a basic working version of can-derive

.gitignore

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+node_modules/

LICENSE

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+The MIT License (MIT)
+
+Copyright (c) 2015 CanJS
+
+Permission is hereby granted, free of charge, to any person obtaining a copy
+of this software and associated documentation files (the "Software"), to deal
+in the Software without restriction, including without limitation the rights
+to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+copies of the Software, and to permit persons to whom the Software is
+furnished to do so, subject to the following conditions:
+
+The above copyright notice and this permission notice shall be included in all
+copies or substantial portions of the Software.
+
+THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
+SOFTWARE.
+

can-define.js

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+
+var can = require("can/util/");
+var event = require("can/event/");
+var compute = require("can/compute/");
+var Map = require("can/map/");
+var mapHelpers = require("can/map/map_helpers");
+
+
+
+module.exports = function(objPrototype, defines){
+
+	// Copy every method on Map
+	can.each(Map.prototype, function(value, prop){
+		objPrototype[prop]= value;
+	});
+
+	objPrototype.___set = function (prop, val) {
+		var computedAttr = this._computedAttrs[prop];
+		if ( computedAttr ) {
+			computedAttr.compute(val);
+		} else {
+			this._data[prop] = val;
+		}	
+	};
+
+	Object.defineProperty(objPrototype, "_computedAttrs", {
+		get: function(){
+			if(!this.__computeAttrs) {
+				this.__computeAttrs = {};
+				for (var attr in defines) {
+					var def = defines[attr],
+						get = def.get;
+					if (get) {
+						mapHelpers.addComputedAttr(this, attr, can.compute.async(undefined, get, this));
+					}
+				}
+
+			}
+			return this.__computeAttrs;
+		}
+	});
+	Object.defineProperty(objPrototype, "_data", {
+		get: function(){
+			if(!this.__data) {
+				this.__data = {};
+			}
+			return this.__data;
+		}
+	});
+
+
+	can.each(defines, function(value, prop){
+		Object.defineProperty(objPrototype, prop,{
+			get: function(){
+				return this._get(prop);
+			},
+			set: function(val){
+				return this._set(prop, val);
+			}
+		});
+	});
+
+
+
+	return objPrototype;
+};

package.json

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+{
+  "name": "can-define",
+  "version": "0.0.1",
+  "description": "Like can.Map, but without the .attr method.",
+  "main": "can-define.js",
+  "scripts": {
+    "test": "echo \"Error: no test specified\" && exit 1"
+  },
+  "repository": {
+    "type": "git",
+    "url": "https://github.com/canjs/can-define"
+  },
+  "keywords": [
+    "CanJS"
+  ],
+  "author": "Bitovi",
+  "license": "MIT",
+  "bugs": {
+    "url": "https://github.com/canjs/can-define/issues"
+  },
+  "homepage": "https://github.com/canjs/can-define",
+  "dependencies": {
+    "can": "^2.3.0",
+    "jquery": "^2.1.4",
+    "steal": "^0.12.0",
+    "steal-qunit": "^0.1.1"
+  }
+}

test.html

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+<script src="./node_modules/steal/steal.js" main="can-define/test"></script>

test.js

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+var QUnit =  require("steal-qunit");
+var compute = require("can/compute/");
+var define = require("can-define");
+var stache = require("can/view/stache/");
+
+
+QUnit.test("basics on a prototype", function(){
+
+	var Person = function(first, last){
+		this.first = first;
+		this.last = last;
+	};
+	define(Person.prototype,{
+		first: {
+			type: "string"
+		},
+		last: {
+			type: "string"
+		},
+		fullName: {
+			get: function(){
+				return this.first+" "+this.last;
+			}
+		}
+	});
+
+	var p = new Person("Mohamed", "Cherif");
+
+	p.bind("fullName", function(ev, newVal, oldVal){
+		QUnit.equal(oldVal, "Mohamed Cherif");
+		QUnit.equal(newVal, "Justin Meyer");
+	});
+
+	p.bind("first", function(el, newVal, oldVal){
+		QUnit.equal(newVal, "Justin", "first new value");
+		QUnit.equal(oldVal, "Mohamed", "first old value");
+	});
+
+	can.batch.start();
+	p.first = "Justin";
+	p.last = "Meyer";
+	can.batch.stop();
+
+});
+
+