Bun-specific TypeScript error with `string.url` submodule reference

[yamcodes]

In Bun environments, using "string.url" directly in arkenv config causes a TypeScript error:

Type '"string.url"' is not assignable to type '"Reference to submodule 'string.url' must specify an alias"'.

Current behavior:

import arkenv from "arkenv";

const env = arkenv({
  TURSO_DATABASE_URL: "string.url", // ❌ TypeScript error in Bun
});

Expected behavior:
Should work the same as in Node.js, where "string.url" is accepted without errors.

Environment:

• ✅ Works in Node.js v24
• ❌ Fails in Bun v1.2.22 and v1.3.2
• Type-level issue only (runtime validation works correctly)

Workaround:
Users can use "string.url" as "string" or import type from arktype directly, but this shouldn't be necessary.

Root cause identified: This issue occurs when tsconfig.json uses module: "commonjs". See #378 for the consolidated issue.

Related:

• Issue Question: How to type URLs? #374 (original question)
• Issue TypeScript type errors when using moduleResolution: "Node10" or "Node" in tsconfig #378 (root cause - TypeScript type errors with module: "commonjs")

[yamcodes]

Closed as a symptom of #378. This isn't a Bun specific issue after all.