Method apply

packages/dva-core/src/Plugin.js:54–72

(key, defaultHandler)

  }

  apply(key, defaultHandler) {
    const hooks = this.hooks;
    const validApplyHooks = ['onError', 'onHmr'];
    invariant(
      validApplyHooks.indexOf(key) > -1,
      `plugin.apply: hook ${key} cannot be applied`
    );
    const fns = hooks[key];

    return (...args) => {
      if (fns.length) {
        for (const fn of fns) {
          fn(...args);
        }
      } else if (defaultHandler) {
        defaultHandler(...args);
      }
    };
  }

  get(key) {
    const hooks = this.hooks;