add type hints

public/manifest.json

@@ -1,21 +1,11 @@
 {
-  "short_name": "React App",
-  "name": "Create React App Sample",
+  "short_name": "crosski",
+  "name": "Play crosski online!",
   "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": ".",

src/components/App/App.tsx

@@ -5,7 +5,7 @@ import Board from '../Board/Board';
 
 import './App.css';
 
-function App() {
+export default function App(): JSX.Element {
   return (
     <div className="App">
       <Logo />
@@ -13,5 +13,3 @@ function App() {
     </div>
   );
 }
-
-export default App;

src/components/Board/Board.css

@@ -13,8 +13,8 @@
   font-size: larger;
   padding: 20px;
   background: ghostwhite;
-  border-radius: 25px;
-  border-color: #E5E5EA;
+  border-radius: 1rem;
+  border-color: #e5e5ea;
   color: brown;
   cursor: pointer;
 }

src/components/Board/Board.tsx

@@ -1,8 +1,13 @@
-import React, { Component } from 'react';
+import React from 'react';
+import PropTypes from 'prop-types';
 
 import './Board.css';
 
-class Board extends Component {
+export default class Board extends React.Component {
+
+  static propTypes = {
+    clickHandler: PropTypes.func,
+  };
 
   genSquares() {
     let squares = [];
@@ -22,12 +27,12 @@ class Board extends Component {
     return squares;
   }
 
-  onMouseDown() {
-    console.log("down")
+  onMouseMove() {
+    return 1;
   }
 
-  onMouseMove() {
-    console.log("move")
+  onMouseDown() {
+    return 1;
   }
 
   render() {
@@ -42,5 +47,3 @@ class Board extends Component {
     );
   }
 }
-
-export default Board;

src/components/Logo/Logo.tsx

@@ -3,12 +3,10 @@ import React from 'react';
 import Wide from './crosski_wide.svg'
 import './Logo.css';
 
-function Logo() {
+export default function Logo(): JSX.Element {
   return (
     <div className="Logo">
       <img alt="Logo" src={Wide} className="Logo-wide"/>
     </div>
   );
 }
-
-export default Logo;

tsconfig.json

@@ -12,7 +12,6 @@
     "allowSyntheticDefaultImports": true,
     "strict": true,
     "forceConsistentCasingInFileNames": true,
-    "noFallthroughCasesInSwitch": true,
     "module": "esnext",
     "moduleResolution": "node",
     "resolveJsonModule": true,
@@ -23,6 +22,7 @@
     "declaration": true,
     "noUnusedLocals": true,
     "noUnusedParameters": true,
+    "noFallthroughCasesInSwitch": true,
     "incremental": true
   },
   "include": [