import { Syntax } from "./types";
export declare function stripWhitespace(text: string): string;
export declare function elementCodeContent(element: HTMLElement): string;
/**
 * Fetches and deflates a .tar.gz file representing a base filesystem.
 * This is for languages that require specific files to already exist.
 *
 * Prefers .tar.gz files in ustar format.
 *
 * @param fsURL The URL of the filesystem to fetch
 */
export declare function fetchWASIFS(fsURL: string): Promise<import("@runno/wasi").BinaryWASIFS>;
export declare function isErrorObject(e: unknown): e is {
    type: string;
    message: string;
};
export declare function makeRunnoError(e: unknown): {
    type: string;
    message: string;
};
export declare function extractErrorMessage(e: unknown): string;
export declare function assertUnreachable(_: never, message?: string): never;
export declare function runtimeToSyntax(runtime: string | undefined | null): Syntax;