fix(WeakMapConstructor): readonly iterable items (microsoft#43905)

mfulton26 · web-flow · commit 7901f351ebb0 · 2021-05-20T07:18:58.000-07:00
like `MapConstructor`, `WeakMapConstructor` should support receiving `Iterable&lt;readonly [K, V]&gt;` instead of `Iterable&lt;[K, V]&gt;`; otherwise tuples creates with `as const`, etc. cannot be safely passed in without casts, etc.
diff --git a/src/lib/es2015.iterable.d.ts b/src/lib/es2015.iterable.d.ts
@@ -143,7 +143,7 @@ interface MapConstructor {
 interface WeakMap<K extends object, V> { }
 
 interface WeakMapConstructor {
-    new <K extends object, V>(iterable: Iterable<[K, V]>): WeakMap<K, V>;
+    new <K extends object, V>(iterable: Iterable<readonly [K, V]>): WeakMap<K, V>;
 }
 
 interface Set<T> {

Original file line number	Diff line number	Diff line change
`@@ -143,7 +143,7 @@ interface MapConstructor {`
`143`	`143`	`interface WeakMap<K extends object, V> { }`
`144`	`144`
`145`	`145`	`interface WeakMapConstructor {`
`146`		`- new <K extends object, V>(iterable: Iterable<[K, V]>): WeakMap<K, V>;`
	`146`	`+ new <K extends object, V>(iterable: Iterable<readonly [K, V]>): WeakMap<K, V>;`
`147`	`147`	`}`
`148`	`148`
`149`	`149`	`interface Set<T> {`