import { IOResult } from '../../../../io/types.ts';
import type { DispatchFn } from '../../../../runtime/types.ts';
import { type Redirect } from '../../../../shell/types.ts';
import type { Session } from '../../../session/session.ts';
import type { BuiltinCall, Result } from '../types.ts';
/** The `exec` builtin without redirects: bare `exec` is a no-op that
 * succeeds; `exec CMD` has no OS-process referent and is refused. */
export declare function handleExecCommand(args: string[], _session: Session): Result;
/**
 * Point the shell's own streams at files for the rest of the shell. `exec
 * > file` diverts later stdout, `2> file` stderr, `< file` stdin, `>>`
 * appends; `2>&1`/`>&2` copy one target onto the other; `>&-` closes.
 * The output file is opened now, as bash opens it at exec time.
 */
export declare function installExecRedirects(dispatch: DispatchFn, session: Session, redirects: Redirect[]): Promise<Result>;
/**
 * Send one statement's output to the shell's `exec` targets: a stream
 * pointing at a file is appended to it and cleared so it does not also
 * reach the terminal; a closed stream drops. Returns the stdout that
 * should still bubble up (null once diverted).
 */
export declare function divertStatement(dispatch: DispatchFn, session: Session, stdout: Uint8Array | null, io: IOResult): Promise<Uint8Array | null>;
/**
 * The `exec` arm. The redirect-only form is intercepted where redirects
 * are applied; a bare `exec` here has none, and `exec cmd` is the
 * process-replacement form this refuses.
 */
export declare function execBuiltin(call: BuiltinCall): Promise<Result>;
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