[trusted-types] Properly augment global to prevent conflicts with lib…

[eps1lon]

Retrying #62209 which was already ready to merge. Accidentally forgot to land. Will just wait for CI and then merge.

This is the proper patern to augment global interfaces that are defined by the runtime (see #60837 (review))

The previous approach would break once lib.dom.d.ts declares these interfaces.

The previous approach also made it impossible for other libraries to use these types.
For example, #60691 had to be reverted.
With proper module augmentation we can land #60691 again.

Verified that the new approach will allow landing #60691: #61166

Please fill in this template.

• Use a meaningful title for the pull request. Include the name of the package modified.
• Test the change in your own code. (Compile and run.)
• Add or edit tests to reflect the change.
• Follow the advice from the readme.
• Avoid common mistakes.
• Run npm test <package to test>.

Select one of these and delete the others:

If changing an existing definition:

• Provide a URL to documentation or source code which provides context for the suggested changes:
  • https://developer.mozilla.org/en-US/docs/Web/API/TrustedHTML
  • https://developer.mozilla.org/en-US/docs/Web/API/TrustedScript
  • https://developer.mozilla.org/en-US/docs/Web/API/TrustedScriptURL
  • https://developer.mozilla.org/en-US/docs/Web/API/TrustedTypePolicy
  • https://developer.mozilla.org/en-US/docs/Web/API/TrustedTypePolicyFactory
• [ ] If this PR brings the type definitions up to date with a new version of the JS library, update the version number in the header.

[typescript-bot]

@eps1lon Thank you for submitting this PR!

This is a live comment which I will keep updated.

1 package in this PR

• trusted-types — on npm, on unpkg
  • 1 added owner: ✎@eps1lon

@eps1lon: I see that you have added yourself as an owner, are you sure you want to become an owner?

Code Reviews

Because this is a widely-used package, a DT maintainer will need to review it before it can be merged.

You can test the changes of this PR in the Playground.

Status

• ✅ No merge conflicts
• ✅ Continuous integration tests have passed
• 🕐 Most recent commit is approved by a DT maintainer

Once every item on this list is checked, I'll ask you for permission to merge and publish the changes.

---

Diagnostic Information: What the bot saw about this PR

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[typescript-bot]

🔔 @vrana @engelsdamien @Siegrift @bjarkler — please review this PR in the next few days. Be sure to explicitly select Approve or Request Changes in the GitHub UI so I know what's going on.

[DangerBotOSS]

Inspecting the JavaScript source for this package found some properties that are not in the .d.ts files.
The check for missing properties isn't always right, so take this list as advice, not a requirement.

trusted-types (unpkg)

was missing the following properties:

1. TrustedTypePolicy
2. TrustedTypePolicyFactory

Generated by 🚫 dangerJS against b2dda2f