type X = {[K in '1' | '2']: string} // valid
type Y = {[K in 1 | 2]: string} // invalid
https://i.sstatic.net/8iBoK.png
Could there be a legitimate explanation for this inconsistency? I couldn't find any related problem on github, so I thought of reaching out here first.
The key of a JavaScript object is always considered to be a string, even if it's specified as an integer. This means that when accessing a key in an object, you can use either a string or an integer and the correct result will still be returned.
var b = {1:15};
console.log(b[1]);
console.log(b['1']);
However, it's important to note that JavaScript performs strict type checking in certain scenarios. For example:
parseInt(false);
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