From 6bb5fedc695ea0f46839c5de776eaed94468a1ac Mon Sep 17 00:00:00 2001
From: Mark Tiedemann <www.marktiedemann@gmail.com>
Date: Thu, 19 Nov 2020 12:58:53 +0100
Subject: [PATCH] feat(std/log): Log error stack (#8401)

---
 std/log/logger.ts      |  2 ++
 std/log/logger_test.ts | 10 +++++++++-
 2 files changed, 11 insertions(+), 1 deletion(-)

diff --git a/std/log/logger.ts b/std/log/logger.ts
index c30517c59d..7ef23977a3 100644
--- a/std/log/logger.ts
+++ b/std/log/logger.ts
@@ -131,6 +131,8 @@ export class Logger {
       typeof data === "symbol"
     ) {
       return String(data);
+    } else if (data instanceof Error) {
+      return data.stack!;
     } else if (typeof data === "object") {
       return JSON.stringify(data);
     }
diff --git a/std/log/logger_test.ts b/std/log/logger_test.ts
index 4ab50809f8..b01d1dc5d5 100644
--- a/std/log/logger_test.ts
+++ b/std/log/logger_test.ts
@@ -1,5 +1,5 @@
 // Copyright 2018-2020 the Deno authors. All rights reserved. MIT license.
-import { assert, assertEquals } from "../testing/asserts.ts";
+import { assert, assertEquals, assertMatch } from "../testing/asserts.ts";
 import { Logger, LogRecord } from "./logger.ts";
 import { LevelName, LogLevels } from "./levels.ts";
 import { BaseHandler } from "./handlers.ts";
@@ -243,5 +243,13 @@ Deno.test(
     });
     assertEquals(handler.messages[16], 'ERROR {"payload":"data","other":123}');
     assertEquals(handler.messages[17], 'ERROR {"payload":"data","other":123}');
+
+    // error
+    const error = new RangeError("Uh-oh!");
+    const data19: RangeError = logger.error(error);
+    assertEquals(data19, error);
+    const messages19 = handler.messages[18].split("\n");
+    assertEquals(messages19[0], `ERROR ${error.name}: ${error.message}`);
+    assertMatch(messages19[1], /^\s+at file:.*\d+:\d+$/);
   },
 );