fix property completion in unions of object types and template literal types (#52196)

Author: Tobias-Scholz

src/compiler/types.ts

@@ -6053,7 +6053,7 @@ export const enum TypeFlags {
     /** @internal */
     Intrinsic = Any | Unknown | String | Number | BigInt | Boolean | BooleanLiteral | ESSymbol | Void | Undefined | Null | Never | NonPrimitive,
     /** @internal */
-    Primitive = String | Number | BigInt | Boolean | Enum | EnumLiteral | ESSymbol | Void | Undefined | Null | Literal | UniqueESSymbol,
+    Primitive = String | Number | BigInt | Boolean | Enum | EnumLiteral | ESSymbol | Void | Undefined | Null | Literal | UniqueESSymbol | TemplateLiteral,
     StringLike = String | StringLiteral | TemplateLiteral | StringMapping,
     NumberLike = Number | NumberLiteral | Enum,
     BigIntLike = BigInt | BigIntLiteral,

tests/cases/fourslash/completionsObjectLiteralUnionTemplateLiteralType.ts

@@ -0,0 +1,26 @@
+/// <reference path="fourslash.ts" />
+
+////type UnionType = {
+////  key1: string;
+////} | {
+////  key2: number;
+////} | `string literal ${string}`;
+////
+////const obj1: UnionType = {
+////  /*1*/
+////};
+////
+////const obj2: UnionType = {
+////  key1: "abc",
+////  /*2*/
+////};
+
+verify.completions({
+    marker: '1',
+    exact: [{ name: 'key1' }, { name: 'key2' }]
+})
+
+verify.completions({
+    marker: '2',
+    exact: [{ name: 'key2' }]
+})