javascript - Typescript: Property does not exist -

i'm trying develop decorator rest api interfaces in typescript. here decorator implementation

export function remoteresource(params: any): function {     console.log("remoteresource.params: ", params);     return function (target: function) {          //--post         target.prototype.post = function () {             console.log("----post");         };          //--get         target.prototype.retrieve = function () {             console.log("----get");         };          //--delete         target.prototype.remove = function () {             console.log("----delete");         };          //--pull         target.prototype.update = function () {             console.log("----pull");         };          console.log("remoteresource.target: ", target);          return target;     } } 

now, can use decorator @remoteresource , methods post|retrieve|remove|update added original object prototype correctly.

@remoteresource({     path: "/foos",     methods: [],     requireauth: false }) export class foo { } 

from here, if execute

let tester = new foo(); tester.post() //--this prints out "----post" correctly 

i've log printed out correctly, i've have following error: "property 'post' not exist on type 'foo'." while understand why i'm having error (foo doesn't have declared post property) i'm not sure how fix it.

ideally, ts compiler understand decorator extends original object adding methods.

how can achieve it? ideas?

thanks!

since adding these methods dynamically @ runtime in decorator, compiler has no way of knowing these methods exist foo instances.

you can change in different ways, example:

(1) using interface , intersection:

interface remoteresource {     post(): void;     remove(): void;     update(): void;     retrieve(): void; }  let tester = new foo() foo & remoteresource; tester.post(); // no error 

(2) interface , empty methods:

export class foo implements remoteresource {     post: () => void;     remove: () => void;     update: () => void;     retrieve: () => void; }  let tester = new foo() foo & remoteresource; tester.post(); 

---

edit

@robba suggests:

(3) ignore type checking

let tester = new foo() any; tester.post(); 

or

let tester = new foo(); tester["post"]();