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Log a single middleware, only actions and state within that middleware field
MyOtherMiddleware().logger().lift(...)
Log a single middleware, but including actions and state changes for the whole app
(same as adding LoggerMiddleware.default() in the chain as seen in the first option)
MyOtherMiddleware().lift(...).logger()
Log a specific group of actions and state tree
IdentityMiddleware<InterestingAction,InterestingAction,InterestingState>().logger().lift(...) // lift InterestingAction and InterestingState to AppAction and AppState<>MyOtherMiddleware().lift(...)
Parameters
actionTransform
Gives the Input Action and Action Source to be formatted as a string.
Gives the previous state, and the state after the reducers have changed it, so a diff string can be created.Difference struct contains helpers to compare multiline strings, anddumpToString free function is a helper to stringify anything.Alternatively you could stringify using JSONEncoder or any other tool. Be careful with performance, or provide an alternative queueto avoid locking the main queue with heavy log task.Returningnil means that nothing has changed.The default logger will give a "git diff" output, containing + and - for changed lines, including 2 lines of context before and after the change.
Gives the state diff string, formatted from previous parameter, to be logged or saved into a file.Receivingnil means that the state hasn't changed with this action.
Default:
stateDiffPrinter: @escaping(String?)-> Void={ stateiniflet state= state{os_log(.debug, log:.default,"%{PUBLIC}@", state)}else{os_log(.debug, log:.default,"%{PUBLIC}@","🏛 No state mutation")}}
queue
The queue to run the string transformation and printer. Use an alternative, low priority, serial queue to avoid locking the UIwith logging operations.