Function getCaretPosition

packages/base/src/util/Caret.ts:5–14

(field: HTMLInputElement)

 * Return value range is 0-field.value.length.
 */
const getCaretPosition = (field: HTMLInputElement): number | null => {
	// Initialize
	let caretPos: number | null = 0;

	if (field.selectionStart || field.selectionStart === 0) { // Firefox support
		caretPos = field.selectionDirection === "backward" ? field.selectionStart : field.selectionEnd;
	}

	return caretPos;
};

const setCaretPosition = (field: HTMLInputElement, caretPos: number | null) => {
	if (field.selectionStart) {