Ensure type/namespaceish statics are included in the list of namespace merge members

src/compiler/checker.ts

@@ -6510,7 +6510,8 @@ namespace ts {
                 }
 
                 function isNamespaceMember(p: Symbol) {
-                    return !(p.flags & SymbolFlags.Prototype || p.escapedName === "prototype" || p.valueDeclaration && isClassLike(p.valueDeclaration.parent));
+                    return !!(p.flags & (SymbolFlags.Type | SymbolFlags.Namespace | SymbolFlags.Alias)) ||
+                        !(p.flags & SymbolFlags.Prototype || p.escapedName === "prototype" || p.valueDeclaration && isClassLike(p.valueDeclaration.parent));
                 }
 
                 function serializeAsClass(symbol: Symbol, localName: string, modifierFlags: ModifierFlags) {

tests/baselines/reference/jsDeclarationsClassStaticMethodAugmentation.js

@@ -0,0 +1,30 @@
+//// [source.js]
+export class Clazz {
+    static method() { }
+}
+
+Clazz.method.prop = 5;
+
+//// [source.js]
+"use strict";
+Object.defineProperty(exports, "__esModule", { value: true });
+exports.Clazz = void 0;
+var Clazz = /** @class */ (function () {
+    function Clazz() {
+    }
+    Clazz.method = function () { };
+    return Clazz;
+}());
+exports.Clazz = Clazz;
+Clazz.method.prop = 5;
+
+
+//// [source.d.ts]
+export class Clazz {
+}
+export namespace Clazz {
+    function method(): void;
+    namespace method {
+        const prop: number;
+    }
+}

tests/baselines/reference/jsDeclarationsClassStaticMethodAugmentation.symbols

@@ -0,0 +1,15 @@
+=== tests/cases/conformance/jsdoc/declarations/source.js ===
+export class Clazz {
+>Clazz : Symbol(Clazz, Decl(source.js, 0, 0), Decl(source.js, 2, 1))
+
+    static method() { }
+>method : Symbol(Clazz.method, Decl(source.js, 0, 20), Decl(source.js, 4, 6))
+}
+
+Clazz.method.prop = 5;
+>Clazz.method.prop : Symbol(Clazz.method.prop, Decl(source.js, 2, 1))
+>Clazz.method : Symbol(Clazz.method, Decl(source.js, 0, 20), Decl(source.js, 4, 6))
+>Clazz : Symbol(Clazz, Decl(source.js, 0, 0), Decl(source.js, 2, 1))
+>method : Symbol(Clazz.method, Decl(source.js, 0, 20), Decl(source.js, 4, 6))
+>prop : Symbol(Clazz.method.prop, Decl(source.js, 2, 1))
+

tests/baselines/reference/jsDeclarationsClassStaticMethodAugmentation.types

@@ -0,0 +1,17 @@
+=== tests/cases/conformance/jsdoc/declarations/source.js ===
+export class Clazz {
+>Clazz : Clazz
+
+    static method() { }
+>method : typeof Clazz.method
+}
+
+Clazz.method.prop = 5;
+>Clazz.method.prop = 5 : 5
+>Clazz.method.prop : number
+>Clazz.method : typeof Clazz.method
+>Clazz : typeof Clazz
+>method : typeof Clazz.method
+>prop : number
+>5 : 5
+

tests/cases/conformance/jsdoc/declarations/jsDeclarationsClassStaticMethodAugmentation.ts

@@ -0,0 +1,11 @@
+// @allowJs: true
+// @checkJs: true
+// @target: es5
+// @outDir: ./out
+// @declaration: true
+// @filename: source.js
+export class Clazz {
+    static method() { }
+}
+
+Clazz.method.prop = 5;