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getSystemErrorMap - util - Node documentation
function getSystemErrorMap

Usage in Deno

import { getSystemErrorMap } from "node:util";
getSystemErrorMap(): Map<number, [string, string]>
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Returns a Map of all system error codes available from the Node.js API. The mapping between error codes and error names is platform-dependent. See Common System Errors for the names of common errors.

fs.access('file/that/does/not/exist', (err) => {
  const errorMap = util.getSystemErrorMap();
  const name = errorMap.get(err.errno);
  console.error(name);  // ENOENT
});

Return Type

Map<number, [string, string]>