ContractorJS

contractorJS.js

var assert = require('assert');

var contractor = function ( options, contract ) {
	var keys = Object.keys( contract );

	if ( typeof options === 'object' ) {
		keys.forEach( function ( key ) {
			assert.equal( typeof options[key], contract[key] );
		} );
	} else {
		throw new Error( 'options is not an object' );
	}
};

var doSomething = function ( myAbstractObjAsArgument ) {
	contractor( myAbstractObjAsArgument
	          , { response: 'object'
	            , fileName: 'string'
	            , language: 'string'
	            } );

	console.log( 'ok' );
};

try {
	doSomething( { response: { uno: 2 }, fileName: 'hola', language: 'ok' } );
} catch (e) {
	console.error( 'error', e.message );
}