Better printing of unknown errors in requests.

the-draupnir-project/Draupnir#733.

Author: Gnuxie

src/Client/BotSDKBaseClient.ts

@@ -47,6 +47,7 @@ import {
 } from '@the-draupnir-project/matrix-basic-types';
 import { resolveRoomReferenceSafe } from '../SafeMatrixClient';
 import { ResultError } from '@gnuxie/typescript-result';
+import util from 'util';
 
 const log = new Logger('BotSDKBaseClient');
 
@@ -80,10 +81,26 @@ function actionExceptionFromWeakError(
 }
 
 function unknownError(error: unknown): never {
+  const printedError = (() => {
+    if (typeof error === 'object' && error !== null) {
+      // eslint-disable-next-line @typescript-eslint/no-base-to-string
+      const toString = error.toString();
+      if (toString !== '[object Object]') {
+        return toString;
+      }
+    }
+    try {
+      return JSON.stringify(error);
+    } catch {
+      return util.inspect(error, {
+        depth: 2,
+        maxArrayLength: 10,
+        breakLength: 80,
+      });
+    }
+  })();
   throw new TypeError(
-    // Not sure what to do yet other than throw?
-    // eslint-disable-next-line @typescript-eslint/restrict-template-expressions
-    `What on earth are you throwing exactly? because it isn't an error ${error}`
+    `What on earth are you throwing exactly? because it isn't an error: ${printedError}`
   );
 }