Make compile with new version of NodeJS

dev/src/backoff.ts

@@ -58,8 +58,7 @@ export const MAX_RETRY_ATTEMPTS = 10;
 /*!
  * The timeout handler used by `ExponentialBackoff` and `BulkWriter`.
  */
-export let delayExecution: (f: () => void, ms: number) => NodeJS.Timeout =
-  setTimeout;
+export let delayExecution: (f: () => void, ms: number) => void = setTimeout;
 
 /**
  * Allows overriding of the timeout handler used by the exponential backoff
@@ -74,27 +73,7 @@ export let delayExecution: (f: () => void, ms: number) => NodeJS.Timeout =
 export function setTimeoutHandler(
   handler: (f: () => void, ms: number) => void
 ): void {
-  delayExecution = (f: () => void, ms: number) => {
-    handler(f, ms);
-    const timeout: NodeJS.Timeout = {
-      hasRef: () => {
-        throw new Error('For tests only. Not Implemented');
-      },
-      ref: () => {
-        throw new Error('For tests only. Not Implemented');
-      },
-      refresh: () => {
-        throw new Error('For tests only. Not Implemented');
-      },
-      unref: () => {
-        throw new Error('For tests only. Not Implemented');
-      },
-      [Symbol.toPrimitive]: () => {
-        throw new Error('For tests only. Not Implemented');
-      },
-    };
-    return timeout;
-  };
+  delayExecution = handler;
 }
 
 /**