Use useSlots().default method to determine whether the slot is in doubt after the contents of the slot have been commented out

[DavidAwing]

Vue version

^3.2.13

Link to minimal reproduction

https://sfc.vuejs.org/#eNqNUctuwjAQ/JXFl4LaOHdIkar2D8rRlzTZQFD8kHdDK6H8e9d5FC5IlSx5H7PjnfFVvYWgLz2qrSqoim1gIOQ+7I1rbfCRAT47z4fyCE30Fp50/u7tOPJknHFFPk0JXhJGG7qSUTIAKOr2MkaGDRczTQJKOpZWWTaBDqeWQE7p5DjPQlFDaLFC8A1UvsYiTzjIshthfmOUx2BCpI3+tlAvahKR2TLoM3knMq8jwdwgo7YwVlJNRKXcqBNzoG2eU1MlpWfSPh5ziXTsHbcWNZLNvqL/JoxCbFSiGIwb5MnFn8eWXqEnTNsTDLOti5+VdyR46X1gU/YdwyusVgt8vdH1VN7BhPUd6s4f10bNDcCflpiSCni+J9rs/vlbS5xmgZHE6ftWKu+FKF2PnR9+AULVzac=

Steps to reproduce

SlotTag Component:

html:

script: const slotDefault = !!useSlots().default; console.log("default exists: " + slotDefault);

App.vue:
html:

browser console output:
default exists: (...args) => {
// If a user calls a compiled slot inside a template expression (#1745), it
// can mess up block tracking, so by default we disable block tracking and
// force bail out whe…

What is expected?

the code for the annotation should not be detected, expecting a undefined value to be returned
Expect the output to be log below:
default exists: false

What is actually happening?

I'm furiously reading the vue design and implementation book, trying to figure out what's going on

System Info

No response

Any additional comments?

No response

[AlexVagrant]

I think you can find why useSlots().default is a function from this line:https://github.com/vuejs/core/blob/main/packages/runtime-core/src/componentSlots.ts#L130.
I hope that can help you.

[puppet-666]

I have the same question.

[puppet-666]

I think you can find why useSlots().default is a function from this line:https://github.com/vuejs/core/blob/main/packages/runtime-core/src/componentSlots.ts#L130. I hope that can help you.

I think the problem is not whether useSlots().default is a function, but whether the comment node can be judged in slot by passing in
my example

[puppet-666]

@DavidAwing
After looking at the compiled result, the comment node is also a case of vnode, so there is no problem with useSlots().default being true. But I still think this performance makes me confused in development ....

[puppet-666]

One more question is: since the comment node vnode is created, why is this comment not mounted when viewing dom?