typeof x === undefined does not raise a type error #42791

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Jack-Works opened this issue Feb 13, 2021 · 2 comments

Contributor

Jack-Works commented Feb 13, 2021

Bug Report

As title describes

🔎 Search Terms

typeof undefined

🕗 Version & Regression Information

Happened in nightly

⏯ Playground Link

https://www.typescriptlang.org/play?ts=4.3.0-dev.20210213#code/C4TwDgpg9gZgBAIgXAvGuBXAdgEwjASywhyA

💻 Code

typeof "" === undefined

🙁 Actual behavior

Nothing

🙂 Expected behavior

undefined is not comparable with string

Contributor

MartinJohns commented Feb 13, 2021

Duplicate of #29405 / #29200. Used search terms: typeof undefined in:title

Contributor Author

Jack-Works commented Feb 13, 2021

oh, I didn't search them in closed issues. let me read it

Jack-Works closed this as completed

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