Add types for built-in iterator

Author: parzhitsky

test/types/record.test.ts

@@ -43,6 +43,9 @@ const record2Entries: IterableIterator<[string, any]> = record2.entries()
 const record1Values: IterableIterator<any> = record1.values()
 const record2Values: IterableIterator<any> = record2.values()
 
+const record1ToArray: any[] = [...record1]
+const record2ToArray: any[] = [...record2]
+
 const record1Has: boolean = record1.has(42)
 const record2Has: boolean = record1.has('key')
 

types/record.d.ts

@@ -39,6 +39,8 @@ declare class Record {
 
   values(): IterableIterator<Object>
 
+  [Symbol.iterator](): IterableIterator<Object>
+
   toObject(): object
 
   get(key: string | number): any