Array.fromAsync type define on its mapFn missing the index as second argument

[imcotton]

🔎 Search Terms

fromAsync index

🕗 Version & Regression Information

• This changed between versions 5.4 and 5.5
• This changed in commit or PR add Array.fromAsync to esnext #57748
• This is the behavior in every version I tried, and I reviewed the FAQ for entries about Array.fromAsync
• I was unable to test this on prior versions because it only introduced in 5.4

⏯ Playground Link

https://www.typescriptlang.org/play/?target=99&jsx=0&module=0&ts=5.5.4#code/IIJxEME8DoDMQPYFtgGdIDsDGAKA2gAQDk4RANMQEZEEC6FOqALiBQJYYAmApgB4CUBALwA+AjgDeBDj14VmIAgF9+-ANxA

💻 Code

Array.fromAsync([ 'a', 'b' ], (str, index) => ({ index, str }));

🙁 Actual behavior

• Argument of type '(str: any, index: any) => { index: any; str: any; }' is not assignable to parameter of type '(value: string) => { index: any; str: any; }'.
  Target signature provides too few arguments. Expected 2 or more, but got 1.
• Parameter 'str' implicitly has an 'any' type.
• Parameter 'index' implicitly has an 'any' type.

🙂 Expected behavior

index typed as number

Additional information about the issue

• https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/Array/fromAsync#mapfn
• https://github.com/zloirock/core-js?tab=readme-ov-file#arrayfromasync