False-positive "Property does not exist" error in an Object.prototype.hasOwnProperty check block

[Malix-Labs]

🔎 Search Terms

Object Property, hasOwnProperty, if, check, block, scope, error, false-positive

🕗 Version & Regression Information

• This is the behavior in every version I tried, and I reviewed the FAQ for entries about the above tags

⏯ Playground Link

https://www.typescriptlang.org/play?#code/MYewdgzgLgBCBGArApsWBeGBvAUDfMADgE4iHLFQCeAjAFwwBEyAHgJbRtgDmjOAvjhxsAZjAAUeAgHoAVLKkFZMAErIoAV2JgGAMQCGAGwjJF+WdLMIUaAHQALfRADyAdzAAFUuUpVxAchIyCmoAJn8AShwI7DM5BQJzGABRFnI0ZAATBgA5EBTiUmJbMxhlNU1tBkZkwpBiBi9g3xhA7xCqcJhMkGQIGDAQWFYOWHAYanJWrCJ233oYaGIubgBuGH5-WxgAETZMmCoQDRgAW2R9MFagn2oafwB+cVCAVheaCL5EsstE0EgQIZkLZDCBuOJrKgoLYbh1QhFVgIcEA

💻 Code

const object = {
    property1: "existing"
}

if (
    /**
     * Return: False
     */
    object.hasOwnProperty('property2')
) {
    /**
     * Expected: No Error.
     * Return: "Error: Property 'property2' does not exist on type '{ property1: string; }'. Did you mean 'property1'?(2551)"
     */
    console.log(object.property2);
}

🙁 Actual behavior

Error: Property 'property2' does not exist on type '{ property1: string; }'. Did you mean 'property1'?(2551)

🙂 Expected behavior

No error

Additional information about the issue

No response

[MartinJohns]

Duplicate of #41915. Used search terms: hasOwnProperty in:title

Currently hasOwnProperty can not be used to narrow the type of a variable.

[typescript-bot]

This issue has been marked as "Duplicate" and has seen no recent activity. It has been automatically closed for house-keeping purposes.