Function getNextElement

src/tab.ts:12–29

(
  currentIndex: number,
  shift: boolean,
  elements: Element[],
  focusTrap: Document | Element,
)

import {blur} from './blur'

function getNextElement(
  currentIndex: number,
  shift: boolean,
  elements: Element[],
  focusTrap: Document | Element,
) {
  if (
    isDocument(focusTrap) &&
    ((currentIndex === 0 && shift) ||
      (currentIndex === elements.length - 1 && !shift))
  ) {
    return focusTrap.body
  }

  const nextIndex = shift ? currentIndex - 1 : currentIndex + 1
  const defaultIndex = shift ? elements.length - 1 : 0
  return elements[nextIndex] || elements[defaultIndex]
}

interface tabOptions {
  shift?: boolean