Add frontend

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

+PORT=38000
\ No newline at end of file

+GENERATE_SOURCEMAP=false
+INLINE_RUNTIME_CHUNK=false
\ No newline at end of file

+{
+  "parser": "@typescript-eslint/parser",
+  "parserOptions": {
+    "project": "tsconfig.json",
+    "sourceType": "module"
+  },
+  "plugins": ["@typescript-eslint/eslint-plugin"],
+  "extends": [
+    "react-app",
+    "eslint:recommended",
+    "plugin:react/recommended",
+    "plugin:jest/recommended",
+    "plugin:@typescript-eslint/eslint-recommended",
+    "plugin:@typescript-eslint/recommended",
+    "prettier",
+    "prettier/@typescript-eslint"
+  ],
+  "rules": {
+    "no-console": "warn",
+    "id-length": "warn",
+    "react/display-name": "off",
+    "react/prop-types": "off",
+    "no-empty": ["warn", { "allowEmptyCatch": true }],
+    "@typescript-eslint/explicit-function-return-type": "off",
+    "@typescript-eslint/explicit-member-accessibility": "off",
+    "@typescript-eslint/interface-name-prefix": "off",
+    "@typescript-eslint/no-explicit-any": "off",
+    "@typescript-eslint/no-inferrable-types": "off",
+    "@typescript-eslint/no-non-null-assertion": "warn",
+    "@typescript-eslint/no-empty-function": "off"
+  },
+  "overrides": [
+    {
+      "files": "config-overrides.js",
+      "parser": "espree",
+      "rules": {
+        "@typescript-eslint/no-var-requires": "off"
+      }
+    }
+  ]
+}

+{
+  "quoteProps": "consistent"
+}

+const {
+  override,
+  addBabelPlugin,
+  addBundleVisualizer,
+} = require("customize-cra");
+
+const findSassModuleRule = (config) => {
+  let sassModuleRuleIndex;
+  const loaders = config.module.rules.find((ruleItem) => {
+    if (!ruleItem.oneOf || !ruleItem.oneOf.length) {
+      return false;
+    }
+    sassModuleRuleIndex = ruleItem.oneOf.findIndex(
+      (loaderItem) =>
+        loaderItem.test &&
+        loaderItem.test.toString() === "/\\.module\\.(scss|sass)$/"
+    );
+    return sassModuleRuleIndex !== -1;
+  });
+
+  const sassModuleRule = loaders.oneOf[sassModuleRuleIndex];
+  return sassModuleRule;
+};
+
+const setCssModuleLocalIdentName = (localIdentName) => (config) => {
+  const sassModuleRule = findSassModuleRule(config);
+  const cssLoaderOption = (sassModuleRule.use || sassModuleRule.loader).find(
+    (loaderItem) =>
+      loaderItem.loader && loaderItem.loader.includes("/css-loader/")
+  );
+
+  cssLoaderOption.options.modules = { localIdentName };
+  return config;
+};
+
+const setupReactHotLoader = () => (config) => {
+  config = addBabelPlugin("react-hot-loader/babel")(config);
+  config.entry = ["react-hot-loader/patch", ...config.entry];
+
+  if (!config.resolve.alias) {
+    config.resolve.alias = {};
+  }
+  config.resolve.alias["react-dom"] = "@hot-loader/react-dom";
+
+  return config;
+};
+
+if (process.env.NODE_ENV === "development") {
+  module.exports = override(setupReactHotLoader());
+} else {
+  module.exports = override(
+    setCssModuleLocalIdentName("[hash:base64:5]"),
+    addBundleVisualizer({}, true)
+  );
+}

+{
+  "name": "khudrive",
+  "version": "0.1.0",
+  "description": "Dropbox alternative cloud file service",
+  "private": true,
+  "dependencies": {
+    "classnames": "^2.2.6",
+    "ky": "^0.19.1",
+    "react": "^16.13.1",
+    "react-dom": "^16.13.1",
+    "react-router-dom": "^5.1.2"
+  },
+  "devDependencies": {
+    "@hot-loader/react-dom": "^16.13.0",
+    "@testing-library/jest-dom": "^5.7.0",
+    "@testing-library/react": "^10.0.4",
+    "@testing-library/user-event": "^10.1.2",
+    "@types/classnames": "^2.2.10",
+    "@types/jest": "^25.2.1",
+    "@types/node": "12",
+    "@types/react": "^16.9.35",
+    "@types/react-dom": "^16.9.8",
+    "@types/react-router-dom": "^5.1.5",
+    "@typescript-eslint/eslint-plugin": "^2.31.0",
+    "@typescript-eslint/parser": "^2.31.0",
+    "customize-cra": "0.9.1",
+    "eslint-config-prettier": "^6.11.0",
+    "eslint-plugin-jest": "^23.10.0",
+    "husky": "^4.2.5",
+    "lint-staged": "^10.2.2",
+    "node-sass": "^4.14.1",
+    "prettier": "^2.0.5",
+    "react-app-rewired": "^2.1.6",
+    "react-hot-loader": "^4.12.21",
+    "react-scripts": "3.4.1",
+    "typescript": "^3.8.3",
+    "webpack-bundle-analyzer": "^3.7.0"
+  },
+  "scripts": {
+    "start": "react-app-rewired start",
+    "build": "react-app-rewired build",
+    "analyze": "npm run build -- --analyze",
+    "lint": "eslint --ext js,jsx,ts,tsx src",
+    "prettier": "prettier --write \"src/**/*.{js,ts,tsx,json,css,scss}\"",
+    "test": "react-app-rewired test"
+  },
+  "browserslist": {
+    "production": [
+      ">0.2%",
+      "not dead",
+      "not op_mini all"
+    ],
+    "development": [
+      "last 1 chrome version",
+      "last 1 firefox version",
+      "last 1 safari version"
+    ]
+  },
+  "husky": {
+    "hooks": {
+      "pre-commit": "lint-staged"
+    }
+  },
+  "lint-staged": {
+    "*.{js,ts,tsx,json,css,scss}": "prettier --write"
+  }
+}

+<!DOCTYPE html>
+<html lang="en">
+  <head>
+    <meta charset="utf-8" />
+    <link rel="icon" href="%PUBLIC_URL%/favicon.ico" />
+    <meta name="viewport" content="width=device-width, initial-scale=1" />
+    <meta name="theme-color" content="#000000" />
+    <meta
+      name="description"
+      content="Web site created using create-react-app"
+    />
+    <link rel="apple-touch-icon" href="%PUBLIC_URL%/logo192.png" />
+    <!--
+      manifest.json provides metadata used when your web app is installed on a
+      user's mobile device or desktop. See https://developers.google.com/web/fundamentals/web-app-manifest/
+    -->
+    <link rel="manifest" href="%PUBLIC_URL%/manifest.json" />
+    <!--
+      Notice the use of %PUBLIC_URL% in the tags above.
+      It will be replaced with the URL of the `public` folder during the build.
+      Only files inside the `public` folder can be referenced from the HTML.
+
+      Unlike "/favicon.ico" or "favicon.ico", "%PUBLIC_URL%/favicon.ico" will
+      work correctly both with client-side routing and a non-root public URL.
+      Learn how to configure a non-root public URL by running `npm run build`.
+    -->
+    <title>React App</title>
+  </head>
+  <body>
+    <noscript>You need to enable JavaScript to run this app.</noscript>
+    <div id="root"></div>
+    <!--
+      This HTML file is a template.
+      If you open it directly in the browser, you will see an empty page.
+
+      You can add webfonts, meta tags, or analytics to this file.
+      The build step will place the bundled scripts into the <body> tag.
+
+      To begin the development, run `npm start` or `yarn start`.
+      To create a production bundle, use `npm run build` or `yarn build`.
+    -->
+  </body>
+</html>

+{
+  "short_name": "React App",
+  "name": "Create React App Sample",
+  "icons": [
+    {
+      "src": "favicon.ico",
+      "sizes": "64x64 32x32 24x24 16x16",
+      "type": "image/x-icon"
+    },
+    {
+      "src": "logo192.png",
+      "type": "image/png",
+      "sizes": "192x192"
+    },
+    {
+      "src": "logo512.png",
+      "type": "image/png",
+      "sizes": "512x512"
+    }
+  ],
+  "start_url": ".",
+  "display": "standalone",
+  "theme_color": "#000000",
+  "background_color": "#ffffff"
+}

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

+import React from "react";
+
+export function App() {
+  return <div>Hello World!</div>;
+}

+body {
+  margin: 0;
+  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", "Roboto", "Oxygen",
+    "Ubuntu", "Cantarell", "Fira Sans", "Droid Sans", "Helvetica Neue",
+    sans-serif;
+  -webkit-font-smoothing: antialiased;
+  -moz-osx-font-smoothing: grayscale;
+}
+
+code {
+  font-family: source-code-pro, Menlo, Monaco, Consolas, "Courier New",
+    monospace;
+}

+import React from "react";
+import ReactDOM from "react-dom";
+
+import "./index.css";
+
+import { App } from "./App";
+
+import * as serviceWorker from "./serviceWorker";
+
+ReactDOM.render(
+  <React.StrictMode>
+    <App />
+  </React.StrictMode>,
+  document.getElementById("root")
+);
+
+// If you want your app to work offline and load faster, you can change
+// unregister() to register() below. Note this comes with some pitfalls.
+// Learn more about service workers: https://bit.ly/CRA-PWA
+serviceWorker.unregister();

+/// <reference types="react-scripts" />

+// This optional code is used to register a service worker.
+// register() is not called by default.
+
+// This lets the app load faster on subsequent visits in production, and gives
+// it offline capabilities. However, it also means that developers (and users)
+// will only see deployed updates on subsequent visits to a page, after all the
+// existing tabs open on the page have been closed, since previously cached
+// resources are updated in the background.
+
+// To learn more about the benefits of this model and instructions on how to
+// opt-in, read https://bit.ly/CRA-PWA
+
+const isLocalhost = Boolean(
+  window.location.hostname === "localhost" ||
+    // [::1] is the IPv6 localhost address.
+    window.location.hostname === "[::1]" ||
+    // 127.0.0.0/8 are considered localhost for IPv4.
+    window.location.hostname.match(
+      /^127(?:\.(?:25[0-5]|2[0-4][0-9]|[01]?[0-9][0-9]?)){3}$/
+    )
+);
+
+type Config = {
+  onSuccess?: (registration: ServiceWorkerRegistration) => void;
+  onUpdate?: (registration: ServiceWorkerRegistration) => void;
+};
+
+export function register(config?: Config) {
+  if (process.env.NODE_ENV === "production" && "serviceWorker" in navigator) {
+    // The URL constructor is available in all browsers that support SW.
+    const publicUrl = new URL(process.env.PUBLIC_URL, window.location.href);
+    if (publicUrl.origin !== window.location.origin) {
+      // Our service worker won't work if PUBLIC_URL is on a different origin
+      // from what our page is served on. This might happen if a CDN is used to
+      // serve assets; see https://github.com/facebook/create-react-app/issues/2374
+      return;
+    }
+
+    window.addEventListener("load", () => {
+      const swUrl = `${process.env.PUBLIC_URL}/service-worker.js`;
+
+      if (isLocalhost) {
+        // This is running on localhost. Let's check if a service worker still exists or not.
+        checkValidServiceWorker(swUrl, config);
+
+        // Add some additional logging to localhost, pointing developers to the
+        // service worker/PWA documentation.
+        navigator.serviceWorker.ready.then(() => {
+          console.log(
+            "This web app is being served cache-first by a service " +
+              "worker. To learn more, visit https://bit.ly/CRA-PWA"
+          );
+        });
+      } else {
+        // Is not localhost. Just register service worker
+        registerValidSW(swUrl, config);
+      }
+    });
+  }
+}
+
+function registerValidSW(swUrl: string, config?: Config) {
+  navigator.serviceWorker
+    .register(swUrl)
+    .then((registration) => {
+      registration.onupdatefound = () => {
+        const installingWorker = registration.installing;
+        if (installingWorker == null) {
+          return;
+        }
+        installingWorker.onstatechange = () => {
+          if (installingWorker.state === "installed") {
+            if (navigator.serviceWorker.controller) {
+              // At this point, the updated precached content has been fetched,
+              // but the previous service worker will still serve the older
+              // content until all client tabs are closed.
+              console.log(
+                "New content is available and will be used when all " +
+                  "tabs for this page are closed. See https://bit.ly/CRA-PWA."
+              );
+
+              // Execute callback
+              if (config && config.onUpdate) {
+                config.onUpdate(registration);
+              }
+            } else {
+              // At this point, everything has been precached.
+              // It's the perfect time to display a
+              // "Content is cached for offline use." message.
+              console.log("Content is cached for offline use.");
+
+              // Execute callback
+              if (config && config.onSuccess) {
+                config.onSuccess(registration);
+              }
+            }
+          }
+        };
+      };
+    })
+    .catch((error) => {
+      console.error("Error during service worker registration:", error);
+    });
+}
+
+function checkValidServiceWorker(swUrl: string, config?: Config) {
+  // Check if the service worker can be found. If it can't reload the page.
+  fetch(swUrl, {
+    headers: { "Service-Worker": "script" },
+  })
+    .then((response) => {
+      // Ensure service worker exists, and that we really are getting a JS file.
+      const contentType = response.headers.get("content-type");
+      if (
+        response.status === 404 ||
+        (contentType != null && contentType.indexOf("javascript") === -1)
+      ) {
+        // No service worker found. Probably a different app. Reload the page.
+        navigator.serviceWorker.ready.then((registration) => {
+          registration.unregister().then(() => {
+            window.location.reload();
+          });
+        });
+      } else {
+        // Service worker found. Proceed as normal.
+        registerValidSW(swUrl, config);
+      }
+    })
+    .catch(() => {
+      console.log(
+        "No internet connection found. App is running in offline mode."
+      );
+    });
+}
+
+export function unregister() {
+  if ("serviceWorker" in navigator) {
+    navigator.serviceWorker.ready
+      .then((registration) => {
+        registration.unregister();
+      })
+      .catch((error) => {
+        console.error(error.message);
+      });
+  }
+}

+// jest-dom adds custom jest matchers for asserting on DOM nodes.
+// allows you to do things like:
+// expect(element).toHaveTextContent(/react/i)
+// learn more: https://github.com/testing-library/jest-dom
+import "@testing-library/jest-dom/extend-expect";

+{
+  "compilerOptions": {
+    "target": "es5",
+    "module": "esnext",
+    "lib": ["dom", "dom.iterable", "esnext"],
+    "baseUrl": "src",
+    "allowJs": false,
+    "jsx": "preserve",
+    "noEmit": true,
+    "isolatedModules": true,
+    "forceConsistentCasingInFileNames": true,
+    "strict": true,
+    "skipLibCheck": false,
+    "moduleResolution": "node",
+    "allowSyntheticDefaultImports": true,
+    "esModuleInterop": true,
+    "downlevelIteration": true,
+    "importHelpers": true,
+    "resolveJsonModule": true
+  },
+  "include": ["src"]
+}