TypeScript Version: 3.7.2

Search Terms: RegExpMatchArray, input, index, length, regexp, regex, result objects

Code

const match = 'a'.match(/a/)
if ( match ) console.log(match.input.includes('a'), match.index.toFixed(2))

Expected behavior: It to work.

Actual behavior: Type checks fails because RegExpMatchArray does not define index and input

Playground Link: Playground Link

Related Issues: none

For reference of the index and input properties, see:

RegExp result objects have some non-numerical properties already, which named capture groups may overlap with, namely length, index and input.

https://github.com/tc39/proposal-regexp-named-groups