export type EgressConfig = readonly string[] | "all" | undefined;
/** The slice of a sandbox adapter this seam touches (structural on purpose —
 *  `SandboxAdapterLike` in harnesses and `SandboxAdapter` in apps both fit). */
interface CreatesBoxes {
    create(spec: {
        template?: string;
        env: Record<string, string>;
        allowedDomains?: string[];
    }): Promise<unknown>;
}
export declare function resolveEgress(config: EgressConfig): string[] | "all" | undefined;
export declare function withEgress<A extends CreatesBoxes>(sandbox: A, config: EgressConfig, onBoxBoot: (domains: string[] | "all") => Promise<void> | void): A;
export {};