I had a really interesting debugging experience last night so I thought I'd share
On gatsby#4.4 + gatsby-plugin-image#2.4 + Netlify (may not matter) I noticed that I was not able to see GatsbyImage components under these specific circumstances:
only on initial load (hitting a nav button rendered the images)
only on desktop and on Chrome
only in prod (Images were loading perfectly in localhost after running gatsby develop )
The issue for me was that when I migrated from v2 to v4 and swapped out gatsby-image to the recommended gatsby-plugin-image, I forgot to add it to gatsby-config. For whatever reason, using {GatsbyImage} from the newer gatsby-plugin-image does not throw any errors even if you don't add it to gatsby-config. Not only that, the dev preview in localhost will show images rendering perfectly.
To make things even more confusing, {StaticImage} appears to NOT work if the plugin is not loaded in config and Gatsby will correctly tell you that something is wrong.
Anyways, my takeaway is.. always check that all plugins are added to config because in certain cases there is no error handling for that. And always check out dev AND prod builds before pushing code!
Related
I'm currently implementing the Monaco Editor from Microsoft (https://github.com/microsoft/monaco-editor), with a plugin for yaml validation, autocompletion, etc. . (https://github.com/remcohaszing/monaco-yaml) in our react js APP.
Maybe it is also important to tell you, that our authentication process gets managed via Keycloak.
When I'm running my code in development (React-scripts start) everything is working as expected.
I can create the editor, the schema gets implemented correctly and autocompletion is also working.
BUT as soon as I try to use the editor in PRODUCTION Build it seems that it cant load my workers correctly, following the editor is not working as it should.
I always get these errors in production:
I tried to use monaco-editor-webpack-plugin with React Rewired but it didnt have an positive effect either.
I also tried to use the worker loader to load the workers, but it also didnt help
Any more Ideas how I can fix this ? Has this to do something with CORS ? Because it tries to load files in a url? Or am I missing something ?
Thanks in advance
What I tried: Monaco Webpack Plugin, plain webpack, worker-loader
Expected Behaviour: Monaco Editor with Monaco Yaml working in production build.
Current behaviour: Working fine in development build, cannot load workers in production.
The problem was, that my keycloak (on a different port) rejected to load the working scripts. After handling this problems, the editor is working fine.
My basic static React Redux TypeScript app works locally on Windows, and then it also works when I deploy to GitHub Pages for every device I've tested except iPhone 6 iOS 12.0.1 (where it is a blank white screen).
I've researched many articles, such as:
React/redux app renders blank screen on Safari
React/Node Uncaught SyntaxError: Unexpected token <
Why deployed react app on gh-pages is showing blank page on different browsers while showing correctly on my browser?
https://stackoverflow.com/a/57027870/470749
https://community.netlify.com/t/react-application-builds-deploys-into-a-blank-page/2571
https://github.com/facebook/create-react-app/blob/061d1e46fcd4766d38b45499c3d29cfaa2b7d0af/packages/react-scripts/template/README.md#github-pages
https://caniuse.com/#feat=es6
Most of them try to solve the case where all devices show a white page. But that's not my scenario.
Others talk about how older browsers need polyfills, but I've already added try/catch blocks around my use of fetch.
I've also tried changing to "homepage": "." in package.json, but again, I don't think that's related to the issue because most browsers already work, so I know that the assets are being accessed.
Any ideas?
Finally I remembered that I could use the free http://xip.io/ service to browse from my iPhone to the "local" React server hosted on my Windows machine.
That way, I could see error messages that wouldn't be visible on production (at GitHub Pages).
I discovered that the error was "ReferenceError: Can't find variable: IntersectionObserver".
So the solution would be to use a polyfill.
See helpful links:
https://stackoverflow.com/a/55767479/470749
https://stackoverflow.com/a/59368511/470749
https://github.com/mhartington/lazy-load-image/issues/1#issuecomment-372384646
https://webkit.org/blog/8582/intersectionobserver-in-webkit/
https://caniuse.com/#feat=intersectionobserver
"IntersectionObserver API is supported on iOS Safari since 12.2." That explains why it worked on other iPhones but not mine.
I have a reactJS SSR app deployed into server, I am trying to use one of the page /listpage as a widget into some other website
The list page is appearing nicely in other website however some of the click actions were not working, when I debugged it I found that the issue was with serving reactjs static js chunk files which were created by react run build. The issue was with relative path /static/js/xxxx
to fix this issue, one solution is to have a full path reference, to enable that I added homepage:"" in package.json
this worked and when I checked network tab in chrome browser i could see all static js files are referred using full path.
however a strange issue occurred , the whole list widget appears and suddenly disappears , when I inspect the elements I could see nothing inside thats where all react components suppose to be rendered.
for full code of SSR project kindly refer with explanation.
however the full code is in github
have very simple sample app which build Create React App + Styled-Components to prove this issue. But I have real big application which I am facing this issue which I am going to explain it below.
I would like to pre-render this app with Rendertron for SEO/GoogleBots and etc. But the problem is when I build PRODUCTION version of React App which use Styled-Components . all the style will be missing on static version which Rendertron produced, but from other side if I try the same workflow with dev-server of app , everything looks fine .
So far I know there is different on PROD version and DEV version of my application when I render it with Rendertron . But I am not sure what cause this issue and how I can fix this issue .
I am looking for solution or idea which can help me to solve this issue .
Here is my sample code which I peppered for test .
https://github.com/AJ-7885/test-styled-component-with-rendertron
Here is screen shot from different version of Rendered version by Rendertron base on PROD or DEV version of the same application .
enter image description here
After a lot of searching around, I finally found out the reason. The Styled Components library uses something called the "Speedy mode" to inject styles on production. This makes the styles bypass the DOM` and be injected directly inside the CSSOM, thus, appearing in the inspector, but totally invisible on the DOM.
Fortunately, Styled Components 4.1.0 came with a fix for this issue! Now you can set a global variable called SC_DISABLE_SPEEDY to true in order to disable the Speedy mode and get the styles to appear on Production as well.
Reference: https://www.styled-components.com/releases#v4.1.0
But the only part I am not sure , how to set disable this Speedy Mode in Create-React-App without Ejecting , Dose any body has any idea ?
You need to render your styles on the server side and inject those styles in your pre-rendered react app. Styled-components explains how to do that here: https://www.styled-components.com/docs/advanced#server-side-rendering
Also, I'd recommend using react-snap for pre-rendering since that is recommended by the Create React App docs. react-snap seems to be more of a React-specific solution that may be easier to implement, especially with styled-components.
Recently, I downloaded mern.io. The nice thing is they have bundled everything for me. But I am kind of lost. In my last project whenever I changed something on client I could refresh browser and see the changes. With MERN I always see:
webpack building...
webpack built e9c15d7d435381a63771 in 1043ms
At first it was replacing the code on client. Now, I can't make it to propagate changes any more.
Maybe it's an issue with https://github.com/gaearon/react-hot-loader
What am I missing?
Do I have to clean the webpack or caches somehow?
EDIT
The config files can be seen here: https://github.com/Hashnode/mern-starter
The webpack ones are webpack.config.*.js
EDIT 2
The computer restart helped me but only for the first load of the page. I have found this message in the console:
XMLHttpRequest cannot load http://0.0.0.0:8000/50d9888579520587227e.hot-update.json
Which led me here: https://github.com/gaearon/react-hot-loader/issues/56