feat(xo-web/addSubscriptions): support initial values

packages/xo-web/src/common/add-subscriptions.js

@@ -1,20 +1,31 @@
 import React from 'react'
-import { map, mapValues, noop } from 'lodash'
+import { forOwn, map } from 'lodash'
 
 const call = fn => fn()
 
 // `subscriptions` can be a function if we want to ensure that the subscription
 // callbacks have been correctly initialized when there are circular dependencies
+//
+// each subscription can be either a `subscribe` function or a `[subscribe, initialValue]` array
 const addSubscriptions = subscriptions => Component =>
   class SubscriptionWrapper extends React.PureComponent {
     constructor(props) {
       super(props)
 
       // provide all props since the beginning (better behavior with Freactal)
-      this.state = mapValues(
+      const state = {}
-        (this._subscribes = typeof subscriptions === 'function' ? subscriptions(props) : subscriptions),
+      const subscribes = {}
-        noop
+      forOwn(typeof subscriptions === 'function' ? subscriptions(props) : subscriptions, (subscription, prop) => {
-      )
+        if (typeof subscription === 'function') {
+          subscribes[prop] = subscription
+          state[prop] = undefined
+        } else {
+          subscribes[prop] = subscription[0]
+          state[prop] = subscription[1]
+        }
+      })
+      this.state = state
+      this._subscribes = subscribes
     }
 
     _unsubscribes = undefined