javascript - React component require.default undefined -


i've build following component:

import react 'react';  const app = () => (          <div classname="wrapper">             <h1>my app!!!!</h1>         </div>  );  export default app;

and use react-hot-loader boilerplate as:

import reactdom 'react-dom'; import react 'react'; import { appcontainer } 'react-hot-loader'; import app './component/app/app';  const dest = document.getelementbyid('content');  const render = (component) => {   reactdom.render(     <appcontainer>       <component />     </appcontainer>,     dest   ); };  render(app);  if (module.hot) {     module.hot.accept('./component/app/app', () => {         const nextapp = require('./component/app/app').default; // eslint-disable-line global-require           console.log('=====================================');         console.log(nextapp);         render(nextapp);     }); }

loading page fine, after updating app component different text, hmr giving error reloading page:

[hmr] connected client.js?6a8d:199 [hmr] bundle rebuilding client.js?6a8d:207 [hmr] bundle rebuilt in 557ms process-update.js:27 [hmr] checking updates on server... client.js:24 ===================================== client.js:25 undefined warning.js:36 warning: react.createelement: type invalid -- expected string (for built-in components) or class/function (for composite components) got: undefined. forgot export component file it's defined in. printwarning @ warning.js:36 warning @ warning.js:60 createelement @ reactelementvalidator.js:171 patchedcreateelement @ patch.dev.js:164 render @ client.js:11 (anonymous) @ client.js:26 hotapply @ bootstrap a9a1805…:566 cb @ process-update.js:52 (anonymous) @ process-update.js:68 process-update.js:115 [hmr] cannot check update (full reload needed) handleerror @ process-update.js:115 applycallback @ process-update.js:45 process-update.js:116 [hmr] invariant violation: element type invalid: expected string (for built-in components) or class/function (for composite components) got: undefined. forgot export component file it's defined in.     @ invariant (http://localhost:3001/dist/main-a9a1805da1160c9fe908.js:946:15)     @ reactcompositecomponentwrapper.instantiatereactcomponent [as _instantiatereactcomponent] (http://localhost:3001/dist/main-a9a1805da1160c9fe908.js:11215:55)     @ reactcompositecomponentwrapper._updaterenderedcomponent (http://localhost:3001/dist/main-a9a1805da1160c9fe908.js:19850:24)     @ reactcompositecomponentwrapper._performcomponentupdate (http://localhost:3001/dist/main-a9a1805da1160c9fe908.js:19813:10)     @ reactcompositecomponentwrapper.updatecomponent (http://localhost:3001/dist/main-a9a1805da1160c9fe908.js:19734:12)     @ reactcompositecomponentwrapper.receivecomponent (http://localhost:3001/dist/main-a9a1805da1160c9fe908.js:19636:10)     @ object.receivecomponent (http://localhost:3001/dist/main-a9a1805da1160c9fe908.js:3479:22)     @ reactcompositecomponentwrapper._updaterenderedcomponent (http://localhost:3001/dist/main-a9a1805da1160c9fe908.js:19843:23)     @ reactcompositecomponentwrapper._performcomponentupdate (http://localhost:3001/dist/main-a9a1805da1160c9fe908.js:19813:10)     @ reactcompositecomponentwrapper.updatecomponent (http://localhost:3001/dist/main-a9a1805da1160c9fe908.js:19734:12)

as can seen in console log, nextapp returning undefined, render(nextapp) failing.

why const nextapp = require('...').default returning undefined ? how solve issue ?

thanks helping.

are using webpack 2? should not require again. can call render(app) again inside accept callback. see here.


Comments

Post a Comment

Popular posts from this blog

commonjs - How to write a typescript definition file for a node module that exports a function? -

consider, toml node module can use: // toml.d.ts declare module toml { export function parse(value:string):any; } declare module "toml" { export = toml; } then: /// <reference path="../../../../../defs/toml/toml.d.ts"/> import toml = require('toml'); toml.parse(...); however, node module export single function, such 'glob' ( https://github.com/isaacs/node-glob ). the node usage of module be: var glob = require("glob") glob("*.js", {}, callback(err, files) { ... }); you'd naively expect this: // glob.d.ts declare function globs(paths:string, options:any, callback:{(err:any, files:string[]):void; ...but because typescripts 'import' semantics bit strange, seems can use 'import .. = require()' statement alias modules . trying call: /// <reference path="../../../../../defs/glob/glob.d.ts"/> import blog = require('glob'); results in: error ts2072: mod...
Read more

openid - Okta: Failed to get authorization code through API call -

i'm integrating okta own idp server using okta's api. i'm implementing authorization code flow following steps below: in own server, use /api/v1/authn endpoint sessiontoken. use sessiontoken obtain authorization calling endpoint: /oauth2/v1/authorize?client_id=" + clientid + "&sessiontoken=" + sessiontoken + "&response_type=code&response_mode=query&scope=openid&redirect_uri=" + redirecturl + "&state=evanyang&nonce=" it's supposed return response status code 302 , location header containing redirect url code value. however, keep getting response status code 200 , without location header, html body saying "you using unsupported browser." , "javascript disabled on browser." according api documentation: http://developer.okta.com/docs/api/resources/oidc.html#authentication-request , sessiontoken parameter sufficient this: an okta one-time sessiontoken. allows api-based ...
Read more

ios - Change Storyboard View using Seague -

i have following code checks connection server, , depending on want change views if no connection found. nsstring *connect = [nsstring stringwithcontentsofurl:[nsurl urlwithstring:@"http://myserver.com"] encoding:nsutf8stringencoding error:nil]; if (connect == null) { [self performseguewithidentifier:@"network_failure" sender:self]; } else { // other code here } my problem not change views. have added storyboard segue between 2 views identifier of network_failure . not have navigation controller or that, problem? thanks help! no not problem. first of all, in objectivec exists nil object oriented null . must use that. so: if(connect == nil) or better: if(!connect) so due fact nil not same of null , probably code does't enter in if scope . you have been able discover breakpoint. anyway: be sure set trigger segue (line) 2 view controller , , name network_failure (that not best name. should instead view1toview2 ) as, m...
Read more