我需要在自定义反应组件的shouldComponentUpdate函数中使用shallowCompare函数。我得到以下错误:无法导入react-addons-shallow-compare,Typescript
app.js:95084 Uncaught TypeError: Cannot read property 'shallowCompare' of undefined
我已经安装了反应 - 插件 - 浅比较版本15.3.0,我发现它在node_modules。它看起来像这样:
module.exports = require('react/lib/shallowCompare');
而这是shallowCompare.js引用。
/**
* Copyright 2013-present, Facebook, Inc.
* All rights reserved.
*
* This source code is licensed under the BSD-style license found in the
* LICENSE file in the root directory of this source tree. An additional grant
* of patent rights can be found in the PATENTS file in the same directory.
*
* @providesModule shallowCompare
*/
'use strict';
var shallowEqual = require('fbjs/lib/shallowEqual');
/**
* Does a shallow comparison for props and state.
* See ReactComponentWithPureRenderMixin
* See also https://facebook.github.io/react/docs/shallow-compare.html
*/
function shallowCompare(instance, nextProps, nextState) {
return !shallowEqual(instance.props, nextProps) || !shallowEqual(instance.state, nextState);
}
module.exports = shallowCompare;
我也安装了类型。我有这个版本:
// Generated by typings
// Source: https://raw.githubusercontent.com/DefinitelyTyped/DefinitelyTyped/6a36f6d5b61602b6c4ad932599097135e80abaf4/react/react-addons-shallow-compare.d.ts
declare namespace __React {
namespace __Addons {
export function shallowCompare<P, S>(
component: __React.Component<P, S>,
nextProps: P,
nextState: S): boolean;
}
}
declare module "react-addons-shallow-compare" {
var shallowCompare: typeof __React.__Addons.shallowCompare;
export = shallowCompare;
}
现在我试图导入它并将其用于我的一个文件中。我已经尝试过每种导入策略。
import { __Addons as ReactAddons } from "react";
/* ... other stuff ... */
ReactAddons.shallowCompare(this, nextProps, nextState);
或者
import shallowCompare = require("react-addons-shallow-compare");
/* ... other stuff ... */
shallowCompare(this, nextProps, nextState);
或者
import shallowCompare = __React.__Addons.shallowCompare;
/* ... other stuff ... */
shallowCompare(this, nextProps, nextState);
在最后一种情况下,我得到的错误是不是上面提到的,但
Uncaught ReferenceError: __React is not defined
作为提,我正在使用Typescript 1.8.10。
对于它的价值,我也收到以下错误:
Failed to parse SourceMap
我挺憋屈的这一段时间了。一些帮助将不胜感激。
谢谢!
你有没有试过const shallowCompareCompare = require('react-addons-shallow-compare'); ? – QoP
@QoP我得到一个错误,如果我尝试这样做:'错误TS2349:不能调用一个表达式,其类型缺少一个调用签名。'是不是应该有一个'import'的地方? –
是的,你可以使用import - >'import shallowCompare from'react-addons-shallow-compare'' – QoP