Generic functions with default parameters in TSX error out

[thatsmydoing]

In esbuild 0.14.49, the following code in a tsx file

const foo = <T = unknown>(t: T) => null;

throws the following error

✘ [ERROR] Expected ">" but found "="

    index.tsx:1:15:
      1 │ const foo = <T = unknown>(t: T) => null;
        │                ^
        ╵                >

1 error

In typescript 4.7.4, the above compiles just fine.

For our particular case, we can workaround it by using the alternative generics in TSX workaround of using a comma but that doesn't apply to all cases.

const foo = <T,>(t: T) => null;

[evanw]

Thanks for the report. It looks like this changed relatively recently: microsoft/TypeScript#47062. This will need to be changed in esbuild as well to match.