完成40%

utils/auth-sms-cooldown.js

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+const DEFAULT_COOLDOWN_SECONDS = 60;
+const sceneExpiresAt = new Map();
+
+const requireFunction = (value, name) => {
+  if (typeof value !== "function") {
+    throw new TypeError(`${name} must be a function`);
+  }
+  return value;
+};
+
+export const createAuthSmsCooldown = ({
+  sceneCode,
+  onChange,
+  now = Date.now,
+  setIntervalFn = setInterval,
+  clearIntervalFn = clearInterval,
+}) => {
+  if (typeof sceneCode !== "string" || !sceneCode.trim()) {
+    throw new TypeError("sceneCode must be a non-empty string");
+  }
+  const normalizedSceneCode = sceneCode.trim();
+  const publish = requireFunction(onChange, "onChange");
+  const readNow = requireFunction(now, "now");
+  const scheduleInterval = requireFunction(setIntervalFn, "setIntervalFn");
+  const cancelInterval = requireFunction(clearIntervalFn, "clearIntervalFn");
+  let timer = null;
+
+  const stopTimer = () => {
+    if (timer === null) return;
+    cancelInterval(timer);
+    timer = null;
+  };
+
+  const sync = () => {
+    const expiresAt = sceneExpiresAt.get(normalizedSceneCode) || 0;
+    const remaining = Math.max(
+      0,
+      Math.ceil((expiresAt - Number(readNow())) / 1000),
+    );
+    if (remaining === 0) {
+      sceneExpiresAt.delete(normalizedSceneCode);
+      stopTimer();
+    } else if (timer === null) {
+      timer = scheduleInterval(sync, 1000);
+    }
+    publish(remaining);
+    return remaining;
+  };
+
+  const start = (seconds = DEFAULT_COOLDOWN_SECONDS) => {
+    if (!Number.isInteger(seconds) || seconds < 1 || seconds > 300) {
+      throw new TypeError("cooldown seconds must be an integer from 1 to 300");
+    }
+    sceneExpiresAt.set(
+      normalizedSceneCode,
+      Number(readNow()) + seconds * 1000,
+    );
+    return sync();
+  };
+
+  return Object.freeze({
+    start,
+    sync,
+    dispose: stopTimer,
+  });
+};