Remove redundant getStringLiteralType call (#59803)

MichalMarsalek · web-flow · commit d8f6aa7c1f57 · 2025-02-20T10:48:09.000-08:00
diff --git a/src/compiler/checker.ts b/src/compiler/checker.ts
@@ -25935,7 +25935,7 @@ export function createTypeChecker(host: TypeCheckerHost): TypeChecker {
             return !!(target.flags & TypeFlags.Number && isValidNumberString(value, /*roundTripOnly*/ false) ||
                 target.flags & TypeFlags.BigInt && isValidBigIntString(value, /*roundTripOnly*/ false) ||
                 target.flags & (TypeFlags.BooleanLiteral | TypeFlags.Nullable) && value === (target as IntrinsicType).intrinsicName ||
-                target.flags & TypeFlags.StringMapping && isMemberOfStringMapping(getStringLiteralType(value), target) ||
+                target.flags & TypeFlags.StringMapping && isMemberOfStringMapping(source, target) ||
                 target.flags & TypeFlags.TemplateLiteral && isTypeMatchedByTemplateLiteralType(source, target as TemplateLiteralType));
         }
         if (source.flags & TypeFlags.TemplateLiteral) {

Original file line number	Diff line number	Diff line change
`@@ -25935,7 +25935,7 @@ export function createTypeChecker(host: TypeCheckerHost): TypeChecker {`
`25935`	`25935`	`return !!(target.flags & TypeFlags.Number && isValidNumberString(value, /roundTripOnly/ false) \|\|`
`25936`	`25936`	`target.flags & TypeFlags.BigInt && isValidBigIntString(value, /roundTripOnly/ false) \|\|`
`25937`	`25937`	`target.flags & (TypeFlags.BooleanLiteral \| TypeFlags.Nullable) && value === (target as IntrinsicType).intrinsicName \|\|`
`25938`		`- target.flags & TypeFlags.StringMapping && isMemberOfStringMapping(getStringLiteralType(value), target) \|\|`
	`25938`	`+ target.flags & TypeFlags.StringMapping && isMemberOfStringMapping(source, target) \|\|`
`25939`	`25939`	`target.flags & TypeFlags.TemplateLiteral && isTypeMatchedByTemplateLiteralType(source, target as TemplateLiteralType));`
`25940`	`25940`	`}`
`25941`	`25941`	`if (source.flags & TypeFlags.TemplateLiteral) {`