fix(60484): Implementing a prim type in a class expression should report error

src/compiler/checker.ts

@@ -3458,10 +3458,10 @@ export function createTypeChecker(host: TypeCheckerHost): TypeChecker {
                     if (containerKind === SyntaxKind.InterfaceDeclaration && heritageKind === SyntaxKind.ExtendsKeyword) {
                         error(errorLocation, Diagnostics.An_interface_cannot_extend_a_primitive_type_like_0_It_can_only_extend_other_named_object_types, unescapeLeadingUnderscores(name));
                     }
-                    else if (containerKind === SyntaxKind.ClassDeclaration && heritageKind === SyntaxKind.ExtendsKeyword) {
+                    else if (isClassLike(grandparent.parent) && heritageKind === SyntaxKind.ExtendsKeyword) {
                         error(errorLocation, Diagnostics.A_class_cannot_extend_a_primitive_type_like_0_Classes_can_only_extend_constructable_values, unescapeLeadingUnderscores(name));
                     }
-                    else if (containerKind === SyntaxKind.ClassDeclaration && heritageKind === SyntaxKind.ImplementsKeyword) {
+                    else if (isClassLike(grandparent.parent) && heritageKind === SyntaxKind.ImplementsKeyword) {
                         error(errorLocation, Diagnostics.A_class_cannot_implement_a_primitive_type_like_0_It_can_only_implement_other_named_object_types, unescapeLeadingUnderscores(name));
                     }
                 }

tests/baselines/reference/classImplementsPrimitive.errors.txt

@@ -1,9 +1,15 @@
 classImplementsPrimitive.ts(3,20): error TS2864: A class cannot implement a primitive type like 'number'. It can only implement other named object types.
 classImplementsPrimitive.ts(4,21): error TS2864: A class cannot implement a primitive type like 'string'. It can only implement other named object types.
 classImplementsPrimitive.ts(5,21): error TS2864: A class cannot implement a primitive type like 'boolean'. It can only implement other named object types.
+classImplementsPrimitive.ts(7,29): error TS2864: A class cannot implement a primitive type like 'number'. It can only implement other named object types.
+classImplementsPrimitive.ts(8,29): error TS2864: A class cannot implement a primitive type like 'string'. It can only implement other named object types.
+classImplementsPrimitive.ts(9,29): error TS2864: A class cannot implement a primitive type like 'boolean'. It can only implement other named object types.
+classImplementsPrimitive.ts(11,31): error TS2864: A class cannot implement a primitive type like 'number'. It can only implement other named object types.
+classImplementsPrimitive.ts(12,31): error TS2864: A class cannot implement a primitive type like 'string'. It can only implement other named object types.
+classImplementsPrimitive.ts(13,31): error TS2864: A class cannot implement a primitive type like 'boolean'. It can only implement other named object types.
 
 
-==== classImplementsPrimitive.ts (3 errors) ====
+==== classImplementsPrimitive.ts (9 errors) ====
     // classes cannot implement primitives
 
     class C implements number { }
@@ -14,4 +20,25 @@ classImplementsPrimitive.ts(5,21): error TS2864: A class cannot implement a prim
 !!! error TS2864: A class cannot implement a primitive type like 'string'. It can only implement other named object types.
     class C3 implements boolean { }
                         ~~~~~~~
-!!! error TS2864: A class cannot implement a primitive type like 'boolean'. It can only implement other named object types.
+!!! error TS2864: A class cannot implement a primitive type like 'boolean'. It can only implement other named object types.
+
+    const C4 = class implements number {}
+                                ~~~~~~
+!!! error TS2864: A class cannot implement a primitive type like 'number'. It can only implement other named object types.
+    const C5 = class implements string {}
+                                ~~~~~~
+!!! error TS2864: A class cannot implement a primitive type like 'string'. It can only implement other named object types.
+    const C6 = class implements boolean {}
+                                ~~~~~~~
+!!! error TS2864: A class cannot implement a primitive type like 'boolean'. It can only implement other named object types.
+
+    const C7 = class A implements number { }
+                                  ~~~~~~
+!!! error TS2864: A class cannot implement a primitive type like 'number'. It can only implement other named object types.
+    const C8 = class B implements string { }
+                                  ~~~~~~
+!!! error TS2864: A class cannot implement a primitive type like 'string'. It can only implement other named object types.
+    const C9 = class C implements boolean { }
+                                  ~~~~~~~
+!!! error TS2864: A class cannot implement a primitive type like 'boolean'. It can only implement other named object types.
+

tests/baselines/reference/classImplementsPrimitive.js

@@ -5,7 +5,16 @@
 
 class C implements number { }
 class C2 implements string { }
-class C3 implements boolean { }
+class C3 implements boolean { }
+
+const C4 = class implements number {}
+const C5 = class implements string {}
+const C6 = class implements boolean {}
+
+const C7 = class A implements number { }
+const C8 = class B implements string { }
+const C9 = class C implements boolean { }
+
 
 //// [classImplementsPrimitive.js]
 // classes cannot implement primitives
@@ -24,3 +33,33 @@ var C3 = /** @class */ (function () {
     }
     return C3;
 }());
+var C4 = /** @class */ (function () {
+    function class_1() {
+    }
+    return class_1;
+}());
+var C5 = /** @class */ (function () {
+    function class_2() {
+    }
+    return class_2;
+}());
+var C6 = /** @class */ (function () {
+    function class_3() {
+    }
+    return class_3;
+}());
+var C7 = /** @class */ (function () {
+    function A() {
+    }
+    return A;
+}());
+var C8 = /** @class */ (function () {
+    function B() {
+    }
+    return B;
+}());
+var C9 = /** @class */ (function () {
+    function C() {
+    }
+    return C;
+}());

tests/baselines/reference/classImplementsPrimitive.symbols

@@ -12,3 +12,24 @@ class C2 implements string { }
 class C3 implements boolean { }
 >C3 : Symbol(C3, Decl(classImplementsPrimitive.ts, 3, 30))
 
+const C4 = class implements number {}
+>C4 : Symbol(C4, Decl(classImplementsPrimitive.ts, 6, 5))
+
+const C5 = class implements string {}
+>C5 : Symbol(C5, Decl(classImplementsPrimitive.ts, 7, 5))
+
+const C6 = class implements boolean {}
+>C6 : Symbol(C6, Decl(classImplementsPrimitive.ts, 8, 5))
+
+const C7 = class A implements number { }
+>C7 : Symbol(C7, Decl(classImplementsPrimitive.ts, 10, 5))
+>A : Symbol(A, Decl(classImplementsPrimitive.ts, 10, 10))
+
+const C8 = class B implements string { }
+>C8 : Symbol(C8, Decl(classImplementsPrimitive.ts, 11, 5))
+>B : Symbol(B, Decl(classImplementsPrimitive.ts, 11, 10))
+
+const C9 = class C implements boolean { }
+>C9 : Symbol(C9, Decl(classImplementsPrimitive.ts, 12, 5))
+>C : Symbol(C, Decl(classImplementsPrimitive.ts, 12, 10))
+

tests/baselines/reference/classImplementsPrimitive.types

@@ -15,3 +15,45 @@ class C3 implements boolean { }
 >C3 : C3
 >   : ^^
 
+const C4 = class implements number {}
+>C4 : typeof C4
+>   : ^^^^^^^^^
+>class implements number {} : typeof C4
+>                           : ^^^^^^^^^
+
+const C5 = class implements string {}
+>C5 : typeof C5
+>   : ^^^^^^^^^
+>class implements string {} : typeof C5
+>                           : ^^^^^^^^^
+
+const C6 = class implements boolean {}
+>C6 : typeof C6
+>   : ^^^^^^^^^
+>class implements boolean {} : typeof C6
+>                            : ^^^^^^^^^
+
+const C7 = class A implements number { }
+>C7 : typeof A
+>   : ^^^^^^^^
+>class A implements number { } : typeof A
+>                              : ^^^^^^^^
+>A : typeof A
+>  : ^^^^^^^^
+
+const C8 = class B implements string { }
+>C8 : typeof B
+>   : ^^^^^^^^
+>class B implements string { } : typeof B
+>                              : ^^^^^^^^
+>B : typeof B
+>  : ^^^^^^^^
+
+const C9 = class C implements boolean { }
+>C9 : typeof C
+>   : ^^^^^^^^
+>class C implements boolean { } : typeof C
+>                               : ^^^^^^^^
+>C : typeof C
+>  : ^^^^^^^^
+

tests/cases/compiler/classImplementsPrimitive.ts

@@ -2,4 +2,12 @@
 
 class C implements number { }
 class C2 implements string { }
-class C3 implements boolean { }
+class C3 implements boolean { }
+
+const C4 = class implements number {}
+const C5 = class implements string {}
+const C6 = class implements boolean {}
+
+const C7 = class A implements number { }
+const C8 = class B implements string { }
+const C9 = class C implements boolean { }