diff --git a/tests/baselines/reference/blockScopedNamespaceDifferentFile.js b/tests/baselines/reference/blockScopedNamespaceDifferentFile.js
new file mode 100644
index 00000000000..3eab7477c09
--- /dev/null
+++ b/tests/baselines/reference/blockScopedNamespaceDifferentFile.js
@@ -0,0 +1,35 @@
+//// [tests/cases/compiler/blockScopedNamespaceDifferentFile.ts] ////
+
+//// [test.ts]
+// #15734 failed when test.ts comes before typings.d.ts
+namespace C {
+    export class Name {
+        static funcData = A.AA.func();
+        static someConst = A.AA.foo;
+
+        constructor(parameters) {}
+    }
+}
+
+//// [typings.d.ts]
+declare namespace A {
+    namespace AA {
+        function func(): number;
+        const foo = "";
+    }
+}
+
+
+//// [out.js]
+// #15734 failed when test.ts comes before typings.d.ts
+var C;
+(function (C) {
+    var Name = (function () {
+        function Name(parameters) {
+        }
+        return Name;
+    }());
+    Name.funcData = A.AA.func();
+    Name.someConst = A.AA.foo;
+    C.Name = Name;
+})(C || (C = {}));
diff --git a/tests/baselines/reference/blockScopedNamespaceDifferentFile.symbols b/tests/baselines/reference/blockScopedNamespaceDifferentFile.symbols
new file mode 100644
index 00000000000..b7192d0e12b
--- /dev/null
+++ b/tests/baselines/reference/blockScopedNamespaceDifferentFile.symbols
@@ -0,0 +1,44 @@
+=== tests/cases/compiler/test.ts ===
+// #15734 failed when test.ts comes before typings.d.ts
+namespace C {
+>C : Symbol(C, Decl(test.ts, 0, 0))
+
+    export class Name {
+>Name : Symbol(Name, Decl(test.ts, 1, 13))
+
+        static funcData = A.AA.func();
+>funcData : Symbol(Name.funcData, Decl(test.ts, 2, 23))
+>A.AA.func : Symbol(A.AA.func, Decl(typings.d.ts, 1, 18))
+>A.AA : Symbol(A.AA, Decl(typings.d.ts, 0, 21))
+>A : Symbol(A, Decl(typings.d.ts, 0, 0))
+>AA : Symbol(A.AA, Decl(typings.d.ts, 0, 21))
+>func : Symbol(A.AA.func, Decl(typings.d.ts, 1, 18))
+
+        static someConst = A.AA.foo;
+>someConst : Symbol(Name.someConst, Decl(test.ts, 3, 38))
+>A.AA.foo : Symbol(A.AA.foo, Decl(typings.d.ts, 3, 13))
+>A.AA : Symbol(A.AA, Decl(typings.d.ts, 0, 21))
+>A : Symbol(A, Decl(typings.d.ts, 0, 0))
+>AA : Symbol(A.AA, Decl(typings.d.ts, 0, 21))
+>foo : Symbol(A.AA.foo, Decl(typings.d.ts, 3, 13))
+
+        constructor(parameters) {}
+>parameters : Symbol(parameters, Decl(test.ts, 6, 20))
+    }
+}
+
+=== tests/cases/compiler/typings.d.ts ===
+declare namespace A {
+>A : Symbol(A, Decl(typings.d.ts, 0, 0))
+
+    namespace AA {
+>AA : Symbol(AA, Decl(typings.d.ts, 0, 21))
+
+        function func(): number;
+>func : Symbol(func, Decl(typings.d.ts, 1, 18))
+
+        const foo = "";
+>foo : Symbol(foo, Decl(typings.d.ts, 3, 13))
+    }
+}
+
diff --git a/tests/baselines/reference/blockScopedNamespaceDifferentFile.types b/tests/baselines/reference/blockScopedNamespaceDifferentFile.types
new file mode 100644
index 00000000000..c03d51d2bc4
--- /dev/null
+++ b/tests/baselines/reference/blockScopedNamespaceDifferentFile.types
@@ -0,0 +1,46 @@
+=== tests/cases/compiler/test.ts ===
+// #15734 failed when test.ts comes before typings.d.ts
+namespace C {
+>C : typeof C
+
+    export class Name {
+>Name : Name
+
+        static funcData = A.AA.func();
+>funcData : number
+>A.AA.func() : number
+>A.AA.func : () => number
+>A.AA : typeof A.AA
+>A : typeof A
+>AA : typeof A.AA
+>func : () => number
+
+        static someConst = A.AA.foo;
+>someConst : string
+>A.AA.foo : ""
+>A.AA : typeof A.AA
+>A : typeof A
+>AA : typeof A.AA
+>foo : ""
+
+        constructor(parameters) {}
+>parameters : any
+    }
+}
+
+=== tests/cases/compiler/typings.d.ts ===
+declare namespace A {
+>A : typeof A
+
+    namespace AA {
+>AA : typeof AA
+
+        function func(): number;
+>func : () => number
+
+        const foo = "";
+>foo : ""
+>"" : ""
+    }
+}
+
diff --git a/tests/cases/compiler/blockScopedNamespaceDifferentFile.ts b/tests/cases/compiler/blockScopedNamespaceDifferentFile.ts
new file mode 100644
index 00000000000..4a9fe4a2a85
--- /dev/null
+++ b/tests/cases/compiler/blockScopedNamespaceDifferentFile.ts
@@ -0,0 +1,22 @@
+// @target: es5
+// @outFile: out.js
+// @module: amd
+
+// #15734 failed when test.ts comes before typings.d.ts
+// @Filename: test.ts
+namespace C {
+    export class Name {
+        static funcData = A.AA.func();
+        static someConst = A.AA.foo;
+
+        constructor(parameters) {}
+    }
+}
+
+// @Filename: typings.d.ts
+declare namespace A {
+    namespace AA {
+        function func(): number;
+        const foo = "";
+    }
+}