Function getSelectionRange

src/utils/edit/selectionRange.ts:34–72

(
  element: Element,
)

}

export function getSelectionRange(
  element: Element,
): {
  selectionStart: number | null
  selectionEnd: number | null
} {
  if (hasSelectionSupport(element)) {
    return {
      selectionStart: element.selectionStart,
      selectionEnd: element.selectionEnd,
    }
  }

  if (isElementType(element, 'input')) {
    return (
      (element as InputWithInternalSelection)[InputSelection] ?? {
        selectionStart: null,
        selectionEnd: null,
      }
    )
  }

  const selection = element.ownerDocument.getSelection()

  // there should be no editing if the focusNode is outside of element
  // TODO: properly handle selection ranges
  if (selection?.rangeCount && element.contains(selection.focusNode)) {
    const range = selection.getRangeAt(0)
    return {
      selectionStart: range.startOffset,
      selectionEnd: range.endOffset,
    }
  } else {
    return {
      selectionStart: null,
      selectionEnd: null,
    }
  }
}

export function setSelectionRange(
  element: Element,