fix(types): retain union type narrowing with defaults applied

[edison1105]

close #12106

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Size Report

Bundles

File	Size	Gzip	Brotli
runtime-dom.global.prod.js	101 kB	38.1 kB	34.2 kB
vue.global.prod.js	160 kB	58 kB	51.5 kB

Usages

Name	Size	Gzip	Brotli
createApp (CAPI only)	49.1 kB	18.9 kB	17.3 kB
createApp	55.7 kB	21.4 kB	19.6 kB
createSSRApp	59.7 kB	23.1 kB	21 kB
defineCustomElement	60.4 kB	23 kB	20.9 kB
overall	69.4 kB	26.5 kB	24.1 kB

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commit: e88722a

[darkbasic]

Could you please check if it somehow helps with https://github.com/vuejs/core/issues/12110 Thanks

[edison1105]

Could you please check if it somehow helps with #12110 Thanks

I think it is related to language-tool

[darkbasic]

I'd like to cherry-pick both this and https://github.com/vuejs/core/pull/12059 but I get conflicts with https://github.com/vuejs/core/pull/12059/files#diff-ddb3174016350dd4464764b4a1ba232d09ad1e75164d4a37758c759d019202e4

How would you solve it in the context of the other PR?

[yyx990803]

/ecosystem-ci run

[vue-bot]

📝 Ran ecosystem CI: Open

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[yyx990803]

I mistyped the issue number when merging 😓 Amended commit 05685a9d7

[darkbasic]

I guess that https://github.com/vuejs/core/pull/12059 needs to be rebased on top of this to fix the remaining issue, right?