Function maybeAddDelimiter

src/util/getTextWithPossibleDelimiter.ts:15–29

(
  sourceText: string,
  destination: TypedSelection
)

/** Possibly add delimiter for positions before/after */
export function maybeAddDelimiter(
  sourceText: string,
  destination: TypedSelection
) {
  const { insideOutsideType, position } = destination;
  const containingListDelimiter =
    destination.selectionContext.containingListDelimiter;
  return containingListDelimiter == null ||
    position === "contents" ||
    insideOutsideType === "inside"
    ? sourceText
    : destination.position === "after"
    ? containingListDelimiter + sourceText
    : sourceText + containingListDelimiter;
}