Adds minimal support for 'this' types in decorator metadata, emitting 'Object' for now.

src/compiler/emitter.ts

@@ -6006,6 +6006,7 @@ var __awaiter = (this && this.__awaiter) || function (thisArg, _arguments, Promi
                         case SyntaxKind.UnionType:
                         case SyntaxKind.IntersectionType:
                         case SyntaxKind.AnyKeyword:
+                        case SyntaxKind.ThisType:
                             break;
 
                         default:

tests/baselines/reference/decoratorMetadata.js

@@ -12,6 +12,10 @@ declare var decorator: any;
 class MyComponent {
     constructor(public Service: Service) {
     }
+
+    @decorator
+    method(x: this) {
+    }
 }
 
 //// [service.js]
@@ -37,6 +41,14 @@ var MyComponent = (function () {
     function MyComponent(Service) {
         this.Service = Service;
     }
+    MyComponent.prototype.method = function (x) {
+    };
+    __decorate([
+        decorator, 
+        __metadata('design:type', Function), 
+        __metadata('design:paramtypes', [Object]), 
+        __metadata('design:returntype', void 0)
+    ], MyComponent.prototype, "method", null);
     MyComponent = __decorate([
         decorator, 
         __metadata('design:paramtypes', [service_1.default])

tests/baselines/reference/decoratorMetadata.symbols

@@ -19,4 +19,12 @@ class MyComponent {
 >Service : Symbol(Service, Decl(component.ts, 6, 16))
 >Service : Symbol(Service, Decl(component.ts, 0, 6))
     }
+
+    @decorator
+>decorator : Symbol(decorator, Decl(component.ts, 2, 11))
+
+    method(x: this) {
+>method : Symbol(method, Decl(component.ts, 7, 5))
+>x : Symbol(x, Decl(component.ts, 10, 11))
+    }
 }

tests/baselines/reference/decoratorMetadata.types

@@ -19,4 +19,12 @@ class MyComponent {
 >Service : Service
 >Service : Service
     }
+
+    @decorator
+>decorator : any
+
+    method(x: this) {
+>method : (x: this) => void
+>x : this
+    }
 }

tests/cases/conformance/decorators/decoratorMetadata.ts

@@ -14,4 +14,8 @@ declare var decorator: any;
 class MyComponent {
     constructor(public Service: Service) {
     }
+
+    @decorator
+    method(x: this) {
+    }
 }