Type 'BigInt' cannot be used as an index type

[philippotto]

Bug Report

🔎 Search Terms

BigInt, indexing, Type 'BigInt' does not satisfy the constraint 'string | number | symbol'.

🕗 Version & Regression Information

• This is the behavior in every version I tried (that supports BigInt), and I reviewed the FAQ for entries about BigInt

⏯ Playground Link

Playground link with relevant code

💻 Code

const num: bigint = 50000000000000n;
const record: Record<bigint, bigint> = {};

record[num] = num;

console.log(record[num] + 10n);

🙁 Actual behavior

TypeScript reports three errors:

Type 'BigInt' does not satisfy the constraint 'string | number | symbol'.
Type 'BigInt' cannot be used as an index type.
Type 'BigInt' cannot be used as an index type.

🙂 Expected behavior

No errors should be reported as BigInts can in fact be used as an index type in JS.

[MartinJohns]

Duplicate of #46395. Used search terms: bigint in:title

[philippotto]

Sorry about that! Since the exact search for the error messages ("BigInt cannot be used as an index type." and 'BigInt' does not satisfy the constraint 'string | number | symbol') didn't bring up anything, I assumed, that this wasn't reported yet. I'll close this duplicate now.