Function opAppend

packages/cli/src/util/dev/transforms.ts:376–397

(
  data: TransformData,
  matchedKeys: string[],
  keySelector: KeyRule,
  args: string | string[] | undefined,
  isHeader: boolean
)

}

function opAppend(
  data: TransformData,
  matchedKeys: string[],
  keySelector: KeyRule,
  args: string | string[] | undefined,
  isHeader: boolean
) {
  if (isEmptyArgs(args)) {
    return;
  }
  const toAppend = typeof args === 'string' ? [args] : (args ?? []);

  for (const key of matchedKeys) {
    const next = [...toValueList(data[key], isHeader), ...toAppend];
    setTransformValue(data, key, fromValueList(next));
  }

  // create new key if nothing matched as key selector is a simple string
  if (matchedKeys.length === 0 && typeof keySelector === 'string') {
    setTransformValue(data, keySelector, fromValueList(toAppend));
  }
}

function opDelete(
  data: TransformData,