Merge branch 'master' into google-sheets-lite

apps/server/src/utils/throttle.ts

@@ -0,0 +1,32 @@
+/**
+ * Creates a throttled version of the passed function
+ * This function uses a leading algorithm
+ * which means that the function will be executed immediately on first call
+ * @param {Function} cb - function to throttle
+ * @param {number} delay - time (in ms) to throttle
+ * @returns {Function}
+ */
+export function throttle<T extends any[], U>(cb: (...args: T) => U, delay: number) {
+  let shouldWait = false;
+  let waitingArgs;
+  const timeoutFunc = () => {
+    if (waitingArgs == null) {
+      shouldWait = false;
+    } else {
+      cb(...waitingArgs);
+      waitingArgs = null;
+      setTimeout(timeoutFunc, delay);
+    }
+  };
+
+  return (...args: T) => {
+    if (shouldWait) {
+      waitingArgs = args;
+      return;
+    }
+
+    cb(...args);
+    shouldWait = true;
+    setTimeout(timeoutFunc, delay);
+  };
+}