import { ScoutKeyboardEvent } from '../index';
export declare const keyStrokeModifier: {
    /**
     * Modifier like shift, ctrl or alt used in keystrokes.
     *
     * A keystroke can consist of multiple modifierBitMask, which can be represented by bitwise OR them together.
     */
    NONE: number;
    CTRL: number;
    CTRL_UNDEFINED: number;
    SHIFT: number;
    SHIFT_UNDEFINED: number;
    ALT: number;
    ALT_UNDEFINED: number;
    isCtrl(modifierBitMask: number): boolean;
    isShift(modifierBitMask: number): boolean;
    isAlt(modifierBitMask: number): boolean;
    /** @internal */
    _eval(testee: number, modifier: number, modifierUndefined: number): boolean;
    toModifierBitMask(event: ScoutKeyboardEvent): number;
};
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