Introducing JSX syntax support in Typescript opens up new possibilities. I have an expression that functions smoothly with traditional *.ts files, but encounters issues with *.tsx files:
const f = <T1>(arg1: T1) => <T2>(arg2: T2) => {
return { arg1, arg2 };
}
I am curious to know if there is a way to make it work within a *.tsx file?
If you want to make sure it's recognized as a type parameter rather than a JSX element, simply insert a comma following the type parameter:
const f = <T1,>(arg1: T1) => <T2,>(arg2: T2) => {
return { arg1, arg2 };
};
Another option is to utilize function expressions instead:
const f = function<T1>(arg1: T1) {
return function<T2>(arg2: T2) {
return { arg1, arg2 };
};
};
Alternatively, in this particular case, this approach also works:
const f = <T1, T2>(arg1: T1) => (arg2: T2) => {
return { arg1, arg2 };
};
The issue arises from parsing ambiguity, which can be resolved by including an explicit constraint on T1.
const f = <T1 extends unknown>(arg1: T1) => {
return { arg1 };
}
By default, type parameters like T1 have a constraint of unknown. Therefore, in this scenario, your code remains functionally equivalent.
Apply this solution to each arrow function within your original example for optimal results.
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