/**
 * Injects Monaco's editor stylesheet into `document.head` once, so a
 * self-hosted editor is styled without the consumer importing any Blend
 * stylesheet. Idempotent across every editor instance and safe to call when a
 * previous mount (or another bundle of this package with the same Monaco
 * version) already injected it.
 *
 * Assumes a light-DOM consumer: it appends to `document.head`, so the styles do
 * not cross into a shadow root. A Shadow-DOM-scoped editor would need the CSS
 * injected into its own root (not handled here today).
 */
export declare const injectMonacoStyles: () => void;