typeof now has string literal union type

sandersn · sandersn · commit d77945fe1f42 · 2017-01-31T10:28:02.000-08:00
Previously, it was just a string
diff --git a/src/compiler/checker.ts b/src/compiler/checker.ts
@@ -14609,7 +14609,9 @@ namespace ts {
 
         function checkTypeOfExpression(node: TypeOfExpression): Type {
             checkExpression(node.expression);
-            return stringType;
+            const types: Type[] = [];
+            typeofEQFacts.forEach((_, s) => types.push(getLiteralTypeForText(TypeFlags.StringLiteral, s)));
+            return getUnionType(types);
         }
 
         function checkVoidExpression(node: VoidExpression): Type {

Original file line number	Diff line number	Diff line change
`@@ -14609,7 +14609,9 @@ namespace ts {`
`14609`	`14609`
`14610`	`14610`	`function checkTypeOfExpression(node: TypeOfExpression): Type {`
`14611`	`14611`	`checkExpression(node.expression);`
`14612`		`- return stringType;`
	`14612`	`+ const types: Type[] = [];`
	`14613`	`+ typeofEQFacts.forEach((_, s) => types.push(getLiteralTypeForText(TypeFlags.StringLiteral, s)));`
	`14614`	`+ return getUnionType(types);`
`14613`	`14615`	`}`
`14614`	`14616`
`14615`	`14617`	`function checkVoidExpression(node: VoidExpression): Type {`