import type { KeyEvent } from "./input/types.js";
export type LineEditAction = {
    kind: "append";
    text: string;
} | {
    kind: "backspace";
} | {
    kind: "backspaceWord";
} | {
    kind: "cancel";
} | {
    kind: "submit";
};
/** What a key does while a line is being edited; null for a key that does
 *  nothing there (a Ctrl chord, an arrow). */
export declare function lineEditAction(event: KeyEvent): LineEditAction | null;
/** The draft after an edit. Cancel and submit leave the draft alone: what
 *  they mean belongs to the caller. Backspace removes a whole code point:
 *  an emoji arrives as two UTF-16 halves, and leaving one behind would put
 *  a broken character in the draft. Option+Backspace removes the last word
 *  and the spaces after it, as it does in a shell. */
export declare function applyLineEdit(draft: string, action: LineEditAction): string;