streamInterface([observable], propAndOrEvent[,event])

The stream interface function returned from can-stream that will be used to add streamable props to a provided DefineMap.prototype or DefineList.prototype and has the following property methods:

• .toStream(observable, propAndOrEvent[,event])
• .toStreamFromProperty(property)
• .toStreamFromEvent(property)
• .toCompute(makeStream(setStream), context):compute

import DefineMap from "can-define/map/map";
import canDefineStream from "can-define-stream";
import streamInterface from "can-stream-kefir";

const Person = DefineMap.extend( {
    first: "string",
    last: "string",
    fullName: {
        get: function() {
            return this.first + " " + this.last;
        }
    }
} );

const john = new Person( { first: "John" } );
john.toStream( ".first" ); //-> Error (toStream doesn't exist)

const defineStreamAdder = canDefineStream( streamInterface );
defineStreamAdder( Person );

const justin = new Person( { first: "Justin" } );
justin.toStream( ".first" ); //-> Stream