[TypeScript] Add missing Headers methods

[retyui]

Summary:

// Hermes runtime (RN 73.x)
console.log({...Headers.prototype})
// result:
{ 
  "append": [Function anonymous], 
  "delete": [Function anonymous], 
  "entries": [Function anonymous], 
  "forEach": [Function anonymous], 
  "get": [Function anonymous], 
  "has": [Function anonymous], 
  "keys": [Function anonymous], 
  "set": [Function anonymous], 
  "values": [Function anonymous], 
  Symbol(Symbol.iterator): [Function anonymous]
}

But in typescript

new Headers().entries() 
// ^^^ Error: Property entries does not exist on type Headers
Object.fromEntries(new Headers())
// ^^^ Error: Property [Symbol.iterator] is missing in type Headers but required in type Iterable<readonly any[]>

Changelog:

[GENERAL] [ADDED] - [TypeScript] Add missing Header methods

Test Plan:

Use code above in your RN project and run yarn tsc --noEmit

[facebook-github-bot]

@arushikesarwani94 has imported this pull request. If you are a Meta employee, you can view this diff on Phabricator.

[facebook-github-bot]

@arushikesarwani94 merged this pull request in 0286151.