chore(maintenance): drop support for Node.js 14 (#1802)

package.json

@@ -76,4 +76,4 @@
   "engines": {
     "node": ">=16"
   }
-}
+}

packages/logger/src/formatter/LogFormatter.ts

@@ -7,6 +7,22 @@ import type {
 import type { UnformattedAttributes } from '../types/Logger.js';
 import { LogItem } from './LogItem.js';
 
+/**
+ * Typeguard to monkey patch Error to add a cause property.
+ *
+ * This is needed because the `cause` property is present in ES2022 or newer.
+ * Since we want to be able to format errors in Node 16.x, we need to
+ * add this property ourselves. We can remove this once we drop support
+ * for Node 16.x.
+ *
+ * @see https://nodejs.org/api/errors.html#errors_error_cause
+ */
+const isErrorWithCause = (
+  error: Error
+): error is Error & { cause: unknown } => {
+  return 'cause' in error;
+};
+
 /**
  * This class defines and implements common methods for the formatting of log attributes.
  *
@@ -49,10 +65,11 @@ abstract class LogFormatter implements LogFormatterInterface {
       location: this.getCodeLocation(error.stack),
       message: error.message,
       stack: error.stack,
-      cause:
-        error.cause instanceof Error
+      cause: isErrorWithCause(error)
+        ? error.cause instanceof Error
           ? this.formatError(error.cause)
-          : error.cause,
+          : error.cause
+        : undefined,
     };
   }
 

tsconfig.json

@@ -2,7 +2,7 @@
   "compilerOptions": {
     "incremental": true,
     "composite": true,
-    "target": "ES2022", // Node.js 16
+    "target": "ES2021", // Node.js 16
     "experimentalDecorators": true,
     "module": "commonjs",
     "moduleResolution": "node",