The slots objectless prototype function obtained by useSlots

[jevin98]

Vue version

latest

Link to minimal reproduction

https://play.vuejs.org/#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

Steps to reproduce

2.4.24

2.4.23

What is expected?

slots.hasOwnProperty No error reported

What is actually happening?

System Info

No response

Any additional comments?

No response

[dage212]

vue object is used Proxy wrapped，xx.hasOwnProperty can emit proxy interception

[jevin98]

vue object is used Proxy wrapped，xx.hasOwnProperty can emit proxy interception

Do you understand what my problem is?

[jacekkarczmarczyk]

What is expected?

slots.hasOwnProperty No error reported

There's no error

[jevin98]

hasOwnProperty

The latest version of vue in the playground will indeed report an error.

[Disservin]

hasOwnProperty

The latest version of vue in the playground will indeed report an error.

I think you should rather use console.log(Object.hasOwn(slots, 'a')), hasOwnProperty has a few issues and one should prefer hasOwn

[jevin98]

Proxy
Thanks, However, in 3.4.24, there is no answer to the question why the function of the object on the prototype of slots disappeared.

[Disservin]

Proxy
Thanks, However, in 3.4.24, there is no answer to the question why the function of the object on the prototype of slots disappeared.

A quick google search would answer this. https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/Object/hasOwn#problematic_cases_for_hasownproperty, meaning when the object is created with Object.create(null) hasOwnProperty will fail. Simply use the other method..

[jevin98]

hasOwnProperty

Sorry, hasOwnProperty can still be used normally in this place in 3.4.23. So I'm not sure if there is a problem after upgrading to 3.4.24.

[Disservin]

What? You have previously shown that there is an error, so there definitely will be a problem for you after upgrading? This is very likely due to some internal vue change which uses the Object.create(null) syntax, but this is fixable if you just use hasOwn. Any good js linter will probably tell you not to use the raw hasOwnProperty.

[jevin98]

What? You have previously shown that there is an error, so there definitely will be a problem for you after upgrading? This is very likely due to some internal vue change which uses the Object.create(null) syntax, but this is fixable if you just use hasOwn. Any good js linter will probably tell you not to use the raw hasOwnProperty.

Okay, I understand, thanks for your reply.

[Disservin]

Ah I think Evan might have just “fixed“ this 064e82f but still use hasOwn

[jevin98]

Ah I think Evan might have just “fixed“ this 064e82f but still use hasOwn

Yes. If I had used hasOwn from the beginning there would be no problem.