2 files changed, 37 insertions, 19 deletions

diff --git a/src/pages/Timer/Timer.js b/src/pages/Timer/Timer.tsx
index 6020c1b..a890815 100644
--- a/src/pages/Timer/Timer.js
+++ b/src/pages/Timer/Timer.tsx
@@ -7,8 +7,9 @@ import {
   ContentSection,
   SmartList,
 } from 'react-benzin';
+import { User, Solution, RenderPropTypes } from '../../types';
 
-import TimerButton from './TimerButton/TimerButton';
+import TimerButton from './TimerButton';
 import SolutionCard from '../../components/SolutionCard/SolutionCard';
 
 import { Button, makeStyles } from '@material-ui/core';
@@ -23,29 +24,38 @@ const useStyles = makeStyles(theme => ({
   },
 }));
 
-const Timer = ({ user, recentSolutions, setRecentSolutions, setPage }) => {
+
+interface PropTypes {
+  user: User;
+  recentSolutions: Solution[];
+  setRecentSolutions: (newRecentSolutions: Solution[]) => void;
+  setPage: (newPage: string) => void;
+}
+
+
+const Timer: React.FC<PropTypes> = ({ user, recentSolutions, setRecentSolutions, setPage }) => {
   const classes = useStyles();
 
-  const registerResult = result => {
-    const solution = { author_id: user.id, result };
+  const registerResult = (result: string): void => {
+    const solution = { 'author_id': user.id, result };
     post('solutions/', solution).then(response => {
       setRecentSolutions([response.data].concat(recentSolutions));
     });
   };
 
-  const handleLearnMore = () => {
+  const handleLearnMore = (): void => {
     setPage('contribute');
   };
 
-  const handleLogin = () => {
+  const handleLogin = (): void => {
     setPage('profile');
   };
 
-  const removeSolution = (id) => {
+  const removeSolution = (id: number): void => {
     setRecentSolutions(recentSolutions.filter((solution => solution.id !== id)));
   };
 
-  const renderItem = ({ index, style }) => {
+  const renderItem: React.FC<RenderPropTypes> = ({ index, style }) => {
     const solution = recentSolutions[index];
     return (
       <div style={style} className={classes.cell}>
diff --git a/src/pages/Timer/TimerButton/TimerButton.js b/src/pages/Timer/TimerButton.tsx
index fdb6b7c..0a3bf38 100644
--- a/src/pages/Timer/TimerButton/TimerButton.js
+++ b/src/pages/Timer/TimerButton.tsx
@@ -12,13 +12,21 @@ const useStyles = makeStyles(theme => ({
   },
 }));
 
-const TimerButton = ({ registerResult }) => {
+
+interface PropTypes {
+  registerResult: (result: string) => void;
+}
+
+type Mode = 'idle' | 'countdown' | 'running' | 'over';
+
+
+const TimerButton: React.FC<PropTypes> = ({ registerResult }) => {
   const classes = useStyles();
 
   const SPACE = 32;
   const maxCountdown = 15000;
-  const [time, setTime] = useState('00:00:00');
-  const [mode, setMode] = useState('idle');
+  const [time, setTime] = useState<string>('00:00:00');
+  const [mode, setMode] = useState<Mode>('idle');
 
   useEffect(()=> {
     const timestamp = Date.now();
@@ -29,14 +37,14 @@ const TimerButton = ({ registerResult }) => {
         if (timeDelta <= 0) setMode('over');
         setTime(convertTimeToString(timeDelta));
       }, 10);
-      return () => clearInterval(repeater);
+      return (): void => clearInterval(repeater);
     }
 
     if (mode === 'running') {
       const repeater = setInterval(() => {
         setTime(convertTimeToString(Date.now() - timestamp));
       }, 10);
-      return () => clearInterval(repeater);
+      return (): void => clearInterval(repeater);
     }
 
     if (mode === 'over') {
@@ -44,12 +52,12 @@ const TimerButton = ({ registerResult }) => {
     }
   }, [mode]);
 
-  const handleKeyPress = event => {
+  const handleKeyPress = (event: KeyboardEvent): void => {
     event.preventDefault();
     if (event.keyCode === SPACE && mode === 'idle' ) setMode('countdown');
   };
 
-  const handleKeyUp = event => {
+  const handleKeyUp = (event: KeyboardEvent): void => {
     if (event.keyCode === SPACE) {
       if (mode === 'running') {
         registerResult(time);
@@ -66,13 +74,13 @@ const TimerButton = ({ registerResult }) => {
     window.addEventListener('keyup', handleKeyUp);
     window.addEventListener('keypress', handleKeyPress);
 
-    return () => {
+    return (): void => {
       window.removeEventListener('keyup', handleKeyUp);
       window.removeEventListener('keypress', handleKeyPress);
     };
   });
 
-  const composeHelperText = () => {
+  const composeHelperText = (): string => {
     switch (mode) {
       case 'running': return 'Go fast!';
       case 'countdown': return 'Release SPACE to begin';
@@ -81,7 +89,7 @@ const TimerButton = ({ registerResult }) => {
     }
   };
 
-  const helperColor = () => {
+  const helperColor = (): 'primary' | 'secondary' | 'textSecondary' => {
     switch (mode) {
       case 'running': return 'primary';
       case 'over': return 'secondary';
@@ -99,7 +107,7 @@ const TimerButton = ({ registerResult }) => {
   );
 };
 
-const convertTimeToString = timeDelta => {
+const convertTimeToString = (timeDelta: number): string => {
   let resultTime = '';
 
   const minute = Math.floor(timeDelta / 60000);