[Backoff] Rewrite to clean up a lot

src/utils/Backoff.js

@@ -1,34 +1,18 @@
 module.exports = class Backoff { // Internal library / utility for a class to retry a callback with delays, etc.
-  constructor(min = 500, max = null) {
-    this._timeoutId = null; // Setup internal vars
-    this.fails = 0;
-
-    this.min = min; // Setup args
-    this.max = max ?? (min * 10);
-
-    this.current = min;
-  }
-
-  get pending() { // If timeout currently set / waiting
-    return this._timeoutId !== null;
-  }
-
-  succeed() { // Reset state on succeed
-    this.current = this.min;
-    this.fails = 0;
-
-    this.cancel();
+  constructor(min = 500, max = (min * 10)) {
+    Object.assign(this, { min, max });
+    this.reset();
+    
+    this.pending = () => this._timeoutId != null; // If timeout currently set / waiting
   }
 
   fail(callback) { // On fail, wait and callback
-    const delay = this.current * 2;
+    this.current = Math.min(this.current + (this.current * 2), this.max);
 
-    this.current = Math.min(this.current + delay, this.max);
-
-    this.fails += 1; // Bump fails
+    this.fails++; // Bump fails
 
     if (!callback) return this.current; // No callback given, skip rest of this
-    if (this._timeoutId !== null) throw new Error('Callback already pending call'); // Timeout already set as waiting for another callback to call, throw error
+    if (this._timeoutId != null) throw new Error(); // Timeout already set as waiting for another callback to call, throw error
 
     this._timeoutId = setTimeout(() => { // Set new timeout
       try {
@@ -41,10 +25,17 @@ module.exports = class Backoff { // Internal library / utility for a class to re
     return this.current;
   }
 
-  cancel() { // Cancel current timeout
-    if (this._timeoutId === null) return; // If no timeout already, do nothing
+  succeed() { // Reset and cancel
+    this.reset();
+    this.cancel();
+  }
 
-    clearTimeout(this._timeoutId); // Stop timeout
-    this_timeoutId = null; // Stop tracking timeout internally as it's been executed
+  cancel() { // Cancel current timeout
+    this._timeoutId = clearTimeout(this._timeoutId); // Stop timeout
+  }
+
+  reset() { // Reset internal state
+    this.current = this.min;
+    this.fails = 0;
   }
 };