Enforce functions (#625)

website/agb/.eslintrc.json

@@ -1,3 +1,6 @@
 {
-  "extends": "next/core-web-vitals"
+  "extends": "next/core-web-vitals",
+  "rules": {
+    "func-style": ["error", "declaration", {"allowArrowFunctions": false}]
+  }
 }

website/agb/src/app/contentBlock.tsx

@@ -32,12 +32,18 @@ const InnerBlock = styled.div<{ $centered?: boolean }>`
   margin-bottom: 40px;
 `;
 
-export const ContentBlock: FC<{
+export function ContentBlock({
+  color = "",
+  children,
+  uncentered = false,
+}: {
   color?: string;
   uncentered?: boolean;
   children: ReactNode;
-}> = ({ color = "", children, uncentered = false }) => (
+}) {
+  return (
     <Section $color={color}>
       <InnerBlock $centered={!uncentered}>{children}</InnerBlock>
     </Section>
   );
+}

website/agb/src/app/crash/backtrace.tsx

@@ -10,9 +10,11 @@ const BacktraceWrapper = styled.section`
   justify-content: center;
 `;
 
-const getBacktrace = () => window.location.hash.slice(1);
+function getBacktrace() {
+  return window.location.hash.slice(1);
+}
 
-export const BacktraceDisplay: FC = () => {
+export function BacktraceDisplay() {
   const backtrace = useClientValue(getBacktrace) ?? "";
 
   return (
@@ -28,4 +30,4 @@ export const BacktraceDisplay: FC = () => {
       </button>
     </BacktraceWrapper>
   );
-};
+}

website/agb/src/app/mgba/Slider.tsx

@@ -34,15 +34,15 @@ export function Slider({
 }) {
   const slider = useRef<HTMLDivElement>(null);
 
-  const handleClick = (event: React.MouseEvent<HTMLDivElement>) => {
+  function handleClick(event: React.MouseEvent<HTMLDivElement>) {
     onChange(
       event.nativeEvent.offsetX / (event.target as HTMLDivElement).offsetWidth
     );
 
     event.stopPropagation();
-  };
+  }
 
-  const handleDrag = (event: React.MouseEvent<HTMLDivElement>) => {
+  function handleDrag(event: React.MouseEvent<HTMLDivElement>) {
     const sliderRef = slider.current;
 
     if (!sliderRef || event.buttons !== 1) {
@@ -56,7 +56,7 @@ export function Slider({
     const clamped = Math.min(1, Math.max(0, proportion));
 
     onChange(clamped);
-  };
+  }
 
   return (
     <SliderWrapper ref={slider} onClick={handleClick} onMouseMove={handleDrag}>

website/agb/src/app/mgba/bindings.tsx

@@ -1,7 +1,7 @@
 import { FC, useState } from "react";
 import styled from "styled-components";
 
-const DefaultBindings = (): KeyBindings => {
+function DefaultBindings(): KeyBindings {
   return {
     A: "Z",
     B: "X",
@@ -14,12 +14,14 @@ const DefaultBindings = (): KeyBindings => {
     Left: "LEFT",
     Right: "RIGHT",
   };
-};
+}
 
-export const DefaultBindingsSet = (): Bindings => ({
+export function DefaultBindingsSet(): Bindings {
+  return {
     Actual: DefaultBindings(),
     Displayed: DefaultBindings(),
-});
+  };
+}
 
 export enum GbaKey {
   A = "A",
@@ -69,18 +71,22 @@ export interface Bindings {
   Actual: KeyBindings;
 }
 
-const toHumanName = (keyName: string) => {
+function toHumanName(keyName: string) {
   return keyName.replace("Arrow", "");
-};
+}
 
-export const BindingsControl: FC<{
+export function BindingsControl({
+  bindings,
+  setBindings,
+  setPaused,
+}: {
   bindings: Bindings;
   setBindings: (a: Bindings) => void;
   setPaused: (pause: boolean) => void;
-}> = ({ bindings, setBindings, setPaused }) => {
+}) {
   const [buttonToChange, setButtonToChange] = useState<GbaKey | null>(null);
 
-  const setKey = (key: string) => {
+  function setKey(key: string) {
     if (buttonToChange === null) return;
 
     const nextBindings = {
@@ -94,12 +100,12 @@ export const BindingsControl: FC<{
     setButtonToChange(null);
     setBindings(nextBindings);
     setPaused(false);
-  };
+  }
 
-  const onSelectButtonClick = (key: GbaKey) => {
+  function onSelectButtonClick(key: GbaKey) {
     setPaused(true);
     setButtonToChange(key);
-  };
+  }
 
   return (
     <ButtonWrapper onKeyUp={(evt: React.KeyboardEvent) => setKey(evt.key)}>
@@ -116,4 +122,4 @@ export const BindingsControl: FC<{
       ))}
     </ButtonWrapper>
   );
-};
+}

website/agb/src/app/mgba/mgba.tsx

@@ -41,7 +41,7 @@ export interface MgbaHandle {
   buttonRelease: (key: GbaKey) => void;
 }
 
-const downloadGame = async (gameUrl: string): Promise<ArrayBuffer> => {
+async function downloadGame(gameUrl: string): Promise<ArrayBuffer> {
   const game = await fetch(gameUrl);
 
   if (gameUrl.endsWith(".gz")) {
@@ -52,7 +52,7 @@ const downloadGame = async (gameUrl: string): Promise<ArrayBuffer> => {
   } else {
     return await game.arrayBuffer();
   }
-};
+}
 
 export const Mgba = forwardRef<MgbaHandle, MgbaProps>(
   ({ gameUrl, volume, controls, paused }, ref) => {

website/agb/src/app/mgba/mgbaWrapper.tsx

@@ -65,11 +65,13 @@ interface MgbaWrapperProps {
   setIsPlaying?: (isPlaying: boolean) => void;
 }
 
-export const MgbaStandalone: FC<MgbaWrapperProps> = (props) => (
+export function MgbaStandalone(props: MgbaWrapperProps) {
+  return (
     <AppContainer>
       <MgbaWrapper {...props} />
     </AppContainer>
   );
+}
 
 export const MgbaWrapper = forwardRef<MgbaHandle, MgbaWrapperProps>(
   ({ gameUrl, isPlaying = true, setIsPlaying }, ref) => {
@@ -80,10 +82,12 @@ export const MgbaWrapper = forwardRef<MgbaHandle, MgbaWrapperProps>(
 
     const [mgbaId, setMgbaId] = useState(0);
 
-    const setVolume = (newVolume: number) =>
-      setState({ volume: newVolume, bindings });
-    const setBindings = (newBindings: Bindings) =>
-      setState({ volume, bindings: newBindings });
+    function setVolume(newVolume: number) {
+      return setState({ volume: newVolume, bindings });
+    }
+    function setBindings(newBindings: Bindings) {
+      return setState({ volume, bindings: newBindings });
+    }
 
     const [paused, setPaused] = useState(false);
 

website/agb/src/app/mgba/useAvoidItchIoScrolling.ts

@@ -1,12 +1,12 @@
 import { useEffect } from "react";
 
-export const useAvoidItchIoScrolling = () => {
+export function useAvoidItchIoScrolling() {
   useEffect(() => {
-    const eventHandler = (e: KeyboardEvent) => {
+    function eventHandler(e: KeyboardEvent) {
       if ([32, 37, 38, 39, 40].indexOf(e.keyCode) > -1) {
         e.preventDefault();
       }
-    };
+    }
 
     window.addEventListener("keydown", eventHandler, false);
 
@@ -14,4 +14,4 @@ export const useAvoidItchIoScrolling = () => {
       window.removeEventListener("keydown", eventHandler, false);
     };
   }, []);
-};
+}

website/agb/src/app/mgba/useFrameSkip.hook.ts

@@ -2,7 +2,7 @@ import { MutableRefObject, useEffect } from "react";
 import { mGBAEmulator } from "./vendor/mgba";
 
 
-export const useFrameSkip = (mgbaModule: MutableRefObject<mGBAEmulator>) => {
+export function useFrameSkip(mgbaModule: MutableRefObject<mGBAEmulator>) {
     useEffect(() => {
         let previous: number | undefined = undefined;
         let stopped = false;
@@ -11,7 +11,7 @@ export const useFrameSkip = (mgbaModule: MutableRefObject<mGBAEmulator>) => {
         let totalTime = 0;
         let paused = false;
 
-        const raf = (time: DOMHighResTimeStamp) => {
+        function raf(time: DOMHighResTimeStamp) {
             if (previous) {
                 const delta = time - previous;
 
@@ -45,7 +45,7 @@ export const useFrameSkip = (mgbaModule: MutableRefObject<mGBAEmulator>) => {
         }
 
         window.requestAnimationFrame(raf);
-        return () => { stopped = true; }
+        return () => { stopped = true; };
     }, [mgbaModule]);
 
 

website/agb/src/app/mgba/useLocalStorage.hook.ts

@@ -1,9 +1,7 @@
 import { useCallback, useState } from "react";
 
-export const useLocalStorage = <T>(
-  defaultValue: T,
-  appName: string
-): [T, (newValue: T) => void] => {
+export function useLocalStorage<T>(defaultValue: T,
+  appName: string): [T, (newValue: T) => void] {
   const [value, setValue] = useState(() => {
     try {
       const storageValue = localStorage.getItem(appName);
@@ -26,4 +24,4 @@ export const useLocalStorage = <T>(
   }, []);
 
   return [value, setStoredValue];
-};
+}

website/agb/src/app/mgba/useOnKeyUp.hook.ts

@@ -1,12 +1,12 @@
 import { useEffect } from "react";
 
-export const useOnKeyUp = (targetKey: string, callback: () => void) => {
+export function useOnKeyUp(targetKey: string, callback: () => void) {
   useEffect(() => {
-    const downHandler = (evnt: KeyboardEvent) => {
+    function downHandler(evnt: KeyboardEvent) {
       if (evnt.key === targetKey) {
         callback();
       }
-    };
+    }
 
     window.addEventListener("keyup", downHandler);
 
@@ -14,4 +14,4 @@ export const useOnKeyUp = (targetKey: string, callback: () => void) => {
       window.removeEventListener("keyup", downHandler);
     };
   }, [callback, targetKey]);
-};
+}

website/agb/src/app/mobileController.tsx

@@ -52,7 +52,7 @@ const MobileControlsRow = styled.div<{
   ${(props) => props.$centered && `justify-content: center;`}
 `;
 
-const useSimpleButton = (mgba: MgbaHandle, button: GbaKey) => {
+function useSimpleButton(mgba: MgbaHandle, button: GbaKey) {
   return useMemo(() => {
     return {
       onTouchStart: () => {
@@ -63,9 +63,9 @@ const useSimpleButton = (mgba: MgbaHandle, button: GbaKey) => {
       },
     };
   }, [button, mgba]);
-};
+}
 
-const relativeTouch = (touch: Touch) => {
+function relativeTouch(touch: Touch) {
   const target = (touch.target as Element).getBoundingClientRect();
 
   const touchPoint = { x: touch.clientX, y: touch.clientY };
@@ -82,15 +82,15 @@ const relativeTouch = (touch: Touch) => {
   };
 
   return relativePosition;
-};
+}
 
-const useDpadTouch = (mgba: MgbaHandle) => {
+function useDpadTouch(mgba: MgbaHandle) {
   const [previouslyPressedButtons, setTouchedButtons] = useState<Set<GbaKey>>(
     new Set()
   );
 
   return useMemo(() => {
-    const updateDpad = (touches: TouchList) => {
+    function updateDpad(touches: TouchList) {
       const currentlyPressed = new Set<GbaKey>();
 
       for (let touch of touches) {
@@ -130,7 +130,7 @@ const useDpadTouch = (mgba: MgbaHandle) => {
       }
 
       setTouchedButtons(currentlyPressed);
-    };
+    }
 
     return {
       onTouchStart: (event: React.TouchEvent) =>
@@ -141,15 +141,15 @@ const useDpadTouch = (mgba: MgbaHandle) => {
         updateDpad(event.nativeEvent.targetTouches),
     };
   }, [mgba, previouslyPressedButtons]);
-};
+}
 
-const useAbTouch = (mgba: MgbaHandle) => {
+function useAbTouch(mgba: MgbaHandle) {
   const [previouslyPressedButtons, setTouchedButtons] = useState<Set<GbaKey>>(
     new Set()
   );
 
   return useMemo(() => {
-    const updateAbButtons = (touches: TouchList) => {
+    function updateAbButtons(touches: TouchList) {
       const currentlyPressed = new Set<GbaKey>();
 
       for (let touch of touches) {
@@ -173,7 +173,7 @@ const useAbTouch = (mgba: MgbaHandle) => {
       }
 
       setTouchedButtons(currentlyPressed);
-    };
+    }
 
     return {
       onTouchStart: (event: React.TouchEvent) =>
@@ -184,9 +184,9 @@ const useAbTouch = (mgba: MgbaHandle) => {
         updateAbButtons(event.nativeEvent.targetTouches),
     };
   }, [mgba, previouslyPressedButtons]);
-};
+}
 
-export const MobileController: FC<{ mgba: MgbaHandle }> = ({ mgba }) => {
+export function MobileController({ mgba }: { mgba: MgbaHandle }) {
   return (
     <MobileControls onContextMenu={(evt) => evt.preventDefault()}>
       <MobileControlsRow $size={MobileControlsSize.Small}>
@@ -226,4 +226,4 @@ export const MobileController: FC<{ mgba: MgbaHandle }> = ({ mgba }) => {
       </MobileControlsRow>
     </MobileControls>
   );
-};
+}

website/agb/src/app/page.tsx

@@ -69,14 +69,16 @@ const ShowOnWideScreen = styled.div`
   }
 `;
 
-const isTouchScreen = () => navigator.maxTouchPoints > 1;
+function isTouchScreen() {
+  return navigator.maxTouchPoints > 1;
+}
 
 function shouldStartPlaying(isTouchScreen: boolean | undefined) {
   if (isTouchScreen === undefined) return false;
   return !isTouchScreen;
 }
 
-const MgbaWithControllerSides = () => {
+function MgbaWithControllerSides() {
   const mgba = useRef<MgbaHandle>(null);
 
   const mgbaHandle = useMemo(
@@ -128,7 +130,7 @@ const MgbaWithControllerSides = () => {
       </ShowOnWideScreen>
     </>
   );
-};
+}
 export default function Home() {
   return (
     <>

website/agb/src/app/useClientValue.hook.ts

@@ -1,6 +1,6 @@
 import { useEffect, useState } from "react";
 
-export const useClientValue = <T,>(fn: () => T) => {
+export function useClientValue<T>(fn: () => T) {
     const [value, setValue] = useState<T>();
     useEffect(() => {
         setValue(fn());