George Zahariev

Update hermes-parser and related packages in fbsource to 0.21.0

2

Summary: Bump hermes-parser and related packages to [0.21.0](https://github.com/facebook/hermes/blob/main/tools/hermes-parser/js/CHANGELOG.md). Changelog: [internal] Differential Revision: D56857738

## Description Inexact tuple types are like inexact object types - they have a trailing `...` in their element list, e.g. `type T = [number, ...]`. If you have an...

## Description Adds support for Flow's `implies x is T` type guards, along with the basic one and the asserts varient. ## Checklist - [x] I’ve added tests to confirm...