fix: Allow to assign Array.of and Array.from to a variable at Interne…

…t Explorer 9

.babelrc

@@ -10,6 +10,13 @@
 		"transform-object-spread-inline",
 		["transform-es2015-template-literals", { "loose": true }],
 		["transform-es2015-destructuring", { "loose": true }],
-		["transform-es2015-computed-properties", { "loose": true }]
+		["transform-es2015-computed-properties", { "loose": true }],
+
+		// the following plugins are used at tests
+		"transform-es2015-classes",
+		"transform-es2015-for-of",
+        ["transform-es2015-spread", {
+          "loose": true
+        }]
 	]
 }

src/array/from.js

@@ -4,7 +4,7 @@ import cheapRecreate from './_cheaprecreate';
 export default function from(arrayLike, mapFn, thisArg) {
     // allow to inherit this method by child classes
     // require('./') fixes circular ref issue
-    const ParentClass = this || require('./');
+    const ParentClass = typeof this === 'function' ? this : require('./');
 
     const result = new ParentClass();
     const length = arrayLike.length;

src/array/of.js

@@ -5,7 +5,7 @@ import cheapRecreate from './_cheaprecreate';
 export default function of() {
     // allow to inherit this method by child classes
     // require('./') fixes circular ref issue
-    const ParentClass = this || require('./');
+    const ParentClass = typeof this === 'function' ? this : require('./');
 
     const result = new ParentClass();
     const newItems = Array(arguments.length);

test/spec/matreshka_array/static_methods_spec.js

@@ -1,5 +1,6 @@
 /* eslint-disable import/no-extraneous-dependencies, import/extensions */
 import MatreshkaArray from 'src/array';
+import Class from 'src/class';
 
 describe('Matreshka.Array static methods (of and from)', () => {
     it('converts an array to Matreshka.Array instance via Matreshka.Array.from', () => {
@@ -14,7 +15,7 @@ describe('Matreshka.Array static methods (of and from)', () => {
 
     it('allows to inherit Matreshka.Array.from', () => {
         const items = [1, 2, 3];
-        class OwnerClass extends MatreshkaArray {}
+        const OwnerClass = Class({'extends': MatreshkaArray});
         const arr = OwnerClass.from(items);
 
         expect(arr instanceof OwnerClass).toBe(true);
@@ -46,7 +47,7 @@ describe('Matreshka.Array static methods (of and from)', () => {
 
     it('allows to inherit Matreshka.Array.of', () => {
         const items = [1, 2, 3];
-        class OwnerClass extends MatreshkaArray {}
+        const OwnerClass = Class({'extends': MatreshkaArray});
         const arr = OwnerClass.of(...items);
 
         expect(arr instanceof OwnerClass).toBe(true);