fix: Add TimeoutError. (#428)

Author: yusinto

packages/shared/common/src/errors.ts

@@ -43,6 +43,13 @@ export class LDClientError extends Error {
   }
 }
 
+export class LDTimeoutError extends Error {
+  constructor(message: string) {
+    super(message);
+    this.name = 'LaunchDarklyTimeoutError';
+  }
+}
+
 /**
  * Check if the HTTP error is recoverable. This will return false if a request
  * made with any payload could not recover. If the reason for the failure

packages/shared/common/src/utils/timedPromise.ts

@@ -1,3 +1,5 @@
+import { LDTimeoutError } from '../errors';
+
 /**
  * Returns a promise which errors after t seconds.
  *
@@ -8,7 +10,7 @@ const timedPromise = (t: number, taskName: string) =>
   new Promise<void>((_res, reject) => {
     setTimeout(() => {
       const e = `${taskName} timed out after ${t} seconds.`;
-      reject(new Error(e));
+      reject(new LDTimeoutError(e));
     }, t * 1000);
   });