import { ExecResult, SandboxHandle } from './contracts.js';
/**
 * A `WorkspaceBackend` over a live sandbox. With it, `workspaceTools()`
 * reads and writes files and runs commands in the sandbox, not on this
 * machine.
 *
 * Who stops the sandbox:
 *
 * - By default, you. `close()` of the backend stops the jobs that it
 *   started, and leaves the sandbox running.
 * - With `owned: true`, the backend. `close({ reason: 'closed' })` also
 *   destroys the sandbox. Use it for a sandbox that you create in
 *   `workspace.bind`, one for each thread.
 *
 * - Paths are POSIX paths in the sandbox, like `/workspace/src/a.ts`.
 * - `exec` gives exit code 124 when `timeoutMs` stops a command, and 1 when
 *   `signal` stops it. A sandbox with `capabilities.killableProcesses` off
 *   cannot stop the command, so it continues in the sandbox.
 * - `spawn` is there only when the sandbox has
 *   `capabilities.backgroundProcesses`.
 * - `stat` gives `mtimeMs: 0`. The sandbox file system does not give the
 *   time of the last change. With `lstat`, `stat` never reads the file.
 * - The `signal` of a file call goes to the sandbox file system and to the
 *   commands that the call runs, like `readlink`.
 * - `readLines` reads one page of a file in the sandbox with `wc`, `od`,
 *   and `awk`, so only the page comes out of the sandbox.
 * - `realpath` resolves links in the sandbox: `lstat` finds each link, and
 *   `readlink` in the sandbox reads its target. A sandbox without `lstat`
 *   cannot find links, so `realpath` throws, and the tools refuse each path.
 *
 * - `spawn` keeps the newest 1 MiB of the output of a job, and gives each
 *   chunk to `onOutput` as it comes.
 * - `close({ reason: 'moved' })` keeps the jobs and the sandbox, so the
 *   next machine can resume them.
 * - `binding()` gives the provider and the id of the sandbox. The session
 *   log keeps them, so `reattach` of `workspace` can resume the sandbox on
 *   another machine.
 * - The id of a job is its pid in the sandbox and its start time from
 *   `ps`. `killJob` stops it, also from a backend over the same sandbox on
 *   another machine, and only when the process with that pid started at
 *   that time. A sandbox without a `ps -o lstart` cannot check it, so
 *   `killJob` rejects for a job that runs.
 *
 * @param handle - The sandbox, from `provider.create()` or `provider.resume()`.
 * @param options - `owned: true` when the backend owns the sandbox. Then
 *   `close` destroys it. Default: `false`.
 *
 * @example
 * ```ts
 * const provider = localProcessSandbox()
 * workspaceTools({
 *   workspace: {
 *     bind: async () => ({
 *       ...sandboxWorkspaceBackend(await provider.create({}), { owned: true }),
 *       root: '/workspace',
 *     }),
 *   },
 * })
 * ```
 */
export declare function sandboxWorkspaceBackend(handle: SandboxHandle, { owned }?: {
    owned?: boolean;
}): {
    close: (input: {
        reason: "closed" | "moved";
    }) => Promise<void>;
    spawn?: ((command: string, options?: {
        cwd?: string;
        env?: Record<string, string>;
        onOutput?: (text: string) => void;
    }) => {
        wait: () => Promise<{
            exitCode: number;
        }>;
        kill: () => void;
        output: () => string;
        jobId?: Promise<string | undefined>;
    }) | undefined;
    shell: "sh";
    binding: () => {
        kind: "sandbox";
        provider: string;
        sandboxId: string;
    };
    killJob: (jobId: string) => Promise<boolean>;
    readFile: (path: string, options?: {
        signal?: AbortSignal;
    } | undefined) => Promise<Uint8Array<ArrayBufferLike>>;
    writeFile: (path: string, data: string | Uint8Array<ArrayBufferLike>, options?: {
        signal?: AbortSignal;
    } | undefined) => Promise<void>;
    remove: (path: string, options?: {
        signal?: AbortSignal;
    } | undefined) => Promise<void>;
    readLines: (path: string, options: {
        offset: number;
        limit: number;
        signal?: AbortSignal;
    }) => Promise<{
        head: Uint8Array;
        size: number;
        lines: Array<string>;
        total?: number;
    }>;
    stat: (path: string, options?: {
        signal?: AbortSignal;
    }) => Promise<{
        type: "file" | "dir";
        size: number;
        mtimeMs: number;
    } | undefined>;
    realpath: (path: string, options?: {
        signal?: AbortSignal;
    }) => Promise<string | undefined>;
    readdir: (path: string, options?: {
        signal?: AbortSignal;
    } | undefined) => Promise<{
        name: string;
        type: "link" | "file" | "dir";
    }[]>;
    exec: (command: string, options?: {
        cwd?: string;
        env?: Record<string, string>;
        timeoutMs?: number;
        signal?: AbortSignal;
        onStart?: (jobId: string) => void;
    } | undefined) => Promise<ExecResult>;
};