export interface KeySpec {
    key: string;
    code: string;
    keyCode: number;
    text?: string;
}
/** CDP `modifiers` bitmask values. */
export declare const MODIFIER_BITS: {
    readonly Alt: 1;
    readonly Control: 2;
    readonly Meta: 4;
    readonly Shift: 8;
};
export type ModifierKey = keyof typeof MODIFIER_BITS;
/** Key names agents may pass to a press action, with their CDP codes. */
export declare const KEY_SPECS: Record<string, KeySpec>;
/** Resolves a key name in any common spelling (DOM, xdotool, short forms)
 *  to its canonical DOM key name. Single characters pass through. */
export declare function normalizeKeyName(name: string): string;
export declare function keySpecFor(name: string): KeySpec;
export interface Chord {
    modifiers: ModifierKey[];
    key: KeySpec | null;
}
/** Parses "ctrl+shift+a", "Control+C", "Return" or ["Control", "C"] into one chord.
 *  A chord made only of modifiers (e.g. "shift") has `key` null. */
export declare function parseChord(input: string | string[]): Chord;
export declare function modifierMask(modifiers: Iterable<ModifierKey>): number;
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