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diff --git a/node_modules/moment/src/lib/duration/bubble.js b/node_modules/moment/src/lib/duration/bubble.js
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+++ b/node_modules/moment/src/lib/duration/bubble.js
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+import absFloor from '../utils/abs-floor';
+import absCeil from '../utils/abs-ceil';
+
+export function bubble() {
+    var milliseconds = this._milliseconds,
+        days = this._days,
+        months = this._months,
+        data = this._data,
+        seconds,
+        minutes,
+        hours,
+        years,
+        monthsFromDays;
+
+    // if we have a mix of positive and negative values, bubble down first
+    // check: https://github.com/moment/moment/issues/2166
+    if (
+        !(
+            (milliseconds >= 0 && days >= 0 && months >= 0) ||
+            (milliseconds <= 0 && days <= 0 && months <= 0)
+        )
+    ) {
+        milliseconds += absCeil(monthsToDays(months) + days) * 864e5;
+        days = 0;
+        months = 0;
+    }
+
+    // The following code bubbles up values, see the tests for
+    // examples of what that means.
+    data.milliseconds = milliseconds % 1000;
+
+    seconds = absFloor(milliseconds / 1000);
+    data.seconds = seconds % 60;
+
+    minutes = absFloor(seconds / 60);
+    data.minutes = minutes % 60;
+
+    hours = absFloor(minutes / 60);
+    data.hours = hours % 24;
+
+    days += absFloor(hours / 24);
+
+    // convert days to months
+    monthsFromDays = absFloor(daysToMonths(days));
+    months += monthsFromDays;
+    days -= absCeil(monthsToDays(monthsFromDays));
+
+    // 12 months -> 1 year
+    years = absFloor(months / 12);
+    months %= 12;
+
+    data.days = days;
+    data.months = months;
+    data.years = years;
+
+    return this;
+}
+
+export function daysToMonths(days) {
+    // 400 years have 146097 days (taking into account leap year rules)
+    // 400 years have 12 months === 4800
+    return (days * 4800) / 146097;
+}
+
+export function monthsToDays(months) {
+    // the reverse of daysToMonths
+    return (months * 146097) / 4800;
+}