How to use the @nebular/auth.NbAuthResult function in @nebular/auth

map((params: any) => {
          if (!params.error) {
            return new NbAuthResult(
              true,
              params,
              this.getOption('redirect.success'),
              [],
              this.getOption('defaultMessages'),
              this.createToken(params, requireValidToken));
          }
          return new NbAuthResult(
            false,
            params,
            this.getOption('redirect.failure'),
            this.getOption('defaultErrors'),
            [],
          );
        }),
        catchError(err => {

map((params: any) => {
          if (!params.error) {
            return new NbAuthResult(
              true,
              params,
              this.getOption('redirect.success'),
              [],
              this.getOption('defaultMessages'),
              this.createToken(params, requireValidToken));
          }
          return new NbAuthResult(
            false,
            params,
            this.getOption('redirect.failure'),
            this.getOption('defaultErrors'),
            [],
          );
        }),
        catchError(err => {

catchError(err => {
          const errors = [];
          if (err instanceof NbAuthIllegalTokenError) {
            errors.push(err.message);
          } else {
            errors.push('Something went wrong.');
          }
          return of(
            new NbAuthResult(
              false,
              err,
              this.getOption('redirect.failure'),
              errors,
            ));
        }),
      );

map((params: any) => {
          if (!params.error) {
            return new NbAuthResult(
              true,
              params,
              this.getOption('redirect.success'),
              [],
              this.getOption('defaultMessages'),
              this.createToken(params, requireValidToken));
          }
          return new NbAuthResult(
            false,
            params,
            this.getOption('redirect.failure'),
            this.getOption('defaultErrors'),
            [],
          );
        }),
        catchError(err => {

catchError(err => {
          const errors = [];
          if (err instanceof NbAuthIllegalTokenError) {
            errors.push(err.message);
          } else {
            errors.push('Something went wrong.');
          }
          return of(
            new NbAuthResult(
              false,
              err,
              this.getOption('redirect.failure'),
              errors,
            ));
        }),
      );

map((params: any) => {
          if (!params.error) {
            return new NbAuthResult(
              true,
              params,
              this.getOption('redirect.success'),
              [],
              this.getOption('defaultMessages'),
              this.createToken(params, requireValidToken));
          }
          return new NbAuthResult(
            false,
            params,
            this.getOption('redirect.failure'),
            this.getOption('defaultErrors'),
            [],
          );
        }),
        catchError(err => {

switchMap((params: any) => {
          if (params.code) {
            return this.requestToken(params.code);
          }

          return of(
            new NbAuthResult(
              false,
              params,
              this.getOption('redirect.failure'),
              this.getOption('defaultErrors'),
              [],
            ));
        }),
      );

switchMap((params: any) => {
          if (params.code) {
            return this.requestToken(params.code);
          }

          return of(
            new NbAuthResult(
              false,
              params,
              this.getOption('redirect.failure'),
              this.getOption('defaultErrors'),
              [],
            ));
        }),
      );