Add some typing to block-editor utils

[wwahammy]

What?

This continues the effort of typing more of the @wordpress/block-editor package. I worked on two particular files in the src/utils subfolder: object.js and pasting.js

Why?

Potentially improve code quality with more typing in @wordpress/block-editor. Additionally the tsconfig.json for the package says the package is being slowly typed so I figured I'd help 😄

How?

I noticed that the src/utils/object.js file is mostly the same as similar utils file in the global-styles-engine. Given that I figured I'd migrate the file straight to ts so I can reuse the code.

Typing the src/utils/pasting.js file required two small changes to the getPasteEventData function:

1. I needed to set the type of the param to a ClipboardEvent.
2. I needed to add a guard statement for ClipboardEvent is null. If you read the code, the try block will technically catch that situation but TS doesn't realize that. I don't love the use of a guard statement so if there's a better option, I'm for it but it does work. Additionally, pasting is not that common of an event so a single if statement isn't going to have much if any effect on performance.

Testing Instructions

Likely none required, only one functional change, a redundant null check.

Use of AI Tools

None.

[wwahammy]

I found copies of the first two functions in the global-styles-engine so I figured I'd just switch this to typescript like that file and migrate the contents over.

[wwahammy]

This is slightly redundant as the try block would catch when clipboardData is null. Unfortunately, Typescript doesn't realize that so it doesn't know that clipboardData is non-null in the rest of the method. This works around that limitation.

[github-actions]

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[github-actions]

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