diff --git a/src/compiler/emitter.ts b/src/compiler/emitter.ts
index a633da81597..abcc32c1198 100644
--- a/src/compiler/emitter.ts
+++ b/src/compiler/emitter.ts
@@ -1552,6 +1552,9 @@ var __awaiter = (this && this.__awaiter) || function (thisArg, _arguments, Promi
                 else if (isNameOfNestedRedeclaration(node)) {
                     write(getGeneratedNameForNode(node));
                 }
+                else if (nodeIsSynthesized(node)) {
+                    write(node.text);
+                }
                 else {
                     writeTextOfNode(currentSourceFile, node);
                 }
diff --git a/tests/baselines/reference/decoratorMetadataWithImportDeclarationNameCollision3.js b/tests/baselines/reference/decoratorMetadataWithImportDeclarationNameCollision3.js
new file mode 100644
index 00000000000..b219bba4102
--- /dev/null
+++ b/tests/baselines/reference/decoratorMetadataWithImportDeclarationNameCollision3.js
@@ -0,0 +1,51 @@
+//// [tests/cases/compiler/decoratorMetadataWithImportDeclarationNameCollision3.ts] ////
+
+//// [db.ts]
+export class db {
+    public doSomething() {
+    }
+}
+
+//// [service.ts]
+import db = require('./db');
+function someDecorator(target) {
+    return target;
+}
+@someDecorator
+class MyClass {
+    db: db.db;
+
+    constructor(db: db.db) { // collision with namespace of external module db
+        this.db = db;
+        this.db.doSomething();
+    }
+}
+export {MyClass};
+
+
+//// [db.js]
+var db = (function () {
+    function db() {
+    }
+    db.prototype.doSomething = function () {
+    };
+    return db;
+})();
+exports.db = db;
+//// [service.js]
+var db = require('./db');
+function someDecorator(target) {
+    return target;
+}
+var MyClass = (function () {
+    function MyClass(db) {
+        this.db = db;
+        this.db.doSomething();
+    }
+    MyClass = __decorate([
+        someDecorator, 
+        __metadata('design:paramtypes', [db.db])
+    ], MyClass);
+    return MyClass;
+})();
+exports.MyClass = MyClass;
diff --git a/tests/baselines/reference/decoratorMetadataWithImportDeclarationNameCollision3.symbols b/tests/baselines/reference/decoratorMetadataWithImportDeclarationNameCollision3.symbols
new file mode 100644
index 00000000000..b34468c7bd5
--- /dev/null
+++ b/tests/baselines/reference/decoratorMetadataWithImportDeclarationNameCollision3.symbols
@@ -0,0 +1,53 @@
+=== tests/cases/compiler/service.ts ===
+import db = require('./db');
+>db : Symbol(db, Decl(service.ts, 0, 0))
+
+function someDecorator(target) {
+>someDecorator : Symbol(someDecorator, Decl(service.ts, 0, 28))
+>target : Symbol(target, Decl(service.ts, 1, 23))
+
+    return target;
+>target : Symbol(target, Decl(service.ts, 1, 23))
+}
+@someDecorator
+>someDecorator : Symbol(someDecorator, Decl(service.ts, 0, 28))
+
+class MyClass {
+>MyClass : Symbol(MyClass, Decl(service.ts, 3, 1))
+
+    db: db.db;
+>db : Symbol(db, Decl(service.ts, 5, 15))
+>db : Symbol(db, Decl(service.ts, 0, 0))
+>db : Symbol(db.db, Decl(db.ts, 0, 0))
+
+    constructor(db: db.db) { // collision with namespace of external module db
+>db : Symbol(db, Decl(service.ts, 8, 16))
+>db : Symbol(db, Decl(service.ts, 0, 0))
+>db : Symbol(db.db, Decl(db.ts, 0, 0))
+
+        this.db = db;
+>this.db : Symbol(db, Decl(service.ts, 5, 15))
+>this : Symbol(MyClass, Decl(service.ts, 3, 1))
+>db : Symbol(db, Decl(service.ts, 5, 15))
+>db : Symbol(db, Decl(service.ts, 8, 16))
+
+        this.db.doSomething();
+>this.db.doSomething : Symbol(db.db.doSomething, Decl(db.ts, 0, 17))
+>this.db : Symbol(db, Decl(service.ts, 5, 15))
+>this : Symbol(MyClass, Decl(service.ts, 3, 1))
+>db : Symbol(db, Decl(service.ts, 5, 15))
+>doSomething : Symbol(db.db.doSomething, Decl(db.ts, 0, 17))
+    }
+}
+export {MyClass};
+>MyClass : Symbol(MyClass, Decl(service.ts, 13, 8))
+
+=== tests/cases/compiler/db.ts ===
+export class db {
+>db : Symbol(db, Decl(db.ts, 0, 0))
+
+    public doSomething() {
+>doSomething : Symbol(doSomething, Decl(db.ts, 0, 17))
+    }
+}
+
diff --git a/tests/baselines/reference/decoratorMetadataWithImportDeclarationNameCollision3.types b/tests/baselines/reference/decoratorMetadataWithImportDeclarationNameCollision3.types
new file mode 100644
index 00000000000..0eea3e13b66
--- /dev/null
+++ b/tests/baselines/reference/decoratorMetadataWithImportDeclarationNameCollision3.types
@@ -0,0 +1,55 @@
+=== tests/cases/compiler/service.ts ===
+import db = require('./db');
+>db : typeof db
+
+function someDecorator(target) {
+>someDecorator : (target: any) => any
+>target : any
+
+    return target;
+>target : any
+}
+@someDecorator
+>someDecorator : (target: any) => any
+
+class MyClass {
+>MyClass : MyClass
+
+    db: db.db;
+>db : db.db
+>db : any
+>db : db.db
+
+    constructor(db: db.db) { // collision with namespace of external module db
+>db : db.db
+>db : any
+>db : db.db
+
+        this.db = db;
+>this.db = db : db.db
+>this.db : db.db
+>this : MyClass
+>db : db.db
+>db : db.db
+
+        this.db.doSomething();
+>this.db.doSomething() : void
+>this.db.doSomething : () => void
+>this.db : db.db
+>this : MyClass
+>db : db.db
+>doSomething : () => void
+    }
+}
+export {MyClass};
+>MyClass : typeof MyClass
+
+=== tests/cases/compiler/db.ts ===
+export class db {
+>db : db
+
+    public doSomething() {
+>doSomething : () => void
+    }
+}
+
diff --git a/tests/baselines/reference/decoratorMetadataWithImportDeclarationNameCollision8.js b/tests/baselines/reference/decoratorMetadataWithImportDeclarationNameCollision8.js
new file mode 100644
index 00000000000..0aee9e471dd
--- /dev/null
+++ b/tests/baselines/reference/decoratorMetadataWithImportDeclarationNameCollision8.js
@@ -0,0 +1,51 @@
+//// [tests/cases/compiler/decoratorMetadataWithImportDeclarationNameCollision8.ts] ////
+
+//// [db.ts]
+export class db {
+    public doSomething() {
+    }
+}
+
+//// [service.ts]
+import database = require('./db');
+function someDecorator(target) {
+    return target;
+}
+@someDecorator
+class MyClass {
+    db: database.db;
+
+    constructor(db: database.db) { // no collision
+        this.db = db;
+        this.db.doSomething();
+    }
+}
+export {MyClass};
+
+
+//// [db.js]
+var db = (function () {
+    function db() {
+    }
+    db.prototype.doSomething = function () {
+    };
+    return db;
+})();
+exports.db = db;
+//// [service.js]
+var database = require('./db');
+function someDecorator(target) {
+    return target;
+}
+var MyClass = (function () {
+    function MyClass(db) {
+        this.db = db;
+        this.db.doSomething();
+    }
+    MyClass = __decorate([
+        someDecorator, 
+        __metadata('design:paramtypes', [database.db])
+    ], MyClass);
+    return MyClass;
+})();
+exports.MyClass = MyClass;
diff --git a/tests/baselines/reference/decoratorMetadataWithImportDeclarationNameCollision8.symbols b/tests/baselines/reference/decoratorMetadataWithImportDeclarationNameCollision8.symbols
new file mode 100644
index 00000000000..1b73ea2e9a3
--- /dev/null
+++ b/tests/baselines/reference/decoratorMetadataWithImportDeclarationNameCollision8.symbols
@@ -0,0 +1,53 @@
+=== tests/cases/compiler/service.ts ===
+import database = require('./db');
+>database : Symbol(database, Decl(service.ts, 0, 0))
+
+function someDecorator(target) {
+>someDecorator : Symbol(someDecorator, Decl(service.ts, 0, 34))
+>target : Symbol(target, Decl(service.ts, 1, 23))
+
+    return target;
+>target : Symbol(target, Decl(service.ts, 1, 23))
+}
+@someDecorator
+>someDecorator : Symbol(someDecorator, Decl(service.ts, 0, 34))
+
+class MyClass {
+>MyClass : Symbol(MyClass, Decl(service.ts, 3, 1))
+
+    db: database.db;
+>db : Symbol(db, Decl(service.ts, 5, 15))
+>database : Symbol(database, Decl(service.ts, 0, 0))
+>db : Symbol(database.db, Decl(db.ts, 0, 0))
+
+    constructor(db: database.db) { // no collision
+>db : Symbol(db, Decl(service.ts, 8, 16))
+>database : Symbol(database, Decl(service.ts, 0, 0))
+>db : Symbol(database.db, Decl(db.ts, 0, 0))
+
+        this.db = db;
+>this.db : Symbol(db, Decl(service.ts, 5, 15))
+>this : Symbol(MyClass, Decl(service.ts, 3, 1))
+>db : Symbol(db, Decl(service.ts, 5, 15))
+>db : Symbol(db, Decl(service.ts, 8, 16))
+
+        this.db.doSomething();
+>this.db.doSomething : Symbol(database.db.doSomething, Decl(db.ts, 0, 17))
+>this.db : Symbol(db, Decl(service.ts, 5, 15))
+>this : Symbol(MyClass, Decl(service.ts, 3, 1))
+>db : Symbol(db, Decl(service.ts, 5, 15))
+>doSomething : Symbol(database.db.doSomething, Decl(db.ts, 0, 17))
+    }
+}
+export {MyClass};
+>MyClass : Symbol(MyClass, Decl(service.ts, 13, 8))
+
+=== tests/cases/compiler/db.ts ===
+export class db {
+>db : Symbol(db, Decl(db.ts, 0, 0))
+
+    public doSomething() {
+>doSomething : Symbol(doSomething, Decl(db.ts, 0, 17))
+    }
+}
+
diff --git a/tests/baselines/reference/decoratorMetadataWithImportDeclarationNameCollision8.types b/tests/baselines/reference/decoratorMetadataWithImportDeclarationNameCollision8.types
new file mode 100644
index 00000000000..faaab056885
--- /dev/null
+++ b/tests/baselines/reference/decoratorMetadataWithImportDeclarationNameCollision8.types
@@ -0,0 +1,55 @@
+=== tests/cases/compiler/service.ts ===
+import database = require('./db');
+>database : typeof database
+
+function someDecorator(target) {
+>someDecorator : (target: any) => any
+>target : any
+
+    return target;
+>target : any
+}
+@someDecorator
+>someDecorator : (target: any) => any
+
+class MyClass {
+>MyClass : MyClass
+
+    db: database.db;
+>db : database.db
+>database : any
+>db : database.db
+
+    constructor(db: database.db) { // no collision
+>db : database.db
+>database : any
+>db : database.db
+
+        this.db = db;
+>this.db = db : database.db
+>this.db : database.db
+>this : MyClass
+>db : database.db
+>db : database.db
+
+        this.db.doSomething();
+>this.db.doSomething() : void
+>this.db.doSomething : () => void
+>this.db : database.db
+>this : MyClass
+>db : database.db
+>doSomething : () => void
+    }
+}
+export {MyClass};
+>MyClass : typeof MyClass
+
+=== tests/cases/compiler/db.ts ===
+export class db {
+>db : db
+
+    public doSomething() {
+>doSomething : () => void
+    }
+}
+
diff --git a/tests/cases/compiler/decoratorMetadataWithImportDeclarationNameCollision3.ts b/tests/cases/compiler/decoratorMetadataWithImportDeclarationNameCollision3.ts
new file mode 100644
index 00000000000..e15570cb5ba
--- /dev/null
+++ b/tests/cases/compiler/decoratorMetadataWithImportDeclarationNameCollision3.ts
@@ -0,0 +1,26 @@
+// @noemithelpers: true
+// @experimentaldecorators: true
+// @emitdecoratormetadata: true
+// @target: es5
+// @module: commonjs
+// @filename: db.ts
+export class db {
+    public doSomething() {
+    }
+}
+
+// @filename: service.ts
+import db = require('./db');
+function someDecorator(target) {
+    return target;
+}
+@someDecorator
+class MyClass {
+    db: db.db;
+
+    constructor(db: db.db) { // collision with namespace of external module db
+        this.db = db;
+        this.db.doSomething();
+    }
+}
+export {MyClass};
diff --git a/tests/cases/compiler/decoratorMetadataWithImportDeclarationNameCollision8.ts b/tests/cases/compiler/decoratorMetadataWithImportDeclarationNameCollision8.ts
new file mode 100644
index 00000000000..e3318d813a8
--- /dev/null
+++ b/tests/cases/compiler/decoratorMetadataWithImportDeclarationNameCollision8.ts
@@ -0,0 +1,26 @@
+// @noemithelpers: true
+// @experimentaldecorators: true
+// @emitdecoratormetadata: true
+// @target: es5
+// @module: commonjs
+// @filename: db.ts
+export class db {
+    public doSomething() {
+    }
+}
+
+// @filename: service.ts
+import database = require('./db');
+function someDecorator(target) {
+    return target;
+}
+@someDecorator
+class MyClass {
+    db: database.db;
+
+    constructor(db: database.db) { // no collision
+        this.db = db;
+        this.db.doSomething();
+    }
+}
+export {MyClass};