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';

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

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

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

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