How to use the @ui5/webcomponents-base/dist/events/PseudoEvents.js.isSpace function in @ui5/webcomponents-base

_onkeyup(event) {
		if (isSpace(event)) {
			this.toggle();
		}
	}

_onkeydown(event) {
		if (isSpace(event)) {
			event.preventDefault();
		}

		if (isEnter(event)) {
			this.toggle();
		}
	}

_onkeyup(event) {
		if (isSpace(event) || isEnter(event)) {
			this.deactivate();
		}

		if (isSpace(event)) {
			this.fireItemPress(event);
		}
	}

_onkeyup(event) {
		if (isSpace(event)) {
			this.toggle();
		}
	}

_onkeydown(event) {
		super._onkeydown(event);

		const itemActive = this.type === ListItemType.Active;

		if (isSpace(event)) {
			event.preventDefault();
		}

		if ((isSpace(event) || isEnter(event)) && itemActive) {
			this.activate();
		}

		if (isEnter(event)) {
			this.fireItemPress(event);
		}
	}

_onkeyup(event) {
		if (isSpace(event) || isEnter(event)) {
			this.active = false;
		}

		if (isSpace(event)) {
			this._fireItemClick();
		}
	}

_onkeydown(event) {
		if (isUp(event)) {
			return this._handleUp(event);
		}

		if (isDown(event)) {
			return this._handleDown(event);
		}

		if (isSpace(event)) {
			return this._handleSpace(event);
		}

		if (isEnter(event)) {
			return this._handleEnter(event);
		}

		this._keyDown = true;
	}

_onkeydown(event) {
		if (isSpace(event)) {
			event.preventDefault();
		}

		if (isEnter(event)) {
			this.toggle();
		}
	}

_onkeyup(event) {
		if (isSpace(event)) {
			this.toggle();
		}
	}