ionic-framework/ionic/config/decorators/config-component.ts

import {Component} from 'angular2/core'
import {pascalCaseToDashCase} from '../../util/util';


/**
 * @private
 */
export function ConfigComponent(config) {
  return function(cls) {
    var annotations = Reflect.getMetadata('annotations', cls) || [];
    annotations.push(new Component(appendConfig(cls, config)));
    Reflect.defineMetadata('annotations', annotations, cls);
    return cls;
  }
}

/**
 * @private
 */
function appendConfig(cls, config) {
  config.host = config.host || {};

  cls.defaultInputs = config.defaultInputs || {};

  config.inputs = config.inputs || [];

  for (let prop in cls.defaultInputs) {
    // add the property to the component "inputs"
    config.inputs.push(prop);

    // set the component "hostProperties", so the instance's
    // input value will be used to set the element's attribute
    config.host['[attr.' + pascalCaseToDashCase(prop) + ']'] = prop;
  }

  cls.delegates = config.delegates;

  return config;
}