1 import { createDuration } from './create';
3 function addSubtract (duration, input, value, direction) {
4 var other = createDuration(input, value);
6 duration._milliseconds += direction * other._milliseconds;
7 duration._days += direction * other._days;
8 duration._months += direction * other._months;
10 return duration._bubble();
13 // supports only 2.0-style add(1, 's') or add(duration)
14 export function add (input, value) {
15 return addSubtract(this, input, value, 1);
18 // supports only 2.0-style subtract(1, 's') or subtract(duration)
19 export function subtract (input, value) {
20 return addSubtract(this, input, value, -1);