@eva/react-eva/es/misc/preload.js

React EVA是一个让开发同学能够在React技术体系下，利用EVA JS的游戏研发能力，开发动画、游戏类场景的框架。它可以让开发同学用熟悉的JSX和Hooks语法编写动画、游戏场景的代码。

import { resource, LOAD_EVENT } from '@eva/eva.js';
export var Preload = /*#__PURE__*/function () {
  function Preload() {
    this.resources = {};
  }

  var _proto = Preload.prototype;

  _proto.onStart = function onStart(fn) {
    var handler = fn;
    resource.on(LOAD_EVENT.START, handler);
    return this;
  };

  _proto.onProgress = function onProgress(fn) {
    var handler = fn;
    resource.on(LOAD_EVENT.PROGRESS, handler);
    return this;
  };

  _proto.onLoaded = function onLoaded(fn) {
    var handler = fn;
    resource.on(LOAD_EVENT.LOADED, handler);
    return this;
  };

  _proto.onComplete = function onComplete(fn) {
    var handler = fn;
    resource.on(LOAD_EVENT.COMPLETE, handler);
    return this;
  };

  _proto.onError = function onError(fn) {
    var handler = fn;
    resource.on(LOAD_EVENT.ERROR, handler);
    return this;
  };

  return Preload;
}();
export default new Preload();