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‎.gitignore‎

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# See https://help.github.com/articles/ignoring-files/ for more about ignoring files.
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# dependencies
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/node_modules
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/.pnp
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.pnp.js
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# testing
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/coverage
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# production
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/build
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# misc
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.DS_Store
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.env.local
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.env.development.local
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.env.test.local
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.env.production.local
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npm-debug.log*
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yarn-debug.log*
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yarn-error.log*

‎README.md‎

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# Example of Resize Observer API with React
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- [Demo](https://example-react-resize-observer.sethcorker.com/)
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- My [article describing the Resize Observer API in a bit more detail](https://blog.sethcorker.com/resize-observer-api/)
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## What is this?
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An example of the Resize Observer API being used in React with a custom hook.
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## How can I run it?
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Once you've cloned the repo, make sure you have node and npm installed. Then just run the usual:
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`npm start`
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Runs the app in the development mode.<br>
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Open [http://localhost:3000](http://localhost:3000) to view it in the browser.
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The page will reload if you make edits.<br>
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You will also see any lint errors in the console.

‎package-lock.json‎

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‎package.json‎

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{
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"name": "example-react-resize-observer",
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"version": "0.1.0",
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"private": true,
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"dependencies": {
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"react": "^16.10.1",
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"react-dom": "^16.10.1",
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"react-scripts": "3.1.2"
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},
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"scripts": {
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"start": "react-scripts start",
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"build": "react-scripts build",
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"test": "react-scripts test",
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"eject": "react-scripts eject"
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},
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"eslintConfig": {
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"extends": "react-app"
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},
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"browserslist": {
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"production": [
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">0.2%",
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"not dead",
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"not op_mini all"
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],
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"development": [
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"last 1 chrome version",
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"last 1 firefox version",
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"last 1 safari version"
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]
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}
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}

‎public/favicon.ico‎

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‎public/index.html‎

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<!DOCTYPE html>
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<html lang="en">
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<head>
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<meta charset="utf-8" />
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<link rel="shortcut icon" href="%PUBLIC_URL%/favicon.ico" />
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<meta name="viewport" content="width=device-width, initial-scale=1" />
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<link
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rel="stylesheet"
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href="https://unpkg.com/papercss@1.6.1/dist/paper.min.css"
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/>
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<meta name="theme-color" content="#000000" />
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<meta
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name="description"
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content="Example of Resize Observer API with React"
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/>
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<!--
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manifest.json provides metadata used when your web app is installed on a
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user's mobile device or desktop. See https://developers.google.com/web/fundamentals/web-app-manifest/
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-->
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<link rel="manifest" href="%PUBLIC_URL%/manifest.json" />
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<!--
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Notice the use of %PUBLIC_URL% in the tags above.
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It will be replaced with the URL of the `public` folder during the build.
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Only files inside the `public` folder can be referenced from the HTML.
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Unlike "/favicon.ico" or "favicon.ico", "%PUBLIC_URL%/favicon.ico" will
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work correctly both with client-side routing and a non-root public URL.
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Learn how to configure a non-root public URL by running `npm run build`.
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-->
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<title>Resize Observer API with React</title>
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</head>
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<body>
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<noscript>You need to enable JavaScript to run this app.</noscript>
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<div id="root"></div>
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<!--
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This HTML file is a template.
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If you open it directly in the browser, you will see an empty page.
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You can add webfonts, meta tags, or analytics to this file.
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The build step will place the bundled scripts into the <body> tag.
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To begin the development, run `npm start` or `yarn start`.
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To create a production bundle, use `npm run build` or `yarn build`.
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-->
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<!-- Fathom - simple website analytics - https://github.com/usefathom/fathom -->
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<script>
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(function(f, a, t, h, o, m) {
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a[h] =
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a[h] ||
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function() {
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(a[h].q = a[h].q || []).push(arguments);
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};
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(o = f.createElement("script")),
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(m = f.getElementsByTagName("script")[0]);
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o.async = 1;
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o.src = t;
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o.id = "fathom-script";
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m.parentNode.insertBefore(o, m);
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})(document, window, "//analytics.sethcorker.com/tracker.js", "fathom");
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fathom("set", "siteId", "QCRKN");
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fathom("trackPageview");
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</script>
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<!-- / Fathom -->
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</body>
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</html>

‎public/manifest.json‎

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{
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"short_name": "Fullscreen",
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"name": "React - Fullscreen",
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"icons": [
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{
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"src": "favicon.ico",
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"sizes": "64x64 32x32 24x24 16x16",
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"type": "image/x-icon"
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}
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],
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"start_url": ".",
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"display": "standalone",
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"theme_color": "#000000",
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"background_color": "#ffffff"
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}

‎public/robots.txt‎

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# https://www.robotstxt.org/robotstxt.html
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User-agent: *

‎src/App.css‎

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.title {
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margin-bottom: 0.1rem;
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margin-top: 0;
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}
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.h1 {
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margin-top: 0.25rem;
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font-size: 1.8rem;
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}

‎src/App.js‎

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import React from "react";
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import Info from "./Info";
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import Citations from "./Citations";
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import Nav from "./Nav";
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import Resources from "./Resources";
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import useResponsiveBreakpoints from "./utils/useResponsiveBreakpoints";
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import "./App.css";
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function App() {
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const targetRef = React.useRef(null);
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const size = useResponsiveBreakpoints(targetRef, [
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{ small: 200 },
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{ medium: 400 },
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{ large: 600 }
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]);
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return (
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<React.Fragment>
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<Nav />
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<div className="row">
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<div className="lg-5 col">
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<div className="paper">
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<Info />
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</div>
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<Resources />
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<Citations />
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</div>
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<div className="lg-7 col">
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<div className="paper">
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<div className="row">
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<div className="col-fill col" style={{ overflow: "hidden" }}>
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Try horizontally resizing the box below and see the media query
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name change between small, medium and large
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<div style={{ overflow: "hidden", width: "100%" }}>
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<div
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ref={targetRef}
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className="border"
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style={{
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backgroundColor: "aliceblue",
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padding: "1rem",
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resize: "horizontal",
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overflow: "hidden",
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maxWidth: "100%",
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minWidth: "4rem"
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}}
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>
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{size}
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</div>
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</div>
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</div>
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</div>
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</div>
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</div>
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</div>
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</React.Fragment>
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);
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}
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export default App;

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