fix(ext/node): implement uv.errname (#20785)

Fixes #20617
denoland · Oct 12, 2023 · e377c17 · e377c17
1 parent 0fb5d2e
commit e377c17
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diff --git a/cli/tests/unit_node/process_test.ts b/cli/tests/unit_node/process_test.ts
@@ -786,3 +786,16 @@ Deno.test({
     worker.terminate();
   },
 });
+
+Deno.test({
+  name: "process.binding('uv').errname",
+  ignore: Deno.build.os === "windows",
+  fn() {
+    // @ts-ignore: untyped internal binding, not actually supposed to be
+    // used by userland modules in Node.js
+    const uv = process.binding("uv");
+    assert(uv.errname);
+    assert(typeof uv.errname === "function");
+    assertEquals(uv.errname(-1), "EPERM");
+  },
+});
diff --git a/ext/node/polyfills/internal_binding/uv.ts b/ext/node/polyfills/internal_binding/uv.ts
@@ -531,3 +531,11 @@ export const UV_EINVAL = codeMap.get("EINVAL")!;
 export const UV_ENOENT = codeMap.get("ENOENT");
 export const UV_ENOTSOCK = codeMap.get("ENOTSOCK")!;
 export const UV_UNKNOWN = codeMap.get("UNKNOWN")!;
+
+export function errname(errno: number): string {
+  const err = errorMap.get(errno);
+  if (err) {
+    return err[0];
+  }
+  return `UNKNOWN (${errno})`;
+}