I have a React application and every time I deploy it to digital ocean I’m getting this error SyntaxError: Unexpected token '<'
, but once you reload the page there’s no error and it loads properly. From my knowledge, it’s because it’s trying to locate the cached versions of the build files, but does anyone know how to fix this issue? Or bust the cache so that whenever I deploy, people don’t get broken pages until the reload?
I run env-cmd -f .env.production react-scripts build
to create a new production build before deploying the code.
package.json
{
"name": "react-app",
"version": "0.1.0",
"private": true,
"proxy": "https://50874c4689b8.ngrok.io",
"dependencies": {
"@alexcambose/react-infinite-scroll": "^1.0.1",
"@emotion/react": "^11.10.4",
"@emotion/styled": "^11.10.4",
"@mui/icons-material": "^5.10.3",
"@mui/lab": "^5.0.0-alpha.98",
"@mui/material": "^5.10.4",
"@mui/styles": "^5.10.3",
"@stripe/react-stripe-js": "^1.6.0",
"@stripe/stripe-js": "^1.20.3",
"@testing-library/jest-dom": "^5.11.4",
"@testing-library/react": "^11.1.0",
"@testing-library/user-event": "^12.1.10",
"@tinymce/tinymce-react": "^3.12.6",
"@types/array-move": "^2.0.0",
"@types/axios": "^0.14.0",
"@types/draftjs-to-html": "^0.8.1",
"@types/html-to-draftjs": "^1.4.0",
"@types/jest": "^26.0.22",
"@types/node": "^12.20.7",
"@types/react": "^17.0.3",
"@types/react-bootstrap": "^0.32.25",
"@types/react-dom": "^17.0.3",
"@types/react-draft-wysiwyg": "^1.13.3",
"@types/react-icons": "^3.0.0",
"@types/react-infinite-scroll-component": "^5.0.0",
"@types/react-infinite-scroller": "^1.2.2",
"@types/react-redux": "^7.1.16",
"@types/react-sortable-hoc": "^0.7.1",
"@types/react-toastify": "^4.1.0",
"@types/redux-logger": "^3.0.8",
"@types/redux-persist": "^4.3.1",
"@types/redux-thunk": "^2.1.0",
"@types/socket.io-client": "^3.0.0",
"@types/styled-components": "^5.1.9",
"array-move": "^3.0.1",
"axios": "^0.21.1",
"axios-hooks": "^2.6.1",
"bootstrap": "^4.6.0",
"draftjs-to-html": "^0.9.1",
"env-cmd": "^10.1.0",
"formik": "^2.2.6",
"gatsby-plugin-react-helmet": "^3.10.0",
"gatsby-plugin-react-helmet-async": "^1.2.1",
"html-to-draftjs": "^1.5.0",
"laravel-echo": "^1.11.3",
"laravel-echo-server": "^1.6.3",
"moment": "^2.29.1",
"moment-timezone": "^0.5.34",
"node-sass": "^7.0.1",
"pusher-js": "^7.0.6",
"react": "^17.0.2",
"react-adsense": "^0.1.0",
"react-apple-signin-auth": "^1.0.0",
"react-bootstrap": "^1.5.2",
"react-device-detect": "^2.1.2",
"react-dom": "^17.0.2",
"react-draft-wysiwyg": "^1.14.7",
"react-facebook-login": "^4.1.1",
"react-ga": "^3.3.0",
"react-google-button": "^0.7.2",
"react-google-login": "^5.2.2",
"react-helmet": "^6.1.0",
"react-helmet-async": "^1.3.0",
"react-icons": "^4.2.0",
"react-infinite-scroll-component": "^6.1.0",
"react-moment": "^1.1.1",
"react-redux": "^7.2.3",
"react-scripts": "^5.0.1",
"react-select": "^5.4.0",
"react-sliding-side-panel": "^2.0.3",
"react-smartbanner": "^5.1.4",
"react-sortable-hoc": "^2.0.0",
"react-toastify": "^7.0.4",
"recharts": "^2.1.10",
"redux-logger": "^3.0.6",
"redux-persist": "^6.0.0",
"redux-thunk": "^2.3.0",
"socket.io-client": "^4.1.3",
"styled-components": "^5.2.2",
"typescript": "^4.2.3",
"web-vitals": "^1.0.1",
"webpack": "^5.74.0",
"yup": "^0.32.9"
},
"resolutions": {
"@types/react": "17.0.3",
"@types/react-dom": "17.0.3"
},
"scripts": {
"start": "env-cmd -f .env.development react-scripts start",
"start:prod": "env-cmd -f .env.production react-scripts start",
"build": "react-scripts build",
"build:prod": "env-cmd -f .env.production react-scripts build",
"test": "react-scripts test",
"eject": "react-scripts eject"
},
"eslintConfig": {
"extends": [
"react-app",
"react-app/jest"
]
},
"browserslist": {
"production": [
">0.2%",
"not dead",
"not op_mini all"
],
"development": [
"last 1 chrome version",
"last 1 firefox version",
"last 1 safari version"
]
},
"devDependencies": {
"@types/react-facebook-login": "^4.1.3",
"@types/react-router-dom": "^5.1.7",
"react-router-dom": "^5.2.0"
}
}
src/reportWebVitals
import { ReportHandler } from "web-vitals";
const reportWebVitals = (onPerfEntry?: ReportHandler) => {
if (onPerfEntry && onPerfEntry instanceof Function) {
import("web-vitals").then(
({ getCLS, getFID, getFCP, getLCP, getTTFB }) => {
getCLS(onPerfEntry);
getFID(onPerfEntry);
getFCP(onPerfEntry);
getLCP(onPerfEntry);
getTTFB(onPerfEntry);
}
);
}
};
export default reportWebVitals;
src/index.tsx
import React from "react";
import ReactDOM from "react-dom";
import App from "./App";
import reportWebVitals from "./reportWebVitals";
import { Provider } from "react-redux";
import { persistor, store } from "./store";
import { PersistGate } from "redux-persist/integration/react";
import SmartBanner from "react-smartbanner";
import { isMobile } from "react-device-detect";
import "react-smartbanner/dist/main.css";
//imports for toastify css
import "react-toastify/dist/ReactToastify.css";
//import react sliding panel css
import "react-sliding-side-panel/lib/index.css";
//import my css last to overwrite anything above it
import "./index.css";
//imports for yup
import "core-js/es/promise";
import "core-js/es/set";
import "core-js/es/map";
import "core-js/es/array";
const userAgent = navigator.userAgent || navigator.vendor;
let device = undefined;
if (/android/i.test(userAgent)) {
device = "android";
} else if (/iPad|iPhone|iPod/.test(userAgent)) {
device = "ios";
}
ReactDOM.render(
<Provider store={store}>
<SmartBanner
force={isMobile ? device : undefined}
title="React-App"
/>
<PersistGate loading={null} persistor={persistor}>
<App />
</PersistGate>
</Provider>,
document.getElementById("root")
);
reportWebVitals();
App.tsx
import { useEffect } from "react";
import { useDispatch, useSelector } from "react-redux";
import { ThemeProvider } from "styled-components";
import { Elements } from "@stripe/react-stripe-js";
import { loadStripe } from "@stripe/stripe-js";
import ReactGA from "react-ga";
import { HelmetProvider, Helmet } from "react-helmet-async";
import PublicRouter from "./router/Public";
import { RootState } from "./store";
import { setTheme } from "./store/theme/actions";
import { ThemeState } from "./store/theme/types";
import darkTheme from "./themes/dark";
import lightTheme from "./themes/light";
import "bootstrap/dist/css/bootstrap.min.css";
import "./styles/app.scss";
declare module "styled-components" {
interface DefaultTheme extends ThemeState {}
}
ReactGA.initialize("UA-xxxxxxx-x");
ReactGA.pageview(window.location.pathname + window.location.search);
const stripePromise = loadStripe("pk_live_xxxxxxxxxxxxxxxxx");
function App() {
const dispatch = useDispatch();
const user = useSelector((state: RootState) => state.user);
const theme = useSelector((state: RootState) => state.theme);
const subscription = useSelector((state: RootState) => state.subscription);
useEffect(() => {
dispatch(setTheme(user.dark_mode ? darkTheme : lightTheme));
document.body.style.backgroundColor = theme.primary;
}, [user.dark_mode]);
useEffect(() => {
if (subscription) {
// Get the element you want to remove
var element = document.querySelectorAll(".google-ads-script");
// Get the parent and remove the element since it is a child of the parent
if (element) {
element.forEach((ele) => {
ele.remove();
});
}
}
}, [subscription]);
return (
<HelmetProvider>
<ThemeProvider theme={theme}>
<Elements stripe={stripePromise}>
{!subscription && (
<Helmet>
<script
id="google-ads-script"
async
src="https://pagead2.googlesyndication.com/pagead/js/adsbygoogle.js?client=ca-pub-xxxxxxxxxxxxxxxx"
crossorigin="anonymous"
></script>
</Helmet>
)}
<PublicRouter />
</Elements>
</ThemeProvider>
</HelmetProvider>
);
}
export default App;
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Hi there,
It sounds like a client-side caching rather than caching on the app side.
What you could do is to use Cache-Control header based on the language and framework of your app.
Alternatively, another workaround is to change the file name of the main JavaScript or CSS file that your React application uses. You can do this by adding a unique version number or hash to the end of the file name in your HTML file, so that the new file is unique and a cached version is not served to the end user.
Best,
Bobby