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ngrx-store-logger

v0.2.4

Published

Advanced logging middleware for @ngrx/store

Downloads

31,057

Readme

ngrx-store-logger

Advanced logging for @ngrx/store applications, ported from redux-logger.

ngrx-store-logger

Dependencies

ngrx-store-logger depends on @ngrx/store and Angular 2+.

Usage

npm install ngrx-store-logger --save

UPDATED FOR NGRX 4

  1. Import ngrx-store-logger
  2. Wrap in an exported function
  3. Include in your meta-reducers in StoreModule.forRoot call.
import { NgModule } from '@angular/core';
import { BrowserModule } from '@angular/platform-browser';
import { StoreModule, ActionReducer } from '@ngrx/store';
import { storeLogger } from 'ngrx-store-logger';
import { reducers } from './reducers';

export function logger(reducer: ActionReducer<State>): any {
  // default, no options
  return storeLogger()(reducer);
}

export const metaReducers = environment.production ? [] : [logger];

@NgModule({
  imports: [
    BrowserModule,
    StoreModule.forRoot(
        reducers,
        {metaReducers}
    )
  ]
})
export class MyAppModule {}

API

storeLogger(options : LoggerOptions = {}) : Reducer

Initializes logger with appropriate options (logical defaults if no options supplied) Returns a meta-reducer

Arguments

  • options (Object): Available logger options
Options
interface LoggerOptions {
    level? : 'log' | 'console' | 'warn' | 'error' | 'info'; //default log
    collapsed? : boolean; //Should log group be collapsed? default: false
    duration? : boolean; //Print duration with action? default: true
    timestamp? : boolean; //Print timestamp with action? default: true
    filter?: {
      whitelist?: string[], // Only print actions included in this list - has priority over blacklist
      blacklist?: string[] // Only print actions that are NOT included in this list
    }
    stateTransformer? : (state : Object) => Object; //Transform state before print default: state => state
    actionTransformer? : (actn : Object) => Object; //Transform action before print default: actn => actn
    colors? : {
        title: (action : Object) => string;
        prevState: (prevState : Object) => string;
        action: (action: Object) => string;
        nextState: (nextState : Object) => string;
        error: (error: any, prevState: Object) => string;
    }
}

Filtering

Whitelist

Only actions included in the list will be printed Example:

const options: LoggerOptions = {
  filter: {
    whitelist: ['set-value']
  }
}
storeLogger(options) : Reducer

With this setup, only action set-value will be logged

Blacklist

Action included in the blacklist will not be printed Example:

const options: LoggerOptions = {
  filter: {
    blacklist: ['set-value']
  }
}
storeLogger(options) : Reducer

With this setup, all actions except set-value will be printed

Note: Whitelist takes precedence over blacklist. If both are defined, only whitelist will be considered