/**
 * @file
 * Utilities for handling keyboard events.
 */
/**
 * A utility for mapping key names with their numeric codes. This is an alias for [the third-party
 * library, keycode](https://github.com/timoxley/keycode).
 *
 * @deprecated This function is deprecated and will be removed in a future major version.
 * Use `KeyboardEvent`'s `key` property for identifying key presses instead.
 * @param {KeyboardEvent} event - A keyboard event.
 * @returns {String}
 * @public
 */
export declare function keycode(event: KeyboardEvent): string | number | undefined;
/**
 * Tests if the event key is a number.
 * @param {Event} event - @deprecated Support for `keyCode` in this function is deprecated and will be removed in a future major version.
 * A keyboard event that includes a `key`, a `keyCode`, or both.
 * @returns {Boolean}
 * @public
 */
export declare function isNumber({ key, keyCode }: KeyboardEvent): boolean;
/**
 * Tests if the event key is a decimal.
 * @param {Event} event - @deprecated Support for `keyCode` in this function is deprecated and will be removed in a future major version.
 * A keyboard event that includes a `key`, a `keyCode`, or both.
 * @param {Object} [options]
 * @param {String} [locale.string = 'en-US'] -  The locale determines the decimal separator. Supported locale formats are: `xx`, `xx-XX`, and `xx_XX`.
 * @returns {Boolean}
 * @public
 */
export declare function isDecimal({ key, keyCode }: KeyboardEvent, { locale }?: {
    locale?: string | undefined;
}): boolean;
/**
 * Tests if the event key is a minus sign.
 * @param {Event} event - @deprecated Support for `keyCode` in this function is deprecated and will be removed in a future major version.
 * A keyboard event that includes a `key`, a `keyCode`, or both.
 * @returns {Boolean}
 * @public
 */
export declare function isMinus({ key, keyCode }: KeyboardEvent): boolean;
/**
 * Tests if the event key is a numeric character (number, decimal, or minus).
 * @param {Event} event - @deprecated Support for `keyCode` in this function is deprecated and will be removed in a future major version.
 * A keyboard event that includes a `key`, a `keyCode`, or both.
 * @param {Object} [options]
 * @param {String} [locale.string = 'en-US'] - The locale determines the decimal separator. Supported locale formats are: `xx`, `xx-XX`, and `xx_XX`.
 * @returns {Boolean}
 * @public
 */
export declare function isNumeric(event: KeyboardEvent, options?: {
    locale?: string;
}): boolean;
/**
 * Tests if the event key adds a character. Enter and Tab return false even though they
 * add characters in some situations.
 * Caveat: Safari 9.0 and earlier might return undefined as this cannot be practically
 * determined.
 * @param {Event} event - A keyboard event that includes a key.
 * @returns {Boolean|Undefined}
 * @public
 */
export declare function addsCharacter({ key }: KeyboardEvent): boolean | undefined;