Is there a better way to bind enum-like const objects?

[agladysh]

I often need to accept a value from an "enum":

// declare const bundledLanguages: Record<BundledLanguage, DynamicImportLanguageRegistration> etc.
import { BundledLanguage, bundledLanguages } from 'shiki/langs';
import { BundledTheme, bundledThemes } from 'shiki/themes';

const $ = scope({
  params: {
    lang: `"${Object.keys(bundledLanguages).join('"|"')}"` as type.cast<BundledLanguage>,
    theme: [
      `"${Object.keys(bundledThemes).join('"|"')}"`, '=', 'solarized-light',
    ] as type.cast<BundledTheme>,
  },
});

This works, but is there an adaptor to avoid this Object.keys...join mess? I guess it is easy enough to roll my own, but maybe I am missing an Arktype idiom?