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node_modules/axios/lib/helpers/throttle.js

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+'use strict';
+
+/**
+ * Throttle decorator
+ * @param {Function} fn
+ * @param {Number} freq
+ * @return {Function}
+ */
+function throttle(fn, freq) {
+  let timestamp = 0;
+  const threshold = 1000 / freq;
+  let timer = null;
+  return function throttled(force, args) {
+    const now = Date.now();
+    if (force || now - timestamp > threshold) {
+      if (timer) {
+        clearTimeout(timer);
+        timer = null;
+      }
+      timestamp = now;
+      return fn.apply(null, args);
+    }
+    if (!timer) {
+      timer = setTimeout(() => {
+        timer = null;
+        timestamp = Date.now();
+        return fn.apply(null, args);
+      }, threshold - (now - timestamp));
+    }
+  };
+}
+
+export default throttle;