feat(tslib): add tslib helpers to global (#6351)

* feat(tslib): add tslib helpers to global

* Adds tslib as a dependency to tns-core-modules
* Replaces globals/decorators with globals/tslib
* Adds support for async/await, rest and spread operators.

* refactor: rename tslib to ts-helpers to avoid confusion with npm package

package.json

@@ -39,7 +39,7 @@
     "shelljs": "^0.7.0",
     "source-map-support": "^0.4.17",
     "time-grunt": "1.3.0",
-    "tslib": "^1.7.1",
+    "tslib": "^1.9.3",
     "tslint": "^5.4.3",
     "typedoc": "^0.5.10",
     "typedoc-plugin-external-module-name": "git://github.com/PanayotCankov/typedoc-plugin-external-module-name.git#with-js",

tests/package.json

@@ -13,7 +13,8 @@
     }
   },
   "dependencies": {
-    "tns-core-modules": "*"
+    "tns-core-modules": "*",
+    "tslib": "^1.9.3"
   },
   "devDependencies": {
     "babel-traverse": "6.9.0",

tns-core-modules/globals/decorators.ts

@@ -1,32 +0,0 @@
-if (typeof (<any>global).__decorate !== "function") {
-    (<any>global).__decorate = function (decorators, target, key, desc) {
-        var c = arguments.length;
-        var r = c < 3 ? target : desc === null ? desc = Object.getOwnPropertyDescriptor(target, key) : desc, d;
-
-        if (typeof (<any>global).Reflect === "object" && typeof (<any>global).Reflect.decorate === "function") {
-            r = (<any>global).Reflect.decorate(decorators, target, key, desc);
-        }
-        else {
-            for (var i = decorators.length - 1; i >= 0; i--) {
-                if (d = decorators[i]) {
-                    r = (c < 3 ? d(r) : c > 3 ? d(target, key, r) : d(target, key)) || r;
-                }
-            }
-        }
-        return c > 3 && r && Object.defineProperty(target, key, r), r;
-    }
-}
-
-if (typeof (<any>global).__metadata !== "function") {
-    (<any>global).__metadata = function (k, v) {
-        if (typeof (<any>global).Reflect === "object" && typeof (<any>global).Reflect.metadata === "function") {
-            return (<any>global).Reflect.metadata(k, v);
-        }
-    };
-}
-
-if (typeof (<any>global).__param !== "function") {
-    (<any>global).__param = (global && (<any>global).__param) || function (paramIndex, decorator) {
-        return function (target, key) { decorator(target, key, paramIndex); }
-    };
-}

tns-core-modules/globals/globals.ts

@@ -1,18 +1,5 @@
 // Required by TypeScript compiler
-require("./decorators");
-
-// Required by V8 snapshot generator
-if (!global.__extends) {
-    global.__extends = function (d, b) {
-        for (var p in b) {
-            if (b.hasOwnProperty(p)) {
-                d[p] = b[p];
-            }
-        }
-        function __() { this.constructor = d; }
-        d.prototype = b === null ? Object.create(b) : (__.prototype = b.prototype, new __());
-    };
-}
+require("./ts-helpers");
 
 // This method iterates all the keys in the source exports object and copies them to the destination exports one.
 // Note: the method will not check for naming collisions and will override any already existing entries in the destination exports.

tns-core-modules/globals/ts-helpers.ts

@@ -0,0 +1,30 @@
+// Required by V8 snapshot generator
+if (!global.__extends) {
+  global.__extends = function (d, b) {
+      for (var p in b) {
+          if (b.hasOwnProperty(p)) {
+              d[p] = b[p];
+          }
+      }
+      function __() { this.constructor = d; }
+      d.prototype = b === null ? Object.create(b) : (__.prototype = b.prototype, new __());
+  };
+}
+
+import * as tslib from "tslib";
+
+// Bind the tslib helpers to global scope.
+// This is needed when we don't use importHelpers, which
+// breaks extending native-classes
+for (const fnName of Object.keys(tslib)) {
+  if (typeof tslib[fnName] !== "function") {
+    continue;
+  }
+
+  if (fnName in global) {
+    // Don't override globals that are already defined (ex. __extends)
+    continue;
+  }
+
+  global[fnName] = tslib[fnName];
+}

tns-core-modules/inspector_modules.ios.ts

@@ -1,5 +1,5 @@
 console.log("Loading inspector modules...");
-require("./globals/decorators");
+require("./globals/ts-helpers");
 require("./debugger/webinspector-network");
 require("./debugger/webinspector-dom");
 require("./debugger/webinspector-css");

tns-core-modules/package.json

@@ -26,7 +26,8 @@
   "license": "Apache-2.0",
   "typings": "tns-core-modules.d.ts",
   "dependencies": {
-    "tns-core-modules-widgets": "next"
+    "tns-core-modules-widgets": "next",
+    "tslib": "^1.9.3"
   },
   "devDependencies": {
     "@types/node": "~7.0.5",

tns-core-modules/ui/styling/style-properties.ts

@@ -495,7 +495,7 @@ export function transformConverter(text: string): TransformFunctionsInfo {
 
     const usedTransforms = transformations.map(t => t.property);
     if (!hasDuplicates(usedTransforms)) {
-        const fullTransformations = Object.assign({}, IDENTITY_TRANSFORMATION);
+        const fullTransformations = { ...IDENTITY_TRANSFORMATION };
         transformations.forEach(transform => {
             fullTransformations[transform.property] = transform.value;
         });

tns-platform-declarations/package.json

@@ -32,6 +32,6 @@
   },
   "homepage": "https://github.com/NativeScript/NativeScript#readme",
   "devDependencies": {
-    "typescript": "^2.6.1"
+    "typescript": "~2.6.1"
   }
 }