Ractive.extend options as TypeScript Class - http://jsfiddle.net/qnjgsq1L/

gistfile1.ts

function RactiveExtendTypeScriptClass(tsClass: any): RactiveStatic {
	var instance = new tsClass();
	var r = {};
	for (var key in instance) {
		r[key] = instance[key];
	}
	return Ractive.extend(r);
}

interface RactiveComponentPlugins {
	Animal: RactiveStatic;
}
class Animal implements RactiveExtendOptions {

	data = { 
		key: "value"
	};

	init(options: RactiveExtendOptions) {
		var self: Ractive = <any>this;
		self.add('a');
		console.log('init');
		console.log(options);
	}
}

Ractive.components.Animal = RactiveExtendTypeScriptClass(Animal);