import type { BrowserWorkerBackendPort, BrowserWorkerHandle, RunMatTestSession, WorkerCancellationInput, WorkerExecution, WorkerExecutionInput, WorkerSpawnInput } from "./types.js";
export interface BrowserWorkerBackendOptions {
    workerFactory?: () => Worker;
    sessionFactory: (input: WorkerSpawnInput) => Promise<RunMatTestSession> | RunMatTestSession;
    projectHandoff?: unknown;
    filesystemSnapshot?: import("./types.js").BrowserTestFilesystemEntry[];
    maxWorkers?: number;
    signal?: AbortSignal;
    /** Narrows capacity when the caller explicitly selects shared-session isolation. */
    requestedIsolation?: "auto" | "worker" | "session" | "none";
}
export declare class BrowserWorkerBackend implements BrowserWorkerBackendPort {
    private readonly options;
    private readonly handles;
    private readonly cancellation;
    private resolveCancellation;
    private nextId;
    private sharedSession?;
    constructor(options: BrowserWorkerBackendOptions);
    capabilities(): {
        isolation: Array<"worker" | "session" | "none">;
        maxWorkers: number;
    };
    spawn(input: WorkerSpawnInput): Promise<BrowserWorkerHandle>;
    execute(external: BrowserWorkerHandle, input: WorkerExecutionInput): Promise<WorkerExecution>;
    cancel(external: BrowserWorkerHandle, input: WorkerCancellationInput): Promise<WorkerExecution | null>;
    terminate(external: BrowserWorkerHandle): Promise<void>;
    shutdown(external: BrowserWorkerHandle): Promise<void>;
    isCancelled(): boolean;
    cancellationReason(): string | undefined;
    waitForCancellation(): Promise<string>;
    dispose(): Promise<void>;
    private handle;
    private noneSession;
}
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