feat(core.js): pass logEntry to collapsed function

README.md

@@ -119,7 +119,7 @@ on error" in dev tools harder to use, as it breaks on re-throw rather than the o
 
 *Default: `true`*
 
-#### __collapsed = (getState: Function, action: Object) => Boolean__
+#### __collapsed = (getState: Function, action: Object, logEntry: Object) => Boolean__
 Takes a boolean or optionally a function that receives `getState` function for accessing current store state and `action` object as parameters. Returns `true` if the log group should be collapsed, `false` otherwise.
 
 *Default: `false`*
@@ -202,6 +202,13 @@ createLogger({
 });
 ```
 
+### Collapse actions that don't have errors
+```javascript
+createLogger({
+  collapsed: (getState, action, logEntry) => !logEntry.error
+});
+```
+
 ### Transform Immutable (without `combineReducers`)
 ```javascript
 import { Iterable } from 'immutable';

src/core.js

@@ -60,7 +60,7 @@ export function printBuffer(buffer, options) {
 
     // Message
     const formattedAction = actionTransformer(action);
-    const isCollapsed = (typeof collapsed === `function`) ? collapsed(() => nextState, action) : collapsed;
+    const isCollapsed = (typeof collapsed === `function`) ? collapsed(() => nextState, action, logEntry) : collapsed;
 
     const formattedTime = formatTime(startedTime);
     const titleCSS = colors.title ? `color: ${colors.title(formattedAction)};` : null;