@nhaancs/logging v0.0.4

logging

This module handles logging activities. You can choose to write logs to console or send them to the 3rd parties.

ILogEntry interface

// Each message logged is a object sastified ILogEntry interface
export interface ILogEntry {
  source: string;
  application: string;
  severity: Severity;
  message: string;
  timestamp: Date;
  tags?: string[];
}

Log service

@Injectable()
export class LoggingService {
  // implementation hidden
  /*
  - Use this class to add new messages.
  - Log writer will be responsible to output these 
  messages.
  */
}

Log writer

/**
 * The factory function to initialize the logging service and writer for the
 * application.
 */
export function initializeLogWriter(consoleWriter: ConsoleWriter) {
  return () => {
    return consoleWriter;
  };
}

...

@NgModule({
    ...
    providers: [
        ...
        {
            provide: APP_INITIALIZER,
            useFactory: initializeLogWriter,
            deps: [LoggingService, ConsoleWriter, LogglyWriter],
            multi: true,
        },
    ]
})

After register a log writer, it will automatically listen to log service for new messages. We do not need to do any thing else.

Notes on tsconfig.json

...
"angularCompilerOptions": {
  // publishable library cannot build with ivy
  "enableIvy": false,
  // 3 params below is for https://github.com/angular/angular/issues/23609#issuecomment-386876693
  "skipTemplateCodegen": true,
  "strictMetadataEmit": true,
  "fullTemplateTypeCheck": true
},
...

This library was generated with Nx.

Running unit tests

Run nx test logging to execute the unit tests.