pasteText.js

function pasteText({replacementText, cursorContext, activeQuery}: {replacementText: string; cursorContext: CursorContext; activeQuery: string;}){
  // update text node content with replaced text
  const lastIndex = cursorContext.textBeforeCursor.lastIndexOf(activeQuery);
  cursorContext.textNode.textContent = cursorContext.textNodeContent.substring(0, lastIndex) + replacementText + cursorContext.textAfterCursor;

  const selection = document.getSelection();
  if(!selection) return;

  // put cursor at the end of the replaced text
  const range = document.createRange();
  range.setStart(cursorContext.textNode, lastIndex + replacementText.length);
  range.setEnd(cursorContext.textNode, lastIndex + replacementText.length);
  range.collapse(true);
  selection.removeAllRanges();
  selection.addRange(range);
}