Function append

src/useFieldArray.ts:173–199

(
    value:
      | Partial<FieldArray<TFieldValues, TFieldArrayName>>
      | Partial<FieldArray<TFieldValues, TFieldArrayName>>[],
    options?: FieldArrayMethodProps,
  )

  );

  const append = (
    value:
      | Partial<FieldArray<TFieldValues, TFieldArrayName>>
      | Partial<FieldArray<TFieldValues, TFieldArrayName>>[],
    options?: FieldArrayMethodProps,
  ) => {
    if (disabled) {
      return;
    }

    const appendValue = convertToArrayPayload(cloneObject(value));
    const updatedFieldArrayValues = appendAt(
      control._getFieldArray(name),
      appendValue,
    );
    control._names.focus = getFocusFieldName(
      name,
      updatedFieldArrayValues.length - 1,
      options,
    );
    ids.current = appendAt(ids.current, appendValue.map(generateId));
    updateValues(updatedFieldArrayValues);
    setFields(updatedFieldArrayValues);
    control._setFieldArray(name, updatedFieldArrayValues, appendAt, {
      argA: fillEmptyArray(value),
    });
  };

  const prepend = (
    value: