refactor: safely parse emoji shortcodes

[JamieMagee]

Changes

Define and use a schema for type checking emoji shortcodes

Context

This is required for #20553.

One of the rules of @total-typescript/ts-reset changes the return type of JSON.parse from any to unknown¹. This means that we need to do runtime type checking to verify the data that we are parsing.

There are currently a lot of places where we use JSON.parse and each and every one of those will need to be type checked before #20553 can be considered complete.

Documentation (please check one with an [x])

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How I've tested my work (please select one)

I have verified these changes via:

• Code inspection only, or
• Newly added/modified unit tests, or
• No unit tests but ran on a real repository, or
• Both unit tests + ran on a real repository

Footnotes

1. https://github.com/total-typescript/ts-reset#make-jsonparse-return-unknown ↩

[renovate-release]

🎉 This PR is included in version 34.159.2 🎉

The release is available on:

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• 34.159.2

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