import type { SessionView } from '../../ops/types.ts';
import type { Session } from './session.ts';
/**
 * Whether a `name` / `name[sub]` reference names a set value.
 *
 * What `test -v` asks. A bare name over an array checks element 0 (the
 * literal key `"0"` for an associative one), which is GNU's rule;
 * `name[@]` and `name[*]` ask whether any element is set. An
 * associative subscript is the key verbatim; an indexed one evaluates
 * as arithmetic.
 */
export declare function elementIsSet(session: Session, ref: string): boolean;
/**
 * Assign one element (or a bare name resolved as element 0).
 *
 * The element mechanics are computed on a copy and the landing write
 * goes through the door as the whole variable the write produces, so a
 * refused write leaves nothing half-applied and a `preSession` rule
 * sees `m[k]=v` as a write to `m`. The subscript arrives already
 * expanded: an associative name takes it as the key verbatim, an
 * indexed one evaluates it as arithmetic. A null subscript is a bare
 * target, which bash resolves as element 0 of an array and a plain
 * scalar otherwise. Answers `"ok"`, `"denied"`, `"readonly"`, or
 * `"subscript"`; a preSession refusal from the door propagates so the
 * rule's own message reaches the caller.
 */
export declare function assignElement(session: Session, view: SessionView | null, name: string, subscript: string | null, value: string, append?: boolean): Promise<'ok' | 'denied' | 'readonly' | 'subscript'>;
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