log4ngx
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    Configuration

    The configuration is defined using the LogServiceConfig interface. This can be done directly within main.ts and passed into the providers:

    const loggingConfig: LogServiceConfig = {
    loggers: [
    {
    loggerName: '',
    level: 'warn',
    appenderNames: [
    'console'
    ]
    }
    ],
    appenders: [
    {
    name: 'console',
    providerToken: CONSOLE_APPENDER_TOKEN,
    logFormat: `[${AppenderPlaceholders.Level}] ${AppenderPlaceholders.Logger} ${AppenderPlaceholders.Message}${AppenderPlaceholders.Error}`
    }
    ]
    };

    const appConfig = {
    providers: [
    ...
    { provide: CONSOLE_APPENDER_TOKEN, useClass: ConsoleAppender },
    { provide: LOG_SERVICE_CONFIG_TOKEN, useValue: loggingConfig }
    ]
    };

    bootstrapApplication(AppComponent, appConfig)
    .catch(error => console.error(error));

    Alternatively, you can use environment-specific configurations (see environment-specific configurations) which would, for example, allow you to log 'debug'-level statements in development, but only 'info'-level and above in production.

    export const environment = {
    production: false,
    logging: {
    loggers: [
    {
    loggerName: '',
    level: 'debug',
    appenderNames: [
    'console'
    ]
    }
    ],
    appenders: [
    {
    name: 'console',
    providerToken: CONSOLE_APPENDER_TOKEN,
    logFormat: `[${AppenderPlaceholders.Level}] ${AppenderPlaceholders.Logger} ${AppenderPlaceholders.Message}${AppenderPlaceholders.Error}`
    }
    ]
    }
    };

    Then you will just reference the appropriate section of your environment from within the application config:

      { provide: LOG_SERVICE_CONFIG_TOKEN, useValue: environment.logging }