Answer by DerBesondereEin for How to test if two types are exactly the same
If you are looking for a pure typescript solution without any third-party library dependency, this one should work for youexport function assert<T extends never>() {}type...
View ArticleAnswer by Almaju for How to test if two types are exactly the same
I was a bit annoyed that the other propositions imply that I only get false without any detail to understand why it is failing.This is how I solved it for my use case (and it gives readable...
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Answer by Joseph Garrone for How to test if two types are exactly the same
I wrote a library, tsafe, that lets you do that.Thank @jcalz, your answer helped a lot in making this possible!
View ArticleAnswer by Ronald C for How to test if two types are exactly the same
The most robust Equals that I've seen so far (though still not perfect) is this one:type Equals<A, B> = _HalfEquals<A, B> extends true ? _HalfEquals<B, A> : false;type...
View ArticleAnswer by aleclarson for How to test if two types are exactly the same
edit: The most refined version can be found hereHere's the most robust solution I've found thus far:// prettier-ignoretype Exact<A, B> = (<T>() => T extends A ? 1 : 0) extends...
View ArticleAnswer by jcalz for How to test if two types are exactly the same
Ah, the type-level equality operator as requested in microsoft/TypeScript#27024. @MattMcCutchen has come up with a solution, described in a comment on that issue involving generic conditional types...
View ArticleAnswer by Luis H. Moreno for How to test if two types are exactly the same
We should take different approaches depending on the problem. For example, if we know that we're comparing numbers with any, we can use typeof(). If we're comparing interfaces, for example, we can use...
View ArticleHow to test if two types are exactly the same
Here is my first attempt: (playground link)/** Trigger a compiler error when a value is _not_ an exact type. */declare const exactType: <T, U extends T>( draft?: U, expected?: T) => T extends...
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