Add map constructor test.

This proves that the previous commit fixes #37779, as well as that new Map() still types as Map<any, any>.

Author: Pimm

tests/baselines/reference/mapConstructor.js

@@ -0,0 +1,16 @@
+//// [mapConstructor.ts]
+new Map();
+
+const potentiallyUndefinedIterable = [['1', 1], ['2', 2]] as Iterable<[string, number]> | undefined;
+new Map(potentiallyUndefinedIterable);
+
+const potentiallyNullIterable = [['1', 1], ['2', 2]] as Iterable<[string, number]> | null;
+new Map(potentiallyNullIterable);
+
+//// [mapConstructor.js]
+"use strict";
+new Map();
+const potentiallyUndefinedIterable = [['1', 1], ['2', 2]];
+new Map(potentiallyUndefinedIterable);
+const potentiallyNullIterable = [['1', 1], ['2', 2]];
+new Map(potentiallyNullIterable);

tests/baselines/reference/mapConstructor.symbols

@@ -0,0 +1,20 @@
+=== tests/cases/compiler/mapConstructor.ts ===
+new Map();
+>Map : Symbol(Map, Decl(lib.es2015.collection.d.ts, --, --), Decl(lib.es2015.collection.d.ts, --, --), Decl(lib.es2015.iterable.d.ts, --, --), Decl(lib.es2015.symbol.wellknown.d.ts, --, --))
+
+const potentiallyUndefinedIterable = [['1', 1], ['2', 2]] as Iterable<[string, number]> | undefined;
+>potentiallyUndefinedIterable : Symbol(potentiallyUndefinedIterable, Decl(mapConstructor.ts, 2, 5))
+>Iterable : Symbol(Iterable, Decl(lib.es2015.iterable.d.ts, --, --))
+
+new Map(potentiallyUndefinedIterable);
+>Map : Symbol(Map, Decl(lib.es2015.collection.d.ts, --, --), Decl(lib.es2015.collection.d.ts, --, --), Decl(lib.es2015.iterable.d.ts, --, --), Decl(lib.es2015.symbol.wellknown.d.ts, --, --))
+>potentiallyUndefinedIterable : Symbol(potentiallyUndefinedIterable, Decl(mapConstructor.ts, 2, 5))
+
+const potentiallyNullIterable = [['1', 1], ['2', 2]] as Iterable<[string, number]> | null;
+>potentiallyNullIterable : Symbol(potentiallyNullIterable, Decl(mapConstructor.ts, 5, 5))
+>Iterable : Symbol(Iterable, Decl(lib.es2015.iterable.d.ts, --, --))
+
+new Map(potentiallyNullIterable);
+>Map : Symbol(Map, Decl(lib.es2015.collection.d.ts, --, --), Decl(lib.es2015.collection.d.ts, --, --), Decl(lib.es2015.iterable.d.ts, --, --), Decl(lib.es2015.symbol.wellknown.d.ts, --, --))
+>potentiallyNullIterable : Symbol(potentiallyNullIterable, Decl(mapConstructor.ts, 5, 5))
+

tests/baselines/reference/mapConstructor.types

@@ -0,0 +1,38 @@
+=== tests/cases/compiler/mapConstructor.ts ===
+new Map();
+>new Map() : Map<any, any>
+>Map : MapConstructor
+
+const potentiallyUndefinedIterable = [['1', 1], ['2', 2]] as Iterable<[string, number]> | undefined;
+>potentiallyUndefinedIterable : Iterable<[string, number]> | undefined
+>[['1', 1], ['2', 2]] as Iterable<[string, number]> | undefined : Iterable<[string, number]> | undefined
+>[['1', 1], ['2', 2]] : [string, number][]
+>['1', 1] : [string, number]
+>'1' : "1"
+>1 : 1
+>['2', 2] : [string, number]
+>'2' : "2"
+>2 : 2
+
+new Map(potentiallyUndefinedIterable);
+>new Map(potentiallyUndefinedIterable) : Map<string, number>
+>Map : MapConstructor
+>potentiallyUndefinedIterable : Iterable<[string, number]> | undefined
+
+const potentiallyNullIterable = [['1', 1], ['2', 2]] as Iterable<[string, number]> | null;
+>potentiallyNullIterable : Iterable<[string, number]> | null
+>[['1', 1], ['2', 2]] as Iterable<[string, number]> | null : Iterable<[string, number]> | null
+>[['1', 1], ['2', 2]] : [string, number][]
+>['1', 1] : [string, number]
+>'1' : "1"
+>1 : 1
+>['2', 2] : [string, number]
+>'2' : "2"
+>2 : 2
+>null : null
+
+new Map(potentiallyNullIterable);
+>new Map(potentiallyNullIterable) : Map<string, number>
+>Map : MapConstructor
+>potentiallyNullIterable : Iterable<[string, number]> | null
+

tests/cases/compiler/mapConstructor.ts

@@ -0,0 +1,10 @@
+// @strict: true
+// @target: es2015
+
+new Map();
+
+const potentiallyUndefinedIterable = [['1', 1], ['2', 2]] as Iterable<[string, number]> | undefined;
+new Map(potentiallyUndefinedIterable);
+
+const potentiallyNullIterable = [['1', 1], ['2', 2]] as Iterable<[string, number]> | null;
+new Map(potentiallyNullIterable);