/** `KeyboardEvent.key` value for the spacebar. */
export declare const SPACE_KEY = " ";
/**
 * Returns whether the focused target of an Enter/Space key event will fire its own click on keyup.
 *
 * Such targets activate the popover themselves, so a Select/MultiSelect wrapper must NOT also open on
 * keydown — doing so opens the popover early and then the target's synthesized keyup click toggles it
 * back closed. Targets that do not self-activate (a plain `role="button"` element, a bare anchor) get no
 * such click, so the wrapper is responsible for opening the popover itself.
 *
 * Self-activating targets:
 * - native `<button>` (fires click on Enter and on Space keyup)
 * - Blueprint `<Button>`/`<AnchorButton>`, detected via {@link Classes.BUTTON}, which synthesize a click
 *   on keyup for both keys regardless of tag or `href`
 * - native `<a href>` (fires click on Enter only)
 *
 * The search is scoped to the handler's own element (`currentTarget`) so a clickable ancestor rendered
 * outside the target cannot suppress activation, and a disabled activator is treated as non-activating
 * because it never fires its own click.
 */
export declare function targetSelfActivatesOnKeyUp(event: React.KeyboardEvent<HTMLElement>): boolean;