Question

我有一个进行网络呼叫的功能，我希望这个功能全局可用，而不必每次我需要使用该功能时都要导入它

Request.js

import 'whatwg-fetch';

/**
 * Parses the JSON returned by a network request
 *
 * @param  {object} response A response from a network request
 *
 * @return {object}          The parsed JSON from the request
 */
function parseJSON(response) {
  if (response.status === 204 || response.status === 205) {
    return null;
  }
  return response.json();
}

/**
 * Checks if a network request came back fine, and throws an error if not
 *
 * @param  {object} response   A response from a network request
 *
 * @return {object|undefined} Returns either the response, or throws an error
 */
function checkStatus(response) {
  if (response.status >= 200 && response.status < 300) {
    return response;
  }
  const error = new Error(response.statusText);
  error.response = response;
  throw error;

}

/**
 * Requests a URL, returning a promise
 *
 * @param  {string} url       The URL we want to request
 * @param  {object} [options] The options we want to pass to "fetch"
 *
 * @return {object}           The response data
 */
export default function request(url, options) {
  return fetch(url, options)
    .then(checkStatus)
    .then(parseJSON);
}

Webpack.config.js

    plugins: [
      new webpack.ProvidePlugin({
        fetch: 'exports-loader?self.fetch!whatwg-fetch',
        request : require.resolve(path.join(process.cwd(),'app/utils/request.js'))
      })]

因此，当我尝试在任何其他文件中使用请求函数时，它会抛出错误，指出“找不到模块”。我还尝试添加一条规则（Shimming），但也无效。

提前致谢：）

Answer 1

在Webpack docs：

要导入ES2015模块的默认导出，您必须这样做指定module的默认属性。

所以只需将配置更改为以下内容：

plugins: [
  new webpack.ProvidePlugin({
    fetch: 'exports-loader?self.fetch!whatwg-fetch',
    request: [path.resolve('app/utils/request.js'), 'default']
  })
]

使用webpack ProvidePlugin全局导入javascript文件

1 个答案: