feat(std/node): implement getSystemErrorName() (#7624)

1 files changed, 17 insertions, 1 deletions

diff --git a/std/node/util.ts b/std/node/util.ts
index 27aa5a12b..076a5b830 100644
--- a/std/node/util.ts
+++ b/std/node/util.ts
@@ -1,10 +1,16 @@
 // Copyright 2018-2020 the Deno authors. All rights reserved. MIT license.
 export { promisify } from "./_util/_util_promisify.ts";
 export { callbackify } from "./_util/_util_callbackify.ts";
+import { codes, errorMap } from "./_errors.ts";
 import * as types from "./_util/_util_types.ts";
-
 export { types };
 
+const NumberIsSafeInteger = Number.isSafeInteger;
+const {
+  ERR_OUT_OF_RANGE,
+  ERR_INVALID_ARG_TYPE,
+} = codes;
+
 const DEFAULT_INSPECT_OPTIONS = {
   showHidden: false,
   depth: 2,
@@ -90,6 +96,16 @@ export function isPrimitive(value: unknown): boolean {
   );
 }
 
+export function getSystemErrorName(code: number): string | undefined {
+  if (typeof code !== "number") {
+    throw new ERR_INVALID_ARG_TYPE("err", "number", code);
+  }
+  if (code >= 0 || !NumberIsSafeInteger(code)) {
+    throw new ERR_OUT_OF_RANGE("err", "a negative integer", code);
+  }
+  return errorMap.get(code)?.[0];
+}
+
 import { _TextDecoder, _TextEncoder } from "./_utils.ts";
 
 /** The global TextDecoder */