From 07055435550aebdeb948b9a0f78238c15ef4bf1b Mon Sep 17 00:00:00 2001
From: Eric Carr <eric@carr.no>
Date: Fri, 14 Dec 2018 16:17:45 +0100
Subject: [PATCH 1/2] Make onWriteFail configurable

---
 src/createPersistoid.js | 2 ++
 src/types.js            | 1 +
 2 files changed, 3 insertions(+)

diff --git a/src/createPersistoid.js b/src/createPersistoid.js
index 56be8dc52..c4423af60 100644
--- a/src/createPersistoid.js
+++ b/src/createPersistoid.js
@@ -17,6 +17,7 @@ export default function createPersistoid(config: PersistConfig): Persistoid {
   }${config.key}`
   const storage = config.storage
   const serialize = config.serialize === false ? x => x : defaultSerialize
+  const writeFailHandler = config.writeFailHandler || null
 
   // initialize stateful values
   let lastState = {}
@@ -107,6 +108,7 @@ export default function createPersistoid(config: PersistConfig): Persistoid {
 
   function onWriteFail(err) {
     // @TODO add fail handlers (typically storage full)
+    if (writeFailHandler) writeFailHandler(err)
     if (err && process.env.NODE_ENV !== 'production') {
       console.error('Error storing data', err)
     }
diff --git a/src/types.js b/src/types.js
index 3f7f9fd78..13549104b 100644
--- a/src/types.js
+++ b/src/types.js
@@ -25,6 +25,7 @@ export type PersistConfig = {
   debug?: boolean,
   serialize?: boolean,
   timeout?: number,
+  writeFailHandler?: Function,
 }
 
 export type PersistorOptions = {

From a5d4dccd0562726c58f442dbe3f0b68ac2ced305 Mon Sep 17 00:00:00 2001
From: Eric Carr <eric@carr.no>
Date: Sat, 15 Dec 2018 00:32:14 +0100
Subject: [PATCH 2/2] Documented PersistConfig.writeFailHandler

---
 docs/api.md | 4 ++++
 1 file changed, 4 insertions(+)

diff --git a/docs/api.md b/docs/api.md
index 350b619aa..be180465f 100644
--- a/docs/api.md
+++ b/docs/api.md
@@ -63,9 +63,13 @@ The Persistor is a redux store unto itself, plus
   debug?: boolean, // true -> verbose logs
   stateReconciler?: false | StateReconciler, // false -> do not automatically reconcile state
   serialize?: boolean, // false -> do not call JSON.parse & stringify when setting & getting from storage
+  writeFailHandler?: Function, // will be called if the storage engine fails during setItem()
 }
 ```
 
+Persisting state involves calling setItem() on the storage engine. By default, this will fail silently if the storage/quota is exhausted.  
+Provide a writeFailHandler(error) function to be notified if this occurs.
+
 ### `type MigrationManifest`
 ```js
 {