add basic frontend

frontend/.gitignore

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+node_modules
+/build
+/*.log

frontend/README.md

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+# Imagur
+
+## CLI Commands
+*   `npm install`: Installs dependencies
+
+*   `npm run dev`: Run a development, HMR server
+
+*   `npm run serve`: Run a production-like server
+
+*   `npm run build`: Production-ready build
+
+*   `npm run lint`: Pass TypeScript files using ESLint
+
+*   `npm run test`: Run Jest and Enzyme with
+    [`enzyme-adapter-preact-pure`](https://github.com/preactjs/enzyme-adapter-preact-pure) for
+    your tests
+
+
+For detailed explanation on how things work, checkout the [CLI Readme](https://github.com/developit/preact-cli/blob/master/README.md).

frontend/package.json

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+{
+  "private": true,
+  "name": "imagur-frontend",
+  "version": "1.0.0",
+  "license": "GPL-3.0",
+  "scripts": {
+    "build": "preact build",
+    "serve": "sirv build --port 8080 --cors --single",
+    "dev": "preact watch",
+    "lint": "eslint 'src/**/*.{js,jsx,ts,tsx}'"
+  },
+  "eslintConfig": {
+    "parser": "@typescript-eslint/parser",
+    "extends": [
+      "preact",
+      "plugin:@typescript-eslint/recommended"
+    ],
+    "ignorePatterns": [
+      "build/"
+    ]
+  },
+  "dependencies": {
+    "preact": "^10.6.6",
+    "preact-render-to-string": "^5.1.20",
+    "preact-router": "^4.0.1"
+  },
+  "devDependencies": {
+    "@types/enzyme": "^3.10.11",
+    "@typescript-eslint/eslint-plugin": "^5.12.1",
+    "@typescript-eslint/parser": "^5.12.1",
+    "enzyme": "^3.11.0",
+    "enzyme-adapter-preact-pure": "^3.3.0",
+    "eslint": "^8.9.0",
+    "eslint-config-preact": "^1.3.0",
+    "preact-cli": "^3.3.5",
+    "sass": "^1.49.8",
+    "sass-loader": "10",
+    "sirv-cli": "^2.0.2",
+    "typescript": "^4.5.5",
+    "webpack": "5"
+  }
+}

frontend/src/.babelrc

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+{
+    "presets": [ 
+        "preact-cli/babel"
+    ]
+}

frontend/src/components/app.tsx

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+import { FunctionalComponent, h } from 'preact';
+import { Route, Router } from 'preact-router';
+
+import Home from '../routes/home';
+import NotFoundPage from '../routes/notfound';
+import Header from './header';
+
+const App: FunctionalComponent = () => {
+    return (
+        <div id="preact_root">
+            <Header />
+            <Router>
+                <Route path="/" component={Home} />
+                <NotFoundPage default />
+            </Router>
+        </div>
+    );
+};
+
+export default App;

frontend/src/components/header/index.tsx

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+import { FunctionalComponent, h } from 'preact';
+import { Link } from 'preact-router/match';
+import style from './style.css';
+
+const Header: FunctionalComponent = () => {
+    return (
+        <header class={style.header}>
+            <h1>Preact App</h1>
+            <nav>
+                <Link activeClassName={style.active} href="/">
+                    Home
+                </Link>
+                <Link activeClassName={style.active} href="/profile">
+                    Me
+                </Link>
+                <Link activeClassName={style.active} href="/profile/john">
+                    John
+                </Link>
+            </nav>
+        </header>
+    );
+};
+
+export default Header;

frontend/src/components/header/style.css

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+.header {
+	position: fixed;
+	left: 0;
+	top: 0;
+	width: 100%;
+	height: 56px;
+	padding: 0;
+	background: #673AB7;
+	box-shadow: 0 0 5px rgba(0, 0, 0, 0.5);
+	z-index: 50;
+}
+
+.header h1 {
+	float: left;
+	margin: 0;
+	padding: 0 15px;
+	font-size: 24px;
+	line-height: 56px;
+	font-weight: 400;
+	color: #FFF;
+}
+
+.header nav {
+	float: right;
+	font-size: 100%;
+}
+
+.header nav a {
+	display: inline-block;
+	height: 56px;
+	line-height: 56px;
+	padding: 0 15px;
+	min-width: 50px;
+	text-align: center;
+	background: rgba(255,255,255,0);
+	text-decoration: none;
+	color: #FFF;
+	will-change: background-color;
+}
+
+.header nav a:hover,
+.header nav a:active {
+	background: rgba(0,0,0,0.2);
+}
+
+.header nav a.active {
+	background: rgba(0,0,0,0.4);
+}

frontend/src/declaration.d.ts

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+declare module "*.css" {
+    const mapping: Record<string, string>;
+    export default mapping;
+}

frontend/src/index.ts

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+import './style/index.scss';
+import App from './components/app';
+
+export default App;

frontend/src/manifest.json

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+{
+  "name": "Imagur",
+  "short_name": "Imagur",
+  "start_url": "/",
+  "display": "standalone",
+  "orientation": "portrait"
+}

frontend/src/routes/home/index.tsx

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+import { FunctionalComponent, h } from 'preact';
+import style from './style.css';
+
+const Home: FunctionalComponent = () => {
+    return (
+        <div class={style.home}>
+            <h1>Home</h1>
+            <p>This is the Home component.</p>
+        </div>
+    );
+};
+
+export default Home;

frontend/src/routes/home/style.css

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+.home {
+	padding: 56px 20px;
+	min-height: 100%;
+	width: 100%;
+}

frontend/src/routes/notfound/index.tsx

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+import { FunctionalComponent, h } from 'preact';
+import { Link } from 'preact-router/match';
+import style from './style.css';
+
+const Notfound: FunctionalComponent = () => {
+    return (
+        <div class={style.notfound}>
+            <h1>Error 404</h1>
+            <p>That page doesn&apos;t exist.</p>
+            <Link href="/">
+                <h4>Back to Home</h4>
+            </Link>
+        </div>
+    );
+};
+
+export default Notfound;

frontend/src/routes/notfound/style.css

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+.notfound {
+    padding: 0 5%;
+    margin: 100px 0;
+}

frontend/src/style/index.scss

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+html, body {
+	height: 100%;
+	width: 100%;
+	padding: 0;
+	margin: 0;
+	background: #FAFAFA;
+	font-family: 'Helvetica Neue', arial, sans-serif;
+	font-weight: 400;
+	color: #444;
+	-webkit-font-smoothing: antialiased;
+	-moz-osx-font-smoothing: grayscale;
+}
+
+* {
+	box-sizing: border-box;
+}
+
+#preact_root {
+	height: 100%;
+}

frontend/src/template.html

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+<!DOCTYPE html>
+<html lang="en">
+  <head>
+    <meta charset="utf-8" />
+    <title><% preact.title %></title>
+    <meta name="viewport" content="width=device-width,initial-scale=1" />
+    <meta name="Author" content="Rubikscraft" />
+
+    <% preact.headEnd %>
+  </head>
+  <body>
+    <% preact.bodyEnd %>
+  </body>
+</html>

frontend/tsconfig.json

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+{
+    "compilerOptions": {
+        /* Basic Options */
+        "target": "ES5",                          /* Specify ECMAScript target version: 'ES3' (default), 'ES5', 'ES2015', 'ES2016', 'ES2017', or 'ESNEXT'. */
+        "module": "ESNext",                       /* Specify module code generation: 'none', commonjs', 'amd', 'system', 'umd', 'es2015', or 'ESNext'. */
+        // "lib": [],                             /* Specify library files to be included in the compilation:  */
+        "allowJs": true,                          /* Allow javascript files to be compiled. */
+        // "checkJs": true,                       /* Report errors in .js files. */
+        "jsx": "react",                           /* Specify JSX code generation: 'preserve', 'react-native', or 'react'. */
+        "jsxFactory": "h",                        /* Specify the JSX factory function to use when targeting react JSX emit, e.g. React.createElement or h. */
+        "jsxFragmentFactory": "Fragment",         /* Specify the JSX fragment factory function to use when targeting react JSX emit with jsxFactory compiler option is specified, e.g. Fragment. */
+        // "declaration": true,                   /* Generates corresponding '.d.ts' file. */
+        // "sourceMap": true,                     /* Generates corresponding '.map' file. */
+        // "outFile": "./",                       /* Concatenate and emit output to single file. */
+        // "outDir": "./",                        /* Redirect output structure to the directory. */
+        // "rootDir": "./",                       /* Specify the root directory of input files. Use to control the output directory structure with --outDir. */
+        // "removeComments": true,                /* Do not emit comments to output. */
+        "noEmit": true,                           /* Do not emit outputs. */
+        // "importHelpers": true,                 /* Import emit helpers from 'tslib'. */
+        // "downlevelIteration": true,            /* Provide full support for iterables in 'for-of', spread, and destructuring when targeting 'ES5' or 'ES3'. */
+        // "isolatedModules": true,               /* Transpile each file as a separate module (similar to 'ts.transpileModule'). */
+
+        /* Strict Type-Checking Options */
+        "strict": true,                           /* Enable all strict type-checking options. */
+        // "noImplicitAny": true,                 /* Raise error on expressions and declarations with an implied 'any' type. */
+        // "strictNullChecks": true,              /* Enable strict null checks. */
+        // "noImplicitThis": true,                /* Raise error on 'this' expressions with an implied 'any' type. */
+        // "alwaysStrict": true,                  /* Parse in strict mode and emit "use strict" for each source file. */
+
+        /* Additional Checks */
+        // "noUnusedLocals": true,                /* Report errors on unused locals. */
+        // "noUnusedParameters": true,            /* Report errors on unused parameters. */
+        // "noImplicitReturns": true,             /* Report error when not all code paths in function return a value. */
+        // "noFallthroughCasesInSwitch": true,    /* Report errors for fallthrough cases in switch statement. */
+
+        /* Module Resolution Options */
+        "moduleResolution": "node",               /* Specify module resolution strategy: 'node' (Node.js) or 'classic' (TypeScript pre-1.6). */
+        "esModuleInterop": true,                  /* */
+        // "baseUrl": "./",                       /* Base directory to resolve non-absolute module names. */
+        // "paths": {},                           /* A series of entries which re-map imports to lookup locations relative to the 'baseUrl'. */
+        // "rootDirs": [],                        /* List of root folders whose combined content represents the structure of the project at runtime. */
+        // "typeRoots": [],                       /* List of folders to include type definitions from. */
+        // "types": [],                           /* Type declaration files to be included in compilation. */
+        // "allowSyntheticDefaultImports": true,  /* Allow default imports from modules with no default export. This does not affect code emit, just typechecking. */
+        // "preserveSymlinks": true,              /* Do not resolve the real path of symlinks. */
+
+        /* Source Map Options */
+        // "sourceRoot": "./",                    /* Specify the location where debugger should locate TypeScript files instead of source locations. */
+        // "mapRoot": "./",                       /* Specify the location where debugger should locate map files instead of generated locations. */
+        // "inlineSourceMap": true,               /* Emit a single file with source maps instead of having a separate file. */
+        // "inlineSources": true,                 /* Emit the source alongside the sourcemaps within a single file; requires '--inlineSourceMap' or '--sourceMap' to be set. */
+
+        /* Experimental Options */
+        // "experimentalDecorators": true,        /* Enables experimental support for ES7 decorators. */
+        // "emitDecoratorMetadata": true,         /* Enables experimental support for emitting type metadata for decorators. */
+
+        /* Advanced Options */
+        "skipLibCheck": true                      /* Skip type checking of declaration files. */
+    },
+    "include": ["src/**/*", "tests/**/*"]
+}