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    <p>One solution is to not use the typescript class system , but just the systeme of types and interfaces, in addition to the keyword 'new'.</p> <pre><code> //the function that create class function Class(construct : Function, proto : Object, ...mixins : Function[]) : Function { //... return function(){}; } module Test { //the type of A export interface IA { a(str1 : string) : void; } //the class A //&lt;new () =&gt; IA&gt; === cast to an anonyme function constructor that create an object of type IA, // the signature of the constructor is placed here, but refactoring should not work //Class(&lt;IA&gt; { === cast an anonyme object with the signature of IA (for refactoring, but the rename IDE method not work ) export var A = &lt;new () =&gt; IA&gt; Class( //the constructor with the same signature that the cast just above function() { } , &lt;IA&gt; { //!! the IDE does not check that the object implement all members of the interface, but create an error if an membre is not in the interface a : function(str : string){} } ); //the type of B export interface IB { b() : void; } //the implementation of IB export class B implements IB { b() { } } //the type of C export interface IC extends IA, IB{ c() : void; mystring: string; } //the implementation of IC export var C = &lt;new (mystring : string) =&gt; IC&gt; Class( //public key word not work function(mystring : string) { //problem with 'this', doesn't reference an object of type IC, why?? //but google compiler replace self by this !! var self = (&lt;IC&gt; this); self.mystring = mystring; } , &lt;IC&gt; { c : function (){}, //override a , and call the inherited method a: function (str: string) { (&lt;IA&gt; A.prototype).a.call(null, 5);//problem with call and apply, signature of call and apply are static, but should be dynamic //so, the 'Class' function must create an method for that (&lt;IA&gt; this.$super(A)).a(''); } }, //mixins A, B ); } var c = new Test.C(''); c.a(''); c.b(); c.c(); c.d();//ok error ! </code></pre>
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