Update the Range type to labeled tuple for improved type hints

[frantic1048]

Labeled tuple is introduced in TypeScript 4.0, which was released in 2020. Compatibility should be fine.

References:

• Official documentation for labeled tuple: link
• Example Range type with labeled tuple on TypeScript Playground: link

[eemeli]

Sounds like a good idea in general, though the current compatibility is with TS 3.9 and later:

yaml/README.md

Lines 17 to 19 in 92821f2

	The minimum supported TypeScript version of the included typings is 3.9;
	for use in earlier versions you may need to set `skipLibCheck: true` in your config.
	This requirement may be updated between minor versions of the library.

Note the last line there; this can change in a minor release. So I'm tempted to accept this, provided that the readme and the CI tests are also updated, but hold off on putting out a release that includes this for a short bit, in case I do actually start properly working on the 3.0 release -- if that advances, introducing this sort-of-breaking-ish change into 2.x is not worthwhile.

[frantic1048]

I understand your concern, especially considering that typescript@3.9 still has ~2M downloads/week (as of Dec 2025). Since this is a subtle change that doesn't affect the core usage of the library, it is reasonable to prioritize compatibility over these enhancements for now.

I just updated the branch to match the current TypeScript tests and ensure CI passes. Feel free to pick this change whenever you feel the time is right :)

[eemeli]

The main branch now contains other breaking changes, including an update to depending on TS 5.9 or later, so this fix can and should be merged.

See inline for a small remaining fix though, as the code comment is now unnecessary.

[eemeli]

Suggested change

/** `[start, value-end, node-end]` */