Non-namespace merges override valueDeclaration

Instead of searching `declarations` for a class declaration, make the
binder and checker merge `valueDeclaration` such that non-namespace merges
always have their `valueDeclaration` win.

tests/baselines/reference/ambientClassDeclarationWithExtends.js

@@ -1,4 +1,6 @@
-//// [ambientClassDeclarationWithExtends.ts]
+//// [tests/cases/compiler/ambientClassDeclarationWithExtends.ts] ////
+
+//// [ambientClassDeclarationExtends_singleFile.ts]
 declare class A { }
 declare class B extends A { }
 
@@ -10,10 +12,29 @@ declare class D extends C { }
 
 var d: C = new D();
 
+//// [ambientClassDeclarationExtends_file1.ts]
+
+declare class E {
+    public bar;
+}
+namespace F { var y; }
 
-//// [ambientClassDeclarationWithExtends.js]
+//// [ambientClassDeclarationExtends_file2.ts]
+
+declare class F extends E { }
+var f: E = new F();
+
+
+//// [ambientClassDeclarationExtends_singleFile.js]
 var D;
 (function (D) {
     var x;
 })(D || (D = {}));
 var d = new D();
+//// [ambientClassDeclarationExtends_file1.js]
+var F;
+(function (F) {
+    var y;
+})(F || (F = {}));
+//// [ambientClassDeclarationExtends_file2.js]
+var f = new F();

tests/baselines/reference/ambientClassDeclarationWithExtends.symbols

@@ -1,27 +1,50 @@
-=== tests/cases/compiler/ambientClassDeclarationWithExtends.ts ===
+=== tests/cases/compiler/ambientClassDeclarationExtends_singleFile.ts ===
 declare class A { }
->A : Symbol(A, Decl(ambientClassDeclarationWithExtends.ts, 0, 0))
+>A : Symbol(A, Decl(ambientClassDeclarationExtends_singleFile.ts, 0, 0))
 
 declare class B extends A { }
->B : Symbol(B, Decl(ambientClassDeclarationWithExtends.ts, 0, 19))
->A : Symbol(A, Decl(ambientClassDeclarationWithExtends.ts, 0, 0))
+>B : Symbol(B, Decl(ambientClassDeclarationExtends_singleFile.ts, 0, 19))
+>A : Symbol(A, Decl(ambientClassDeclarationExtends_singleFile.ts, 0, 0))
 
 declare class C {
->C : Symbol(C, Decl(ambientClassDeclarationWithExtends.ts, 1, 29))
+>C : Symbol(C, Decl(ambientClassDeclarationExtends_singleFile.ts, 1, 29))
 
     public foo;
->foo : Symbol(foo, Decl(ambientClassDeclarationWithExtends.ts, 3, 17))
+>foo : Symbol(foo, Decl(ambientClassDeclarationExtends_singleFile.ts, 3, 17))
 }
 namespace D { var x; }
->D : Symbol(D, Decl(ambientClassDeclarationWithExtends.ts, 5, 1), Decl(ambientClassDeclarationWithExtends.ts, 6, 22))
->x : Symbol(x, Decl(ambientClassDeclarationWithExtends.ts, 6, 17))
+>D : Symbol(D, Decl(ambientClassDeclarationExtends_singleFile.ts, 5, 1), Decl(ambientClassDeclarationExtends_singleFile.ts, 6, 22))
+>x : Symbol(x, Decl(ambientClassDeclarationExtends_singleFile.ts, 6, 17))
 
 declare class D extends C { }
->D : Symbol(D, Decl(ambientClassDeclarationWithExtends.ts, 5, 1), Decl(ambientClassDeclarationWithExtends.ts, 6, 22))
->C : Symbol(C, Decl(ambientClassDeclarationWithExtends.ts, 1, 29))
+>D : Symbol(D, Decl(ambientClassDeclarationExtends_singleFile.ts, 5, 1), Decl(ambientClassDeclarationExtends_singleFile.ts, 6, 22))
+>C : Symbol(C, Decl(ambientClassDeclarationExtends_singleFile.ts, 1, 29))
 
 var d: C = new D();
->d : Symbol(d, Decl(ambientClassDeclarationWithExtends.ts, 9, 3))
->C : Symbol(C, Decl(ambientClassDeclarationWithExtends.ts, 1, 29))
->D : Symbol(D, Decl(ambientClassDeclarationWithExtends.ts, 5, 1), Decl(ambientClassDeclarationWithExtends.ts, 6, 22))
+>d : Symbol(d, Decl(ambientClassDeclarationExtends_singleFile.ts, 9, 3))
+>C : Symbol(C, Decl(ambientClassDeclarationExtends_singleFile.ts, 1, 29))
+>D : Symbol(D, Decl(ambientClassDeclarationExtends_singleFile.ts, 5, 1), Decl(ambientClassDeclarationExtends_singleFile.ts, 6, 22))
+
+=== tests/cases/compiler/ambientClassDeclarationExtends_file1.ts ===
+
+declare class E {
+>E : Symbol(E, Decl(ambientClassDeclarationExtends_file1.ts, 0, 0))
+
+    public bar;
+>bar : Symbol(bar, Decl(ambientClassDeclarationExtends_file1.ts, 1, 17))
+}
+namespace F { var y; }
+>F : Symbol(F, Decl(ambientClassDeclarationExtends_file1.ts, 3, 1), Decl(ambientClassDeclarationExtends_file2.ts, 0, 0))
+>y : Symbol(y, Decl(ambientClassDeclarationExtends_file1.ts, 4, 17))
+
+=== tests/cases/compiler/ambientClassDeclarationExtends_file2.ts ===
+
+declare class F extends E { }
+>F : Symbol(F, Decl(ambientClassDeclarationExtends_file1.ts, 3, 1), Decl(ambientClassDeclarationExtends_file2.ts, 0, 0))
+>E : Symbol(E, Decl(ambientClassDeclarationExtends_file1.ts, 0, 0))
+
+var f: E = new F();
+>f : Symbol(f, Decl(ambientClassDeclarationExtends_file2.ts, 2, 3))
+>E : Symbol(E, Decl(ambientClassDeclarationExtends_file1.ts, 0, 0))
+>F : Symbol(F, Decl(ambientClassDeclarationExtends_file1.ts, 3, 1), Decl(ambientClassDeclarationExtends_file2.ts, 0, 0))
 

tests/baselines/reference/ambientClassDeclarationWithExtends.types

@@ -1,4 +1,4 @@
-=== tests/cases/compiler/ambientClassDeclarationWithExtends.ts ===
+=== tests/cases/compiler/ambientClassDeclarationExtends_singleFile.ts ===
 declare class A { }
 >A : A
 
@@ -26,3 +26,27 @@ var d: C = new D();
 >new D() : D
 >D : typeof D
 
+=== tests/cases/compiler/ambientClassDeclarationExtends_file1.ts ===
+
+declare class E {
+>E : E
+
+    public bar;
+>bar : any
+}
+namespace F { var y; }
+>F : typeof F
+>y : any
+
+=== tests/cases/compiler/ambientClassDeclarationExtends_file2.ts ===
+
+declare class F extends E { }
+>F : F
+>E : E
+
+var f: E = new F();
+>f : E
+>E : E
+>new F() : F
+>F : typeof F
+

tests/cases/compiler/ambientClassDeclarationWithExtends.ts

@@ -1,3 +1,4 @@
+// @Filename: ambientClassDeclarationExtends_singleFile.ts
 declare class A { }
 declare class B extends A { }
 
@@ -8,3 +9,15 @@ namespace D { var x; }
 declare class D extends C { }
 
 var d: C = new D();
+
+// @Filename: ambientClassDeclarationExtends_file1.ts
+
+declare class E {
+    public bar;
+}
+namespace F { var y; }
+
+// @Filename: ambientClassDeclarationExtends_file2.ts
+
+declare class F extends E { }
+var f: E = new F();