Initial project bootstrap

client/src/hooks/useComposition.ts

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+import { useRef } from "react";
+import { usePersistFn } from "./usePersistFn";
+
+export interface UseCompositionReturn<
+  T extends HTMLInputElement | HTMLTextAreaElement,
+> {
+  onCompositionStart: React.CompositionEventHandler<T>;
+  onCompositionEnd: React.CompositionEventHandler<T>;
+  onKeyDown: React.KeyboardEventHandler<T>;
+  isComposing: () => boolean;
+}
+
+export interface UseCompositionOptions<
+  T extends HTMLInputElement | HTMLTextAreaElement,
+> {
+  onKeyDown?: React.KeyboardEventHandler<T>;
+  onCompositionStart?: React.CompositionEventHandler<T>;
+  onCompositionEnd?: React.CompositionEventHandler<T>;
+}
+
+type TimerResponse = ReturnType<typeof setTimeout>;
+
+export function useComposition<
+  T extends HTMLInputElement | HTMLTextAreaElement = HTMLInputElement,
+>(options: UseCompositionOptions<T> = {}): UseCompositionReturn<T> {
+  const {
+    onKeyDown: originalOnKeyDown,
+    onCompositionStart: originalOnCompositionStart,
+    onCompositionEnd: originalOnCompositionEnd,
+  } = options;
+
+  const c = useRef(false);
+  const timer = useRef<TimerResponse | null>(null);
+  const timer2 = useRef<TimerResponse | null>(null);
+
+  const onCompositionStart = usePersistFn((e: React.CompositionEvent<T>) => {
+    if (timer.current) {
+      clearTimeout(timer.current);
+      timer.current = null;
+    }
+    if (timer2.current) {
+      clearTimeout(timer2.current);
+      timer2.current = null;
+    }
+    c.current = true;
+    originalOnCompositionStart?.(e);
+  });
+
+  const onCompositionEnd = usePersistFn((e: React.CompositionEvent<T>) => {
+    // 使用两层 setTimeout 来处理 Safari 浏览器中 compositionEnd 先于 onKeyDown 触发的问题
+    timer.current = setTimeout(() => {
+      timer2.current = setTimeout(() => {
+        c.current = false;
+      });
+    });
+    originalOnCompositionEnd?.(e);
+  });
+
+  const onKeyDown = usePersistFn((e: React.KeyboardEvent<T>) => {
+    // 在 composition 状态下，阻止 ESC 和 Enter（非 shift+Enter）事件的冒泡
+    if (
+      c.current &&
+      (e.key === "Escape" || (e.key === "Enter" && !e.shiftKey))
+    ) {
+      e.stopPropagation();
+      return;
+    }
+    originalOnKeyDown?.(e);
+  });
+
+  const isComposing = usePersistFn(() => {
+    return c.current;
+  });
+
+  return {
+    onCompositionStart,
+    onCompositionEnd,
+    onKeyDown,
+    isComposing,
+  };
+}

client/src/hooks/useMobile.tsx

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+import * as React from "react";
+
+const MOBILE_BREAKPOINT = 768;
+
+export function useIsMobile() {
+  const [isMobile, setIsMobile] = React.useState<boolean | undefined>(
+    undefined
+  );
+
+  React.useEffect(() => {
+    const mql = window.matchMedia(`(max-width: ${MOBILE_BREAKPOINT - 1}px)`);
+    const onChange = () => {
+      setIsMobile(window.innerWidth < MOBILE_BREAKPOINT);
+    };
+    mql.addEventListener("change", onChange);
+    setIsMobile(window.innerWidth < MOBILE_BREAKPOINT);
+    return () => mql.removeEventListener("change", onChange);
+  }, []);
+
+  return !!isMobile;
+}

client/src/hooks/usePersistFn.ts

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+import { useRef } from "react";
+
+type noop = (...args: any[]) => any;
+
+/**
+ * usePersistFn instead of useCallback to reduce cognitive load
+ */
+export function usePersistFn<T extends noop>(fn: T) {
+  const fnRef = useRef<T>(fn);
+  fnRef.current = fn;
+
+  const persistFn = useRef<T>(null);
+  if (!persistFn.current) {
+    persistFn.current = function (this: unknown, ...args) {
+      return fnRef.current!.apply(this, args);
+    } as T;
+  }
+
+  return persistFn.current!;
+}