ES2018 RegExp named capture groups not supported with esnext library

[slikts]

TypeScript Version: 2.8.0-dev.20180221

Search Terms: RegExp named capture groups; description

Code

'foo'.match(/(?<bar>foo)/)!.groups

Expected behavior:
It should compile with esnext (ES2018) library compiler option.

Actual behavior:
Property 'groups' does not exist on type 'RegExpMatchArray'.

Playground Link:

Related Issues:

[slikts]

The fix seems to be as simple as:

interface RegExpMatchArray {
  groups?: {
    [key: string]: string
  }
}

[mhegazy]

A PR would be appreciated. We will need a new file src\lib\es2018.regexp.d.ts with the new declaration, and then we will need that wired in jakeFile.js.

[mhegazy]

thanks @YuichiNukiyama !