naive perf change

PranavSenthilnathan · PranavSenthilnathan · commit 8e76d1644e67 · 2023-10-17T13:28:45.000-07:00
diff --git a/src/compiler/checker.ts b/src/compiler/checker.ts
@@ -16939,7 +16939,7 @@ export function createTypeChecker(host: TypeCheckerHost): TypeChecker {
             if (includes & (TypeFlags.Enum | TypeFlags.Literal | TypeFlags.UniqueESSymbol | TypeFlags.TemplateLiteral | TypeFlags.StringMapping) || includes & TypeFlags.Void && includes & TypeFlags.Undefined) {
                 removeRedundantLiteralTypes(typeSet, includes, !!(unionReduction & UnionReduction.Subtype));
             }
-            if (includes & TypeFlags.StringLiteral && includes & TypeFlags.TemplateLiteral) {
+            if (unionReduction === UnionReduction.Subtype && (includes & TypeFlags.StringLiteral && includes & TypeFlags.TemplateLiteral)) {
                 removeStringLiteralsMatchedByTemplateLiterals(typeSet);
             }
             if (unionReduction === UnionReduction.Subtype) {

Original file line number	Diff line number	Diff line change
`@@ -16939,7 +16939,7 @@ export function createTypeChecker(host: TypeCheckerHost): TypeChecker {`
`16939`	`16939`	`if (includes & (TypeFlags.Enum \| TypeFlags.Literal \| TypeFlags.UniqueESSymbol \| TypeFlags.TemplateLiteral \| TypeFlags.StringMapping) \|\| includes & TypeFlags.Void && includes & TypeFlags.Undefined) {`
`16940`	`16940`	`removeRedundantLiteralTypes(typeSet, includes, !!(unionReduction & UnionReduction.Subtype));`
`16941`	`16941`	`}`
`16942`		`- if (includes & TypeFlags.StringLiteral && includes & TypeFlags.TemplateLiteral) {`
	`16942`	`+ if (unionReduction === UnionReduction.Subtype && (includes & TypeFlags.StringLiteral && includes & TypeFlags.TemplateLiteral)) {`
`16943`	`16943`	`removeStringLiteralsMatchedByTemplateLiterals(typeSet);`
`16944`	`16944`	`}`
`16945`	`16945`	`if (unionReduction === UnionReduction.Subtype) {`