Whether value is an Error carrying one of the given Node code strings — ENOENT, EADDRINUSE, EBUSY. With no codes it matches any error that has a string code at all (which includes Node's ERR_* internal errors, e.g. ERR_MODULE_NOT_FOUND).

This is the guard for the flat classification line that follows a Result.try on Node API calls — the discrimination the codebase used to perform as an err.code !== 'X' && throw err ladder in seven places:

import fs from 'node:fs/promises';
import * as Result from './index.ts';

// Defined, not invoked: the rethrow line is the point, and a sandboxed doctest run
// would trip it with a permission error rather than the declared EEXIST.
async function publish(tmpPath: string, lockPath: string) {
  const linked = await Result.try(fs.link, tmpPath, lockPath);
  if (!linked.ok && !Result.isErrno(linked.error, 'EEXIST')) throw linked.error;
  return linked.ok;
}