Getting ready for WebRTC

node_modules/socket.io-client/build/esm/contrib/backo2.js

@@ -0,0 +1,66 @@
+/**
+ * Initialize backoff timer with `opts`.
+ *
+ * - `min` initial timeout in milliseconds [100]
+ * - `max` max timeout [10000]
+ * - `jitter` [0]
+ * - `factor` [2]
+ *
+ * @param {Object} opts
+ * @api public
+ */
+export function Backoff(opts) {
+    opts = opts || {};
+    this.ms = opts.min || 100;
+    this.max = opts.max || 10000;
+    this.factor = opts.factor || 2;
+    this.jitter = opts.jitter > 0 && opts.jitter <= 1 ? opts.jitter : 0;
+    this.attempts = 0;
+}
+/**
+ * Return the backoff duration.
+ *
+ * @return {Number}
+ * @api public
+ */
+Backoff.prototype.duration = function () {
+    var ms = this.ms * Math.pow(this.factor, this.attempts++);
+    if (this.jitter) {
+        var rand = Math.random();
+        var deviation = Math.floor(rand * this.jitter * ms);
+        ms = (Math.floor(rand * 10) & 1) == 0 ? ms - deviation : ms + deviation;
+    }
+    return Math.min(ms, this.max) | 0;
+};
+/**
+ * Reset the number of attempts.
+ *
+ * @api public
+ */
+Backoff.prototype.reset = function () {
+    this.attempts = 0;
+};
+/**
+ * Set the minimum duration
+ *
+ * @api public
+ */
+Backoff.prototype.setMin = function (min) {
+    this.ms = min;
+};
+/**
+ * Set the maximum duration
+ *
+ * @api public
+ */
+Backoff.prototype.setMax = function (max) {
+    this.max = max;
+};
+/**
+ * Set the jitter
+ *
+ * @api public
+ */
+Backoff.prototype.setJitter = function (jitter) {
+    this.jitter = jitter;
+};