diff --git a/tests/baselines/reference/destructuringParameterDeclaration.errors.txt b/tests/baselines/reference/destructuringParameterDeclaration.errors.txt
new file mode 100644
index 00000000000..643305a0167
--- /dev/null
+++ b/tests/baselines/reference/destructuringParameterDeclaration.errors.txt
@@ -0,0 +1,37 @@
+tests/cases/conformance/es6/destructuring/destructuringParameterDeclaration.ts(17,1): error TS2346: Supplied parameters do not match any signature of call target.
+tests/cases/conformance/es6/destructuring/destructuringParameterDeclaration.ts(18,4): error TS2345: Argument of type '{}' is not assignable to parameter of type '{ z: number; }'.
+  Property 'z' is missing in type '{}'.
+tests/cases/conformance/es6/destructuring/destructuringParameterDeclaration.ts(19,14): error TS2300: Duplicate identifier 'z'.
+tests/cases/conformance/es6/destructuring/destructuringParameterDeclaration.ts(19,18): error TS2300: Duplicate identifier 'z'.
+
+
+==== tests/cases/conformance/es6/destructuring/destructuringParameterDeclaration.ts (4 errors) ====
+    enum Foo { a }
+    function a({x, a}: { x: number, a: number }) { }
+    function a1({z: {x, y: {j}}}) { }
+    function a2({z: {x, y: {j}}} = { z: { x: "hi", y: { j: 1 } } }) { }
+    function a3({z} = {z:10}) { }
+    function a4({z=10}) { }
+    function a6({b}: { b: number|string|boolean } = { b: "hello" }) { }
+    a2();
+    a2({ z: { x: "hello" , y: { j: Foo.a } }});
+    a3();
+    a3({ z: Foo.a });
+    a4({});
+    a6({ b: 10 });
+    a6({ b: true });
+    
+    // error
+    a4();
+    ~~~~
+!!! error TS2346: Supplied parameters do not match any signature of call target.
+    a3({});
+       ~~
+!!! error TS2345: Argument of type '{}' is not assignable to parameter of type '{ z: number; }'.
+!!! error TS2345:   Property 'z' is missing in type '{}'.
+    function a5([z], z: number) { }
+                 ~
+!!! error TS2300: Duplicate identifier 'z'.
+                     ~
+!!! error TS2300: Duplicate identifier 'z'.
+    
\ No newline at end of file
diff --git a/tests/baselines/reference/destructuringParameterDeclaration.js b/tests/baselines/reference/destructuringParameterDeclaration.js
new file mode 100644
index 00000000000..da979430ff3
--- /dev/null
+++ b/tests/baselines/reference/destructuringParameterDeclaration.js
@@ -0,0 +1,58 @@
+//// [destructuringParameterDeclaration.ts]
+enum Foo { a }
+function a({x, a}: { x: number, a: number }) { }
+function a1({z: {x, y: {j}}}) { }
+function a2({z: {x, y: {j}}} = { z: { x: "hi", y: { j: 1 } } }) { }
+function a3({z} = {z:10}) { }
+function a4({z=10}) { }
+function a6({b}: { b: number|string|boolean } = { b: "hello" }) { }
+a2();
+a2({ z: { x: "hello" , y: { j: Foo.a } }});
+a3();
+a3({ z: Foo.a });
+a4({});
+a6({ b: 10 });
+a6({ b: true });
+
+// error
+a4();
+a3({});
+function a5([z], z: number) { }
+
+
+//// [destructuringParameterDeclaration.js]
+var Foo;
+(function (Foo) {
+    Foo[Foo["a"] = 0] = "a";
+})(Foo || (Foo = {}));
+function a(_a) {
+    var x = _a.x, a = _a.a;
+}
+function a1(_a) {
+    var _b = _a.z, x = _b.x, j = _b.y.j;
+}
+function a2(_a) {
+    var _b = (_a === void 0 ? { z: { x: "hi", y: { j: 1 } } } : _a).z, x = _b.x, j = _b.y.j;
+}
+function a3(_a) {
+    var z = (_a === void 0 ? { z: 10 } : _a).z;
+}
+function a4(_a) {
+    var _b = _a.z, z = _b === void 0 ? 10 : _b;
+}
+function a6(_a) {
+    var b = (_a === void 0 ? { b: "hello" } : _a).b;
+}
+a2();
+a2({ z: { x: "hello", y: { j: Foo.a } } });
+a3();
+a3({ z: Foo.a });
+a4({});
+a6({ b: 10 });
+a6({ b: true });
+// error
+a4();
+a3({});
+function a5(_a, z) {
+    var z = _a[0];
+}
diff --git a/tests/baselines/reference/destructuringParameterDeclaration1.errors.txt b/tests/baselines/reference/destructuringParameterDeclaration1.errors.txt
new file mode 100644
index 00000000000..2651be05038
--- /dev/null
+++ b/tests/baselines/reference/destructuringParameterDeclaration1.errors.txt
@@ -0,0 +1,48 @@
+tests/cases/conformance/es6/destructuring/destructuringParameterDeclaration1.ts(5,16): error TS1048: A rest parameter cannot have an initializer.
+tests/cases/conformance/es6/destructuring/destructuringParameterDeclaration1.ts(11,13): error TS2370: A rest parameter must be of an array type.
+tests/cases/conformance/es6/destructuring/destructuringParameterDeclaration1.ts(12,18): error TS1047: A rest parameter cannot be optional.
+tests/cases/conformance/es6/destructuring/destructuringParameterDeclaration1.ts(13,17): error TS1048: A rest parameter cannot have an initializer.
+tests/cases/conformance/es6/destructuring/destructuringParameterDeclaration1.ts(16,19): error TS2345: Argument of type 'boolean' is not assignable to parameter of type 'string | number'.
+  Type 'boolean' is not assignable to type 'number'.
+tests/cases/conformance/es6/destructuring/destructuringParameterDeclaration1.ts(21,4): error TS2345: Argument of type 'string | boolean' is not assignable to parameter of type 'string | number'.
+  Type 'boolean' is not assignable to type 'string | number'.
+    Type 'boolean' is not assignable to type 'number'.
+
+
+==== tests/cases/conformance/es6/destructuring/destructuringParameterDeclaration1.ts (6 errors) ====
+    type arrayString = Array<String>
+    type someArray = Array<String> | number[];
+    type stringOrNumArray = Array<String|Number>;
+    
+    function a3(...x = [1,2,3]) { }
+                   ~
+!!! error TS1048: A rest parameter cannot have an initializer.
+    function a4(...x: (number|string)[]) { }
+    function a5(...a) { }
+    function a6(...a: Array<String>) { }
+    function a7(...a: arrayString) { }
+    function a8(...a: stringOrNumArray) { }
+    function a9(...a: someArray) { }
+                ~~~~~~~~~~~~~~~
+!!! error TS2370: A rest parameter must be of an array type.
+    function a10(...b?) { }
+                     ~
+!!! error TS1047: A rest parameter cannot be optional.
+    function a11(...b = [1,2,3]) { }
+                    ~
+!!! error TS1048: A rest parameter cannot have an initializer.
+    
+    
+    a4(1, 2, "hello", true);
+                      ~~~~
+!!! error TS2345: Argument of type 'boolean' is not assignable to parameter of type 'string | number'.
+!!! error TS2345:   Type 'boolean' is not assignable to type 'number'.
+    var array = [1, 2, 3];
+    var array2 = [true, false, "hello"];
+    a5([...array]);
+    a4(...array);
+    a4(...array2);
+       ~~~~~~~~~
+!!! error TS2345: Argument of type 'string | boolean' is not assignable to parameter of type 'string | number'.
+!!! error TS2345:   Type 'boolean' is not assignable to type 'string | number'.
+!!! error TS2345:     Type 'boolean' is not assignable to type 'number'.
\ No newline at end of file
diff --git a/tests/baselines/reference/destructuringParameterDeclaration1.js b/tests/baselines/reference/destructuringParameterDeclaration1.js
new file mode 100644
index 00000000000..37967ddb441
--- /dev/null
+++ b/tests/baselines/reference/destructuringParameterDeclaration1.js
@@ -0,0 +1,86 @@
+//// [destructuringParameterDeclaration1.ts]
+type arrayString = Array<String>
+type someArray = Array<String> | number[];
+type stringOrNumArray = Array<String|Number>;
+
+function a3(...x = [1,2,3]) { }
+function a4(...x: (number|string)[]) { }
+function a5(...a) { }
+function a6(...a: Array<String>) { }
+function a7(...a: arrayString) { }
+function a8(...a: stringOrNumArray) { }
+function a9(...a: someArray) { }
+function a10(...b?) { }
+function a11(...b = [1,2,3]) { }
+
+
+a4(1, 2, "hello", true);
+var array = [1, 2, 3];
+var array2 = [true, false, "hello"];
+a5([...array]);
+a4(...array);
+a4(...array2);
+
+//// [destructuringParameterDeclaration1.js]
+function a3() {
+    if (x === void 0) { x = [1, 2, 3]; }
+    var x = [];
+    for (var _i = 0; _i < arguments.length; _i++) {
+        x[_i - 0] = arguments[_i];
+    }
+}
+function a4() {
+    var x = [];
+    for (var _i = 0; _i < arguments.length; _i++) {
+        x[_i - 0] = arguments[_i];
+    }
+}
+function a5() {
+    var a = [];
+    for (var _i = 0; _i < arguments.length; _i++) {
+        a[_i - 0] = arguments[_i];
+    }
+}
+function a6() {
+    var a = [];
+    for (var _i = 0; _i < arguments.length; _i++) {
+        a[_i - 0] = arguments[_i];
+    }
+}
+function a7() {
+    var a = [];
+    for (var _i = 0; _i < arguments.length; _i++) {
+        a[_i - 0] = arguments[_i];
+    }
+}
+function a8() {
+    var a = [];
+    for (var _i = 0; _i < arguments.length; _i++) {
+        a[_i - 0] = arguments[_i];
+    }
+}
+function a9() {
+    var a = [];
+    for (var _i = 0; _i < arguments.length; _i++) {
+        a[_i - 0] = arguments[_i];
+    }
+}
+function a10() {
+    var b = [];
+    for (var _i = 0; _i < arguments.length; _i++) {
+        b[_i - 0] = arguments[_i];
+    }
+}
+function a11() {
+    if (b === void 0) { b = [1, 2, 3]; }
+    var b = [];
+    for (var _i = 0; _i < arguments.length; _i++) {
+        b[_i - 0] = arguments[_i];
+    }
+}
+a4(1, 2, "hello", true);
+var array = [1, 2, 3];
+var array2 = [true, false, "hello"];
+a5(array);
+a4.apply(void 0, array);
+a4.apply(void 0, array2);
diff --git a/tests/baselines/reference/destructuringParameterDeclaration1ES6.errors.txt b/tests/baselines/reference/destructuringParameterDeclaration1ES6.errors.txt
new file mode 100644
index 00000000000..786571c88a5
--- /dev/null
+++ b/tests/baselines/reference/destructuringParameterDeclaration1ES6.errors.txt
@@ -0,0 +1,48 @@
+tests/cases/conformance/es6/destructuring/destructuringParameterDeclaration1ES6.ts(5,16): error TS1048: A rest parameter cannot have an initializer.
+tests/cases/conformance/es6/destructuring/destructuringParameterDeclaration1ES6.ts(11,13): error TS2370: A rest parameter must be of an array type.
+tests/cases/conformance/es6/destructuring/destructuringParameterDeclaration1ES6.ts(12,18): error TS1047: A rest parameter cannot be optional.
+tests/cases/conformance/es6/destructuring/destructuringParameterDeclaration1ES6.ts(13,17): error TS1048: A rest parameter cannot have an initializer.
+tests/cases/conformance/es6/destructuring/destructuringParameterDeclaration1ES6.ts(16,19): error TS2345: Argument of type 'boolean' is not assignable to parameter of type 'string | number'.
+  Type 'boolean' is not assignable to type 'number'.
+tests/cases/conformance/es6/destructuring/destructuringParameterDeclaration1ES6.ts(21,4): error TS2345: Argument of type 'string | boolean' is not assignable to parameter of type 'string | number'.
+  Type 'boolean' is not assignable to type 'string | number'.
+    Type 'boolean' is not assignable to type 'number'.
+
+
+==== tests/cases/conformance/es6/destructuring/destructuringParameterDeclaration1ES6.ts (6 errors) ====
+    type arrayString = Array<String>
+    type someArray = Array<String> | number[];
+    type stringOrNumArray = Array<String|Number>;
+    
+    function a3(...x = [1,2,3]) { }
+                   ~
+!!! error TS1048: A rest parameter cannot have an initializer.
+    function a4(...x: (number|string)[]) { }
+    function a5(...a) { }
+    function a6(...a: Array<String>) { }
+    function a7(...a: arrayString) { }
+    function a8(...a: stringOrNumArray) { }
+    function a9(...a: someArray) { }
+                ~~~~~~~~~~~~~~~
+!!! error TS2370: A rest parameter must be of an array type.
+    function a10(...b?) { }
+                     ~
+!!! error TS1047: A rest parameter cannot be optional.
+    function a11(...b = [1,2,3]) { }
+                    ~
+!!! error TS1048: A rest parameter cannot have an initializer.
+    
+    
+    a4(1, 2, "hello", true);
+                      ~~~~
+!!! error TS2345: Argument of type 'boolean' is not assignable to parameter of type 'string | number'.
+!!! error TS2345:   Type 'boolean' is not assignable to type 'number'.
+    var array = [1, 2, 3];
+    var array2 = [true, false, "hello"];
+    a5([...array]);
+    a4(...array);
+    a4(...array2);
+       ~~~~~~~~~
+!!! error TS2345: Argument of type 'string | boolean' is not assignable to parameter of type 'string | number'.
+!!! error TS2345:   Type 'boolean' is not assignable to type 'string | number'.
+!!! error TS2345:     Type 'boolean' is not assignable to type 'number'.
\ No newline at end of file
diff --git a/tests/baselines/reference/destructuringParameterDeclaration1ES6.js b/tests/baselines/reference/destructuringParameterDeclaration1ES6.js
new file mode 100644
index 00000000000..779f5495f56
--- /dev/null
+++ b/tests/baselines/reference/destructuringParameterDeclaration1ES6.js
@@ -0,0 +1,39 @@
+//// [destructuringParameterDeclaration1ES6.ts]
+type arrayString = Array<String>
+type someArray = Array<String> | number[];
+type stringOrNumArray = Array<String|Number>;
+
+function a3(...x = [1,2,3]) { }
+function a4(...x: (number|string)[]) { }
+function a5(...a) { }
+function a6(...a: Array<String>) { }
+function a7(...a: arrayString) { }
+function a8(...a: stringOrNumArray) { }
+function a9(...a: someArray) { }
+function a10(...b?) { }
+function a11(...b = [1,2,3]) { }
+
+
+a4(1, 2, "hello", true);
+var array = [1, 2, 3];
+var array2 = [true, false, "hello"];
+a5([...array]);
+a4(...array);
+a4(...array2);
+
+//// [destructuringParameterDeclaration1ES6.js]
+function a3(...x = [1, 2, 3]) { }
+function a4(...x) { }
+function a5(...a) { }
+function a6(...a) { }
+function a7(...a) { }
+function a8(...a) { }
+function a9(...a) { }
+function a10(...b) { }
+function a11(...b = [1, 2, 3]) { }
+a4(1, 2, "hello", true);
+var array = [1, 2, 3];
+var array2 = [true, false, "hello"];
+a5([...array]);
+a4(...array);
+a4(...array2);
diff --git a/tests/baselines/reference/destructuringParameterDeclaration2.errors.txt b/tests/baselines/reference/destructuringParameterDeclaration2.errors.txt
new file mode 100644
index 00000000000..afe984cc031
--- /dev/null
+++ b/tests/baselines/reference/destructuringParameterDeclaration2.errors.txt
@@ -0,0 +1,56 @@
+tests/cases/conformance/es6/destructuring/destructuringParameterDeclaration2.ts(6,14): error TS1181: Array element destructuring pattern expected.
+tests/cases/conformance/es6/destructuring/destructuringParameterDeclaration2.ts(6,19): error TS1005: '(' expected.
+tests/cases/conformance/es6/destructuring/destructuringParameterDeclaration2.ts(6,21): error TS1109: Expression expected.
+tests/cases/conformance/es6/destructuring/destructuringParameterDeclaration2.ts(6,24): error TS1005: '(' expected.
+tests/cases/conformance/es6/destructuring/destructuringParameterDeclaration2.ts(6,26): error TS2304: Cannot find name 'public'.
+tests/cases/conformance/es6/destructuring/destructuringParameterDeclaration2.ts(6,32): error TS1005: ';' expected.
+tests/cases/conformance/es6/destructuring/destructuringParameterDeclaration2.ts(6,33): error TS1128: Declaration or statement expected.
+tests/cases/conformance/es6/destructuring/destructuringParameterDeclaration2.ts(7,16): error TS1003: Identifier expected.
+tests/cases/conformance/es6/destructuring/destructuringParameterDeclaration2.ts(7,21): error TS1005: '(' expected.
+tests/cases/conformance/es6/destructuring/destructuringParameterDeclaration2.ts(9,13): error TS2370: A rest parameter must be of an array type.
+tests/cases/conformance/es6/destructuring/destructuringParameterDeclaration2.ts(12,24): error TS1005: ',' expected.
+
+
+==== tests/cases/conformance/es6/destructuring/destructuringParameterDeclaration2.ts (11 errors) ====
+    "use strict"
+    function a({while}) { }
+    function a1({public}) { }
+    function a2({public: x}) { }
+    function a3({while: y}) { }
+    function a4([while, for, public]){ }
+                 ~~~~~
+!!! error TS1181: Array element destructuring pattern expected.
+                      ~
+!!! error TS1005: '(' expected.
+                        ~~~
+!!! error TS1109: Expression expected.
+                           ~
+!!! error TS1005: '(' expected.
+                             ~~~~~~
+!!! error TS2304: Cannot find name 'public'.
+                                   ~
+!!! error TS1005: ';' expected.
+                                    ~
+!!! error TS1128: Declaration or statement expected.
+    function a5(...while) { }
+                   ~~~~~
+!!! error TS1003: Identifier expected.
+                        ~
+!!! error TS1005: '(' expected.
+    function a6(...public) { }
+    function a7(...a: string) { }
+                ~~~~~~~~~~~~
+!!! error TS2370: A rest parameter must be of an array type.
+    
+    class C {
+        constructor(public ...a) { }
+                           ~~~
+!!! error TS1005: ',' expected.
+    }
+    
+    
+    a2({ public: 1 });
+    a3({ while: 1 });
+    a({ while: 1 });
+    
+    
\ No newline at end of file
diff --git a/tests/baselines/reference/destructuringParameterDeclaration2.js b/tests/baselines/reference/destructuringParameterDeclaration2.js
new file mode 100644
index 00000000000..ba6d7548442
--- /dev/null
+++ b/tests/baselines/reference/destructuringParameterDeclaration2.js
@@ -0,0 +1,65 @@
+//// [destructuringParameterDeclaration2.ts]
+"use strict"
+function a({while}) { }
+function a1({public}) { }
+function a2({public: x}) { }
+function a3({while: y}) { }
+function a4([while, for, public]){ }
+function a5(...while) { }
+function a6(...public) { }
+function a7(...a: string) { }
+
+class C {
+    constructor(public ...a) { }
+}
+
+
+a2({ public: 1 });
+a3({ while: 1 });
+a({ while: 1 });
+
+
+
+//// [destructuringParameterDeclaration2.js]
+"use strict";
+function a(_a) {
+    var while = _a.while;
+}
+function a1(_a) {
+    var public = _a.public;
+}
+function a2(_a) {
+    var x = _a.public;
+}
+function a3(_a) {
+    var y = _a.while;
+}
+while (, )
+    for (, public; ; )
+        ;
+{ }
+while () { }
+function a6() {
+    var public = [];
+    for (var _i = 0; _i < arguments.length; _i++) {
+        public[_i - 0] = arguments[_i];
+    }
+}
+function a7() {
+    var a = [];
+    for (var _i = 0; _i < arguments.length; _i++) {
+        a[_i - 0] = arguments[_i];
+    }
+}
+var C = (function () {
+    function C(public) {
+        var a = [];
+        for (var _i = 1; _i < arguments.length; _i++) {
+            a[_i - 1] = arguments[_i];
+        }
+    }
+    return C;
+})();
+a2({ public: 1 });
+a3({ while: 1 });
+a({ while: 1 });
diff --git a/tests/baselines/reference/destructuringParameterDeclaration2ES6.errors.txt b/tests/baselines/reference/destructuringParameterDeclaration2ES6.errors.txt
new file mode 100644
index 00000000000..762a0e1dd8a
--- /dev/null
+++ b/tests/baselines/reference/destructuringParameterDeclaration2ES6.errors.txt
@@ -0,0 +1,56 @@
+tests/cases/conformance/es6/destructuring/destructuringParameterDeclaration2ES6.ts(6,14): error TS1181: Array element destructuring pattern expected.
+tests/cases/conformance/es6/destructuring/destructuringParameterDeclaration2ES6.ts(6,19): error TS1005: '(' expected.
+tests/cases/conformance/es6/destructuring/destructuringParameterDeclaration2ES6.ts(6,21): error TS1109: Expression expected.
+tests/cases/conformance/es6/destructuring/destructuringParameterDeclaration2ES6.ts(6,24): error TS1005: '(' expected.
+tests/cases/conformance/es6/destructuring/destructuringParameterDeclaration2ES6.ts(6,26): error TS2304: Cannot find name 'public'.
+tests/cases/conformance/es6/destructuring/destructuringParameterDeclaration2ES6.ts(6,32): error TS1005: ';' expected.
+tests/cases/conformance/es6/destructuring/destructuringParameterDeclaration2ES6.ts(6,33): error TS1128: Declaration or statement expected.
+tests/cases/conformance/es6/destructuring/destructuringParameterDeclaration2ES6.ts(7,16): error TS1003: Identifier expected.
+tests/cases/conformance/es6/destructuring/destructuringParameterDeclaration2ES6.ts(7,21): error TS1005: '(' expected.
+tests/cases/conformance/es6/destructuring/destructuringParameterDeclaration2ES6.ts(9,13): error TS2370: A rest parameter must be of an array type.
+tests/cases/conformance/es6/destructuring/destructuringParameterDeclaration2ES6.ts(12,24): error TS1005: ',' expected.
+
+
+==== tests/cases/conformance/es6/destructuring/destructuringParameterDeclaration2ES6.ts (11 errors) ====
+    "use strict"
+    function a({while}) { }
+    function a1({public}) { }
+    function a2({public: x}) { }
+    function a3({while: y}) { }
+    function a4([while, for, public]){ }
+                 ~~~~~
+!!! error TS1181: Array element destructuring pattern expected.
+                      ~
+!!! error TS1005: '(' expected.
+                        ~~~
+!!! error TS1109: Expression expected.
+                           ~
+!!! error TS1005: '(' expected.
+                             ~~~~~~
+!!! error TS2304: Cannot find name 'public'.
+                                   ~
+!!! error TS1005: ';' expected.
+                                    ~
+!!! error TS1128: Declaration or statement expected.
+    function a5(...while) { }
+                   ~~~~~
+!!! error TS1003: Identifier expected.
+                        ~
+!!! error TS1005: '(' expected.
+    function a6(...public) { }
+    function a7(...a: string) { }
+                ~~~~~~~~~~~~
+!!! error TS2370: A rest parameter must be of an array type.
+    
+    class C {
+        constructor(public ...a) { }
+                           ~~~
+!!! error TS1005: ',' expected.
+    }
+    
+    
+    a2({ public: 1 });
+    a3({ while: 1 });
+    a({ while: 1 });
+    
+    
\ No newline at end of file
diff --git a/tests/baselines/reference/destructuringParameterDeclaration2ES6.js b/tests/baselines/reference/destructuringParameterDeclaration2ES6.js
new file mode 100644
index 00000000000..6e86aa2c001
--- /dev/null
+++ b/tests/baselines/reference/destructuringParameterDeclaration2ES6.js
@@ -0,0 +1,42 @@
+//// [destructuringParameterDeclaration2ES6.ts]
+"use strict"
+function a({while}) { }
+function a1({public}) { }
+function a2({public: x}) { }
+function a3({while: y}) { }
+function a4([while, for, public]){ }
+function a5(...while) { }
+function a6(...public) { }
+function a7(...a: string) { }
+
+class C {
+    constructor(public ...a) { }
+}
+
+
+a2({ public: 1 });
+a3({ while: 1 });
+a({ while: 1 });
+
+
+
+//// [destructuringParameterDeclaration2ES6.js]
+"use strict";
+function a({ while }) { }
+function a1({ public }) { }
+function a2({ public: x }) { }
+function a3({ while: y }) { }
+while (, )
+    for (, public; ; )
+        ;
+{ }
+while () { }
+function a6(...public) { }
+function a7(...a) { }
+class C {
+    constructor(public, ...a) {
+    }
+}
+a2({ public: 1 });
+a3({ while: 1 });
+a({ while: 1 });
diff --git a/tests/baselines/reference/destructuringParameterDeclaration3.js b/tests/baselines/reference/destructuringParameterDeclaration3.js
new file mode 100644
index 00000000000..82d1404881c
--- /dev/null
+++ b/tests/baselines/reference/destructuringParameterDeclaration3.js
@@ -0,0 +1,51 @@
+//// [destructuringParameterDeclaration3.ts]
+function a([x, [y, z], [[j]]]) {
+    return [x, y, z, j];
+}
+
+function a1([...x]) {
+    return [x];
+}
+
+function a2({public} = { "public": "1" }) {
+    return public;
+}
+
+function a3({x: { y, z}, j: {k: {a}} }) {
+    return [y, z, a];
+}
+
+function a4({x: { y, z}, j: {k: {a}} } = { x: { y: 1, z: 1 }, j: { k: { a: "hello" } } }): (number| string) [] {
+    return [y, z, a];
+}
+
+function a5({x: { y, z}, j: {k: {a}} }): (number| string) [] {
+    return [y, z, a];
+}
+
+
+//// [destructuringParameterDeclaration3.js]
+function a(_a) {
+    var x = _a[0], _b = _a[1], y = _b[0], z = _b[1], j = _a[2][0][0];
+    return [x, y, z, j];
+}
+function a1(_a) {
+    var x = _a.slice(0);
+    return [x];
+}
+function a2(_a) {
+    var public = (_a === void 0 ? { "public": "1" } : _a).public;
+    return public;
+}
+function a3(_a) {
+    var _b = _a.x, y = _b.y, z = _b.z, a = _a.j.k.a;
+    return [y, z, a];
+}
+function a4(_a) {
+    var _b = _a === void 0 ? { x: { y: 1, z: 1 }, j: { k: { a: "hello" } } } : _a, _c = _b.x, y = _c.y, z = _c.z, a = _b.j.k.a;
+    return [y, z, a];
+}
+function a5(_a) {
+    var _b = _a.x, y = _b.y, z = _b.z, a = _a.j.k.a;
+    return [y, z, a];
+}
diff --git a/tests/baselines/reference/destructuringParameterDeclaration3.types b/tests/baselines/reference/destructuringParameterDeclaration3.types
new file mode 100644
index 00000000000..41835d9e456
--- /dev/null
+++ b/tests/baselines/reference/destructuringParameterDeclaration3.types
@@ -0,0 +1,92 @@
+=== tests/cases/conformance/es6/destructuring/destructuringParameterDeclaration3.ts ===
+function a([x, [y, z], [[j]]]) {
+>a : ([x, [y, z], [[j]]]: [any, [any, any], [[any]]]) => any[]
+>x : any
+>y : any
+>z : any
+>j : any
+
+    return [x, y, z, j];
+>[x, y, z, j] : any[]
+>x : any
+>y : any
+>z : any
+>j : any
+}
+
+function a1([...x]) {
+>a1 : ([...x]: any[]) => any[][]
+>x : any[]
+
+    return [x];
+>[x] : any[][]
+>x : any[]
+}
+
+function a2({public} = { "public": "1" }) {
+>a2 : ({public}?: { "public": string; }) => string
+>public : string
+>{ "public": "1" } : { "public": string; }
+
+    return public;
+>public : string
+}
+
+function a3({x: { y, z}, j: {k: {a}} }) {
+>a3 : ({x: { y, z}, j: {k: {a}} }: { x: { y: any; z: any; }; j: { k: { a: any; }; }; }) => any[]
+>x : unknown
+>y : any
+>z : any
+>j : unknown
+>k : unknown
+>a : any
+
+    return [y, z, a];
+>[y, z, a] : any[]
+>y : any
+>z : any
+>a : any
+}
+
+function a4({x: { y, z}, j: {k: {a}} } = { x: { y: 1, z: 1 }, j: { k: { a: "hello" } } }): (number| string) [] {
+>a4 : ({x: { y, z}, j: {k: {a}} }?: { x: { y: number; z: number; }; j: { k: { a: string; }; }; }) => (string | number)[]
+>x : unknown
+>y : number
+>z : number
+>j : unknown
+>k : unknown
+>a : string
+>{ x: { y: 1, z: 1 }, j: { k: { a: "hello" } } } : { x: { y: number; z: number; }; j: { k: { a: string; }; }; }
+>x : { y: number; z: number; }
+>{ y: 1, z: 1 } : { y: number; z: number; }
+>y : number
+>z : number
+>j : { k: { a: string; }; }
+>{ k: { a: "hello" } } : { k: { a: string; }; }
+>k : { a: string; }
+>{ a: "hello" } : { a: string; }
+>a : string
+
+    return [y, z, a];
+>[y, z, a] : (string | number)[]
+>y : number
+>z : number
+>a : string
+}
+
+function a5({x: { y, z}, j: {k: {a}} }): (number| string) [] {
+>a5 : ({x: { y, z}, j: {k: {a}} }: { x: { y: any; z: any; }; j: { k: { a: any; }; }; }) => (string | number)[]
+>x : unknown
+>y : any
+>z : any
+>j : unknown
+>k : unknown
+>a : any
+
+    return [y, z, a];
+>[y, z, a] : any[]
+>y : any
+>z : any
+>a : any
+}
+
diff --git a/tests/baselines/reference/destructuringParameterDeclaration3ES6.js b/tests/baselines/reference/destructuringParameterDeclaration3ES6.js
new file mode 100644
index 00000000000..e129140f3f2
--- /dev/null
+++ b/tests/baselines/reference/destructuringParameterDeclaration3ES6.js
@@ -0,0 +1,45 @@
+//// [destructuringParameterDeclaration3ES6.ts]
+function a([x, [y, z], [[j]]]) {
+    return [x, y, z, j];
+}
+
+function a1([...x]) {
+    return [x];
+}
+
+function a2({public} = { "public": "1" }) {
+    return public;
+}
+
+function a3({x: { y, z}, j: {k: {a}} }) {
+    return [y, z, a];
+}
+
+function a4({x: { y, z}, j: {k: {a}} } = { x: { y: 1, z: 1 }, j: { k: { a: "hello" } } }): (number| string) [] {
+    return [y, z, a];
+}
+
+function a5({x: { y, z}, j: {k: {a}} }): (number| string) [] {
+    return [y, z, a];
+}
+
+
+//// [destructuringParameterDeclaration3ES6.js]
+function a([x, [y, z], [[j]]]) {
+    return [x, y, z, j];
+}
+function a1([...x]) {
+    return [x];
+}
+function a2({ public } = { "public": "1" }) {
+    return public;
+}
+function a3({ x: { y, z }, j: { k: { a } } }) {
+    return [y, z, a];
+}
+function a4({ x: { y, z }, j: { k: { a } } } = { x: { y: 1, z: 1 }, j: { k: { a: "hello" } } }) {
+    return [y, z, a];
+}
+function a5({ x: { y, z }, j: { k: { a } } }) {
+    return [y, z, a];
+}
diff --git a/tests/baselines/reference/destructuringParameterDeclaration3ES6.types b/tests/baselines/reference/destructuringParameterDeclaration3ES6.types
new file mode 100644
index 00000000000..01c67e1e547
--- /dev/null
+++ b/tests/baselines/reference/destructuringParameterDeclaration3ES6.types
@@ -0,0 +1,92 @@
+=== tests/cases/conformance/es6/destructuring/destructuringParameterDeclaration3ES6.ts ===
+function a([x, [y, z], [[j]]]) {
+>a : ([x, [y, z], [[j]]]: [any, [any, any], [[any]]]) => any[]
+>x : any
+>y : any
+>z : any
+>j : any
+
+    return [x, y, z, j];
+>[x, y, z, j] : any[]
+>x : any
+>y : any
+>z : any
+>j : any
+}
+
+function a1([...x]) {
+>a1 : ([...x]: Iterable<any>) => any[][]
+>x : any[]
+
+    return [x];
+>[x] : any[][]
+>x : any[]
+}
+
+function a2({public} = { "public": "1" }) {
+>a2 : ({public}?: { "public": string; }) => string
+>public : string
+>{ "public": "1" } : { "public": string; }
+
+    return public;
+>public : string
+}
+
+function a3({x: { y, z}, j: {k: {a}} }) {
+>a3 : ({x: { y, z}, j: {k: {a}} }: { x: { y: any; z: any; }; j: { k: { a: any; }; }; }) => any[]
+>x : unknown
+>y : any
+>z : any
+>j : unknown
+>k : unknown
+>a : any
+
+    return [y, z, a];
+>[y, z, a] : any[]
+>y : any
+>z : any
+>a : any
+}
+
+function a4({x: { y, z}, j: {k: {a}} } = { x: { y: 1, z: 1 }, j: { k: { a: "hello" } } }): (number| string) [] {
+>a4 : ({x: { y, z}, j: {k: {a}} }?: { x: { y: number; z: number; }; j: { k: { a: string; }; }; }) => (string | number)[]
+>x : unknown
+>y : number
+>z : number
+>j : unknown
+>k : unknown
+>a : string
+>{ x: { y: 1, z: 1 }, j: { k: { a: "hello" } } } : { x: { y: number; z: number; }; j: { k: { a: string; }; }; }
+>x : { y: number; z: number; }
+>{ y: 1, z: 1 } : { y: number; z: number; }
+>y : number
+>z : number
+>j : { k: { a: string; }; }
+>{ k: { a: "hello" } } : { k: { a: string; }; }
+>k : { a: string; }
+>{ a: "hello" } : { a: string; }
+>a : string
+
+    return [y, z, a];
+>[y, z, a] : (string | number)[]
+>y : number
+>z : number
+>a : string
+}
+
+function a5({x: { y, z}, j: {k: {a}} }): (number| string) [] {
+>a5 : ({x: { y, z}, j: {k: {a}} }: { x: { y: any; z: any; }; j: { k: { a: any; }; }; }) => (string | number)[]
+>x : unknown
+>y : any
+>z : any
+>j : unknown
+>k : unknown
+>a : any
+
+    return [y, z, a];
+>[y, z, a] : any[]
+>y : any
+>z : any
+>a : any
+}
+
diff --git a/tests/baselines/reference/destructuringParameterDeclarationES6.errors.txt b/tests/baselines/reference/destructuringParameterDeclarationES6.errors.txt
new file mode 100644
index 00000000000..21cd9f36c0f
--- /dev/null
+++ b/tests/baselines/reference/destructuringParameterDeclarationES6.errors.txt
@@ -0,0 +1,37 @@
+tests/cases/conformance/es6/destructuring/destructuringParameterDeclarationES6.ts(17,1): error TS2346: Supplied parameters do not match any signature of call target.
+tests/cases/conformance/es6/destructuring/destructuringParameterDeclarationES6.ts(18,4): error TS2345: Argument of type '{}' is not assignable to parameter of type '{ z: number; }'.
+  Property 'z' is missing in type '{}'.
+tests/cases/conformance/es6/destructuring/destructuringParameterDeclarationES6.ts(19,14): error TS2300: Duplicate identifier 'z'.
+tests/cases/conformance/es6/destructuring/destructuringParameterDeclarationES6.ts(19,18): error TS2300: Duplicate identifier 'z'.
+
+
+==== tests/cases/conformance/es6/destructuring/destructuringParameterDeclarationES6.ts (4 errors) ====
+    enum Foo { a }
+    function a({x, a}: { x: number, a: number }) { }
+    function a1({z: {x, y: {j}}}) { }
+    function a2({z: {x, y: {j}}} = { z: { x: "hi", y: { j: 1 } } }) { }
+    function a3({z} = {z:10}) { }
+    function a4({z=10}) { }
+    function a6({b}: { b: number|string|boolean } = { b: "hello" }) { }
+    a2();
+    a2({ z: { x: "hello" , y: { j: Foo.a } }});
+    a3();
+    a3({ z: Foo.a });
+    a4({});
+    a6({ b: 10 });
+    a6({ b: true });
+    
+    // error
+    a4();
+    ~~~~
+!!! error TS2346: Supplied parameters do not match any signature of call target.
+    a3({});
+       ~~
+!!! error TS2345: Argument of type '{}' is not assignable to parameter of type '{ z: number; }'.
+!!! error TS2345:   Property 'z' is missing in type '{}'.
+    function a5([z], z: number) { }
+                 ~
+!!! error TS2300: Duplicate identifier 'z'.
+                     ~
+!!! error TS2300: Duplicate identifier 'z'.
+    
\ No newline at end of file
diff --git a/tests/baselines/reference/destructuringParameterDeclarationES6.js b/tests/baselines/reference/destructuringParameterDeclarationES6.js
new file mode 100644
index 00000000000..7a4c929003d
--- /dev/null
+++ b/tests/baselines/reference/destructuringParameterDeclarationES6.js
@@ -0,0 +1,44 @@
+//// [destructuringParameterDeclarationES6.ts]
+enum Foo { a }
+function a({x, a}: { x: number, a: number }) { }
+function a1({z: {x, y: {j}}}) { }
+function a2({z: {x, y: {j}}} = { z: { x: "hi", y: { j: 1 } } }) { }
+function a3({z} = {z:10}) { }
+function a4({z=10}) { }
+function a6({b}: { b: number|string|boolean } = { b: "hello" }) { }
+a2();
+a2({ z: { x: "hello" , y: { j: Foo.a } }});
+a3();
+a3({ z: Foo.a });
+a4({});
+a6({ b: 10 });
+a6({ b: true });
+
+// error
+a4();
+a3({});
+function a5([z], z: number) { }
+
+
+//// [destructuringParameterDeclarationES6.js]
+var Foo;
+(function (Foo) {
+    Foo[Foo["a"] = 0] = "a";
+})(Foo || (Foo = {}));
+function a({ x, a }) { }
+function a1({ z: { x, y: { j } } }) { }
+function a2({ z: { x, y: { j } } } = { z: { x: "hi", y: { j: 1 } } }) { }
+function a3({ z } = { z: 10 }) { }
+function a4({ z = 10 }) { }
+function a6({ b } = { b: "hello" }) { }
+a2();
+a2({ z: { x: "hello", y: { j: Foo.a } } });
+a3();
+a3({ z: Foo.a });
+a4({});
+a6({ b: 10 });
+a6({ b: true });
+// error
+a4();
+a3({});
+function a5([z], z) { }
diff --git a/tests/cases/conformance/es6/destructuring/destructuringParameterDeclaration.ts b/tests/cases/conformance/es6/destructuring/destructuringParameterDeclaration.ts
new file mode 100644
index 00000000000..c840dba2d2b
--- /dev/null
+++ b/tests/cases/conformance/es6/destructuring/destructuringParameterDeclaration.ts
@@ -0,0 +1,19 @@
+enum Foo { a }
+function a({x, a}: { x: number, a: number }) { }
+function a1({z: {x, y: {j}}}) { }
+function a2({z: {x, y: {j}}} = { z: { x: "hi", y: { j: 1 } } }) { }
+function a3({z} = {z:10}) { }
+function a4({z=10}) { }
+function a6({b}: { b: number|string|boolean } = { b: "hello" }) { }
+a2();
+a2({ z: { x: "hello" , y: { j: Foo.a } }});
+a3();
+a3({ z: Foo.a });
+a4({});
+a6({ b: 10 });
+a6({ b: true });
+
+// error
+a4();
+a3({});
+function a5([z], z: number) { }
diff --git a/tests/cases/conformance/es6/destructuring/destructuringParameterDeclaration1.ts b/tests/cases/conformance/es6/destructuring/destructuringParameterDeclaration1.ts
new file mode 100644
index 00000000000..6e9579926dd
--- /dev/null
+++ b/tests/cases/conformance/es6/destructuring/destructuringParameterDeclaration1.ts
@@ -0,0 +1,21 @@
+type arrayString = Array<String>
+type someArray = Array<String> | number[];
+type stringOrNumArray = Array<String|Number>;
+
+function a3(...x = [1,2,3]) { }
+function a4(...x: (number|string)[]) { }
+function a5(...a) { }
+function a6(...a: Array<String>) { }
+function a7(...a: arrayString) { }
+function a8(...a: stringOrNumArray) { }
+function a9(...a: someArray) { }
+function a10(...b?) { }
+function a11(...b = [1,2,3]) { }
+
+
+a4(1, 2, "hello", true);
+var array = [1, 2, 3];
+var array2 = [true, false, "hello"];
+a5([...array]);
+a4(...array);
+a4(...array2);
\ No newline at end of file
diff --git a/tests/cases/conformance/es6/destructuring/destructuringParameterDeclaration1ES6.ts b/tests/cases/conformance/es6/destructuring/destructuringParameterDeclaration1ES6.ts
new file mode 100644
index 00000000000..1441226e061
--- /dev/null
+++ b/tests/cases/conformance/es6/destructuring/destructuringParameterDeclaration1ES6.ts
@@ -0,0 +1,22 @@
+// @target: es6
+type arrayString = Array<String>
+type someArray = Array<String> | number[];
+type stringOrNumArray = Array<String|Number>;
+
+function a3(...x = [1,2,3]) { }
+function a4(...x: (number|string)[]) { }
+function a5(...a) { }
+function a6(...a: Array<String>) { }
+function a7(...a: arrayString) { }
+function a8(...a: stringOrNumArray) { }
+function a9(...a: someArray) { }
+function a10(...b?) { }
+function a11(...b = [1,2,3]) { }
+
+
+a4(1, 2, "hello", true);
+var array = [1, 2, 3];
+var array2 = [true, false, "hello"];
+a5([...array]);
+a4(...array);
+a4(...array2);
\ No newline at end of file
diff --git a/tests/cases/conformance/es6/destructuring/destructuringParameterDeclaration2.ts b/tests/cases/conformance/es6/destructuring/destructuringParameterDeclaration2.ts
new file mode 100644
index 00000000000..59763c95902
--- /dev/null
+++ b/tests/cases/conformance/es6/destructuring/destructuringParameterDeclaration2.ts
@@ -0,0 +1,19 @@
+"use strict"
+function a({while}) { }
+function a1({public}) { }
+function a2({public: x}) { }
+function a3({while: y}) { }
+function a4([while, for, public]){ }
+function a5(...while) { }
+function a6(...public) { }
+function a7(...a: string) { }
+
+class C {
+    constructor(public ...a) { }
+}
+
+
+a2({ public: 1 });
+a3({ while: 1 });
+a({ while: 1 });
+
diff --git a/tests/cases/conformance/es6/destructuring/destructuringParameterDeclaration2ES6.ts b/tests/cases/conformance/es6/destructuring/destructuringParameterDeclaration2ES6.ts
new file mode 100644
index 00000000000..e50a455d824
--- /dev/null
+++ b/tests/cases/conformance/es6/destructuring/destructuringParameterDeclaration2ES6.ts
@@ -0,0 +1,20 @@
+//@target: es6
+"use strict"
+function a({while}) { }
+function a1({public}) { }
+function a2({public: x}) { }
+function a3({while: y}) { }
+function a4([while, for, public]){ }
+function a5(...while) { }
+function a6(...public) { }
+function a7(...a: string) { }
+
+class C {
+    constructor(public ...a) { }
+}
+
+
+a2({ public: 1 });
+a3({ while: 1 });
+a({ while: 1 });
+
diff --git a/tests/cases/conformance/es6/destructuring/destructuringParameterDeclaration3.ts b/tests/cases/conformance/es6/destructuring/destructuringParameterDeclaration3.ts
new file mode 100644
index 00000000000..96fc87c6c86
--- /dev/null
+++ b/tests/cases/conformance/es6/destructuring/destructuringParameterDeclaration3.ts
@@ -0,0 +1,23 @@
+function a([x, [y, z], [[j]]]) {
+    return [x, y, z, j];
+}
+
+function a1([...x]) {
+    return [x];
+}
+
+function a2({public} = { "public": "1" }) {
+    return public;
+}
+
+function a3({x: { y, z}, j: {k: {a}} }) {
+    return [y, z, a];
+}
+
+function a4({x: { y, z}, j: {k: {a}} } = { x: { y: 1, z: 1 }, j: { k: { a: "hello" } } }): (number| string) [] {
+    return [y, z, a];
+}
+
+function a5({x: { y, z}, j: {k: {a}} }): (number| string) [] {
+    return [y, z, a];
+}
diff --git a/tests/cases/conformance/es6/destructuring/destructuringParameterDeclaration3ES6.ts b/tests/cases/conformance/es6/destructuring/destructuringParameterDeclaration3ES6.ts
new file mode 100644
index 00000000000..7c50917ebe5
--- /dev/null
+++ b/tests/cases/conformance/es6/destructuring/destructuringParameterDeclaration3ES6.ts
@@ -0,0 +1,24 @@
+// @target: es6
+function a([x, [y, z], [[j]]]) {
+    return [x, y, z, j];
+}
+
+function a1([...x]) {
+    return [x];
+}
+
+function a2({public} = { "public": "1" }) {
+    return public;
+}
+
+function a3({x: { y, z}, j: {k: {a}} }) {
+    return [y, z, a];
+}
+
+function a4({x: { y, z}, j: {k: {a}} } = { x: { y: 1, z: 1 }, j: { k: { a: "hello" } } }): (number| string) [] {
+    return [y, z, a];
+}
+
+function a5({x: { y, z}, j: {k: {a}} }): (number| string) [] {
+    return [y, z, a];
+}
diff --git a/tests/cases/conformance/es6/destructuring/destructuringParameterDeclarationES6.ts b/tests/cases/conformance/es6/destructuring/destructuringParameterDeclarationES6.ts
new file mode 100644
index 00000000000..0d359421851
--- /dev/null
+++ b/tests/cases/conformance/es6/destructuring/destructuringParameterDeclarationES6.ts
@@ -0,0 +1,20 @@
+//@target: es6
+enum Foo { a }
+function a({x, a}: { x: number, a: number }) { }
+function a1({z: {x, y: {j}}}) { }
+function a2({z: {x, y: {j}}} = { z: { x: "hi", y: { j: 1 } } }) { }
+function a3({z} = {z:10}) { }
+function a4({z=10}) { }
+function a6({b}: { b: number|string|boolean } = { b: "hello" }) { }
+a2();
+a2({ z: { x: "hello" , y: { j: Foo.a } }});
+a3();
+a3({ z: Foo.a });
+a4({});
+a6({ b: 10 });
+a6({ b: true });
+
+// error
+a4();
+a3({});
+function a5([z], z: number) { }