walkaround babel

 which not support extends bulitin

package.json

@@ -1,6 +1,6 @@
 {
   "name": "mutable-promise",
-  "version": "1.1.9",
+  "version": "1.1.10",
   "description": "Wrapper for Promise. Resolvable, rejectable, redirectable.",
   "files": [
     "/dist",

src/index.ts

@@ -5,7 +5,7 @@ type Executor<T> = (resolve: Resolve<T>, reject: Reject) => void;
 
 const isPromiseLike = (value:any) => (value && "object" === typeof value && "function" === typeof value.then);
 
-class MutablePromise<T> extends Promise<T>{
+class MutablePromise<T>{ //extends Promise<T>{
 
     private _s: string;
     get status(){ return this._s; }
@@ -48,11 +48,18 @@ class MutablePromise<T> extends Promise<T>{
     resolve: Resolve<T>
     reject: Reject;
 
+    // walkaround babel which can not extend builtin class
+    then: (onfulfilled?: (value: T) => any, onrejected?: (reason: any) => any) => Promise<any>;
+
     constructor(executor?: PromiseLike<T> | Executor<T> | null){
         let rs: Resolve<T>;
         let rj: Reject;
         const fn = (_rs: Resolve<T>, _rj: Reject)=>{ rs = _rs; rj = _rj; };
-        super(fn);
+        // super(fn);
+
+        // walkaround babel which can not extend builtin class
+        this.then = (new Promise(fn).then);
+
         this._s = "pending";
         this.resolve = (value: ResolveValue<T>)=>{
             if(this.isPending){