Use IterableIterator, not MapIterator

[machty]

Some reason the current volar package uses the non-existent MapIterator when it should be using IterableIterator. This is causing my local TS compilation to fail. I'm not sure why others aren't encountering it.

https://unpkg.com/@volar/[email protected]/lib/utils.d.ts

Perhaps this PR will fix it; then again, in my local of the Volar library, it correctly generates IterableIterator, so I don't have a way of testing this fix.

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commit: 03ebaac

[jasonlyu123]

MapIterator is a new type introduced in TypeScript 5.6 https://devblogs.microsoft.com/typescript/announcing-typescript-5-6/#strict-builtin-iterator-checks-(and---strictbuiltiniteratorreturn)

[machty]

MapIterator is a new type introduced in TypeScript 5.6 https://devblogs.microsoft.com/typescript/announcing-typescript-5-6/#strict-builtin-iterator-checks-(and---strictbuiltiniteratorreturn)

Hmm, sounds like the solution then is to bump our dependency on TypeScript.

Volar seems to hug new versions of TS pretty closely; does that mean everyone using Vue tooling is constantly upgrading TS? Or does the tooling use its own version of TS separate from the project workspace?

[machty]

ah I can just use lib: "ES2021" or some earlier version than ESNext with a newer version of TS and it won't complain