fix(57141): override keyword doesn't check symbol-key class members (#57146)

src/compiler/checker.ts

@@ -45805,7 +45805,7 @@ export function createTypeChecker(host: TypeCheckerHost): TypeChecker {
             hasAbstractModifier(member),
             isStatic(member),
             memberIsParameterProperty,
-            symbolName(declaredProp),
+            declaredProp,
             reportErrors ? member : undefined,
         );
     }
@@ -45829,22 +45829,21 @@ export function createTypeChecker(host: TypeCheckerHost): TypeChecker {
         memberHasAbstractModifier: boolean,
         memberIsStatic: boolean,
         memberIsParameterProperty: boolean,
-        memberName: string,
+        member: Symbol,
         errorNode?: Node,
     ): MemberOverrideStatus {
         const isJs = isInJSFile(node);
         const nodeInAmbientContext = !!(node.flags & NodeFlags.Ambient);
         if (baseWithThis && (memberHasOverrideModifier || compilerOptions.noImplicitOverride)) {
-            const memberEscapedName = escapeLeadingUnderscores(memberName);
             const thisType = memberIsStatic ? staticType : typeWithThis;
             const baseType = memberIsStatic ? baseStaticType : baseWithThis;
-            const prop = getPropertyOfType(thisType, memberEscapedName);
-            const baseProp = getPropertyOfType(baseType, memberEscapedName);
+            const prop = getPropertyOfType(thisType, member.escapedName);
+            const baseProp = getPropertyOfType(baseType, member.escapedName);
 
             const baseClassName = typeToString(baseWithThis);
             if (prop && !baseProp && memberHasOverrideModifier) {
                 if (errorNode) {
-                    const suggestion = getSuggestedSymbolForNonexistentClassMember(memberName, baseType); // Again, using symbol name: note that's different from `symbol.escapedName`
+                    const suggestion = getSuggestedSymbolForNonexistentClassMember(symbolName(member), baseType); // Again, using symbol name: note that's different from `symbol.escapedName`
                     suggestion ?
                         error(
                             errorNode,
@@ -45990,7 +45989,7 @@ export function createTypeChecker(host: TypeCheckerHost): TypeChecker {
             hasAbstractModifier(member),
             isStatic(member),
             /*memberIsParameterProperty*/ false,
-            symbolName(memberSymbol),
+            memberSymbol,
         );
     }
 

tests/baselines/reference/override21.errors.txt

@@ -0,0 +1,13 @@
+override21.ts(5,14): error TS4113: This member cannot have an 'override' modifier because it is not declared in the base class 'A'.
+
+
+==== override21.ts (1 errors) ====
+    const foo = Symbol();
+    class A { }
+    
+    class B extends A {
+        override [foo]() { }
+                 ~~~~~
+!!! error TS4113: This member cannot have an 'override' modifier because it is not declared in the base class 'A'.
+    }
+    

tests/baselines/reference/override21.js

@@ -0,0 +1,18 @@
+//// [tests/cases/conformance/override/override21.ts] ////
+
+//// [override21.ts]
+const foo = Symbol();
+class A { }
+
+class B extends A {
+    override [foo]() { }
+}
+
+
+//// [override21.js]
+const foo = Symbol();
+class A {
+}
+class B extends A {
+    [foo]() { }
+}

tests/baselines/reference/override21.symbols

@@ -0,0 +1,19 @@
+//// [tests/cases/conformance/override/override21.ts] ////
+
+=== override21.ts ===
+const foo = Symbol();
+>foo : Symbol(foo, Decl(override21.ts, 0, 5))
+>Symbol : Symbol(Symbol, Decl(lib.es5.d.ts, --, --), Decl(lib.es2015.symbol.d.ts, --, --), Decl(lib.es2015.symbol.wellknown.d.ts, --, --), Decl(lib.es2019.symbol.d.ts, --, --))
+
+class A { }
+>A : Symbol(A, Decl(override21.ts, 0, 21))
+
+class B extends A {
+>B : Symbol(B, Decl(override21.ts, 1, 11))
+>A : Symbol(A, Decl(override21.ts, 0, 21))
+
+    override [foo]() { }
+>[foo] : Symbol(B[foo], Decl(override21.ts, 3, 19))
+>foo : Symbol(foo, Decl(override21.ts, 0, 5))
+}
+

tests/baselines/reference/override21.types

@@ -0,0 +1,20 @@
+//// [tests/cases/conformance/override/override21.ts] ////
+
+=== override21.ts ===
+const foo = Symbol();
+>foo : unique symbol
+>Symbol() : unique symbol
+>Symbol : SymbolConstructor
+
+class A { }
+>A : A
+
+class B extends A {
+>B : B
+>A : A
+
+    override [foo]() { }
+>[foo] : () => void
+>foo : unique symbol
+}
+

tests/cases/conformance/override/override21.ts

@@ -0,0 +1,9 @@
+// @target: esnext
+// @noImplicitOverride: true
+
+const foo = Symbol();
+class A { }
+
+class B extends A {
+    override [foo]() { }
+}