import { type AltEditorLiteLanguage } from '../core/alt-editor-lite-language.js';
/** Fetch settings and resource limits for an external editor language. */
export interface EditorLanguageLoadOptions extends RequestInit {
    readonly maxResourceBytes?: number;
}
/**
 * Returns the canonical form of a BCP 47 locale identifier.
 *
 * @param localeName - Locale identifier to normalize.
 * @returns The canonical locale identifier.
 * @throws EditorConfigurationError when the identifier is invalid.
 */
export declare function normalizeLocaleName(localeName: string): string;
/**
 * Validates external language data and merges it with the English fallback.
 *
 * @param value - Parsed language resource.
 * @returns Complete validated language data.
 */
export declare function resolveEditorLanguageResource(value: unknown): Readonly<AltEditorLiteLanguage>;
/**
 * Loads a JSON language resource and combines it with the English fallback.
 *
 * The editor constructor remains synchronous: await this function before
 * creating an editor instance.
 *
 * @param resource - URL or request for a JSON language resource.
 * @param options - Optional Fetch API settings and response size limit.
 * @returns Complete validated language data.
 * @throws EditorConfigurationError when maxResourceBytes is invalid.
 * @throws EditorLanguageLoadError when the request or validation fails.
 */
export declare function loadEditorLanguage(resource: RequestInfo | URL, options?: EditorLanguageLoadOptions): Promise<Readonly<AltEditorLiteLanguage>>;