilities
• [x] I have verified accessibility to the best of my abilities (docs)
• [x] I have verified i18n and l10n (translation, right-to-left layout) to the best of my abilities
• [x] This code is covered by automated tests (unit, integration, and/or e2e) to verify it works as intended (docs)
• [x] I have added documentation where necessary
• [x] I have added a matching Type: XYZ label to the PR

---

Fixes #12097

[googleforcreators-bot]

Plugin builds for 30dc7a2b33cf6a6456af89baa7068de689c8f8d9 are ready :bellhop_bell:!

• Download development build
• Download production build

[timarney]

Looks like this is falling out of date.

[swissspidy]

I know, it‘s why it‘s still a draft

[swissspidy]

@barklund Looks like I broke rich-text tests here. Could you perhaps take a look? 😅 Not seeing the forest for the trees right now.

[github-actions[bot]]

Size Change: +96 B (0%)

Total Size: 2.72 MB

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