move secondsSinceExpiration computation into separate function

src/CookieBanner.js

@@ -5,8 +5,6 @@ import { t, props } from 'tcomb-react';
 import { cookie as cookieLite } from 'browser-cookie-lite';
 import styleUtils from './styleUtils';
 
-const NotEmptyStruct = t.refinement(t.struct, x => Object.keys(x).length > 0);
-
 const Props = {
   children: t.maybe(t.ReactChildren),
   message: t.maybe(t.String),
@@ -18,7 +16,7 @@ const Props = {
   })),
   buttonMessage: t.maybe(t.String),
   cookie: t.maybe(t.String),
-  cookieExpiration: t.maybe(t.union([NotEmptyStruct({
+  cookieExpiration: t.maybe(t.union([t.struct({
     years: t.maybe(t.Number),
     days: t.maybe(t.Number),
     hours: t.maybe(t.Number)
@@ -96,18 +94,29 @@ export default class CookieBanner extends React.Component {
     }
   }
 
-  onAccept = () => {
-    const { cookie, cookieExpiration, onAccept } = this.props;
+  getSecondsSinceExpiration = cookieExpiration => {
+    if (t.Integer.is(cookieExpiration)) {
+      return cookieExpiration;
+    }
 
     const SECONDS_IN_YEAR = 31536000;
     const SECONDS_IN_DAY = 86400;
     const SECONDS_IN_HOUR = 3600;
 
-    const secondsSinceExpiration = t.Integer.is(cookieExpiration) ?
-      cookieExpiration :
-      (cookieExpiration.years * SECONDS_IN_YEAR) + (cookieExpiration.days * SECONDS_IN_DAY) + (cookieExpiration.hours * SECONDS_IN_HOUR);
+    const _cookieExpiration = {
+      years: 0, days: 0, hours: 0,
+      ...cookieExpiration
+    };
+
+    const { years, days, hours } = _cookieExpiration;
+
+    return (years * SECONDS_IN_YEAR) + (days * SECONDS_IN_DAY) + (hours * SECONDS_IN_HOUR);
+  }
+
+  onAccept = () => {
+    const { cookie, cookieExpiration, onAccept } = this.props;
 
-    cookieLite(cookie, true, secondsSinceExpiration);
+    cookieLite(cookie, true, this.getSecondsSinceExpiration(cookieExpiration));
     onAccept({ cookie });
 
     if (this.state.listeningScroll) {