Discovering the power of chaining operators in RxJS 6 by encapsulating .map within

I am in the process of updating my Observable code from RXJS 5 to version 6.

import { Injectable } from '@angular/core';
import { Observable } from 'rxjs'
import { AppConfig } from '../config/app-config';
import { Xapi } from 'x-lib';
import { ClicksActive, ClicksBalance } from '../models/user.model';
import { getLambdaErrorMessage } from "../helpers/lambda-error.helper";
import { map } from 'rxjs/operators';
import { catchError } from 'rxjs/operators';


@Injectable(
    { providedIn: 'root' }
)
export class ClicksService {

    constructor() {
    }

    requestActive(
        idNumber: String
    ): Observable<ClicksActive> {

        let parameters =
        {
            apiUsername: this.getApiUsername(),
            apiPassword: this.getApiPassword(),
            apiBaseUrl: this.getApiBaseUrl(),
            idNumber: idNumber
        }

        return Xapi.addTransaction('clicksActive', parameters, { timeout: AppConfig.OTP_REQUEST_TIMEOUT, queue: false })
        .pipe(map(res => {
            let response = res.data;
            let clicksActive: ClicksActive = this.parseActiveResponse(response);
            return clicksActive;
        }), catchError((error) => {
            let errorMessage = getLambdaErrorMessage(error);
            let clicksActive: ClicksActive = {
                success: false,
                active: false,
                errorMessage: errorMessage
            }

            return Observable.of(clicksActive);
        })
        )
    }

    parseActiveResponse(response): ClicksActive {
        let clicksActive: ClicksActive = {
            success: response.success,
            active: response.active,
            errorMessage: response.errorMessage
        }
        return clicksActive;
    }

...

To provide some context, here is an overview of how Xapi functions:

import { ApiTransactions } from "./api.model";
export declare class Xapi {
    private static transactions;
    private static timeoutCheckInterval;
    constructor();
    /**
     * Add transaction to be processed
     *
     * @param {string} lambda
     * @param {object} request
     * @param opts
     * @returns {Observable<any>}
     */
    addTransaction(lambda: string, request: object, opts?: any): Observable<any>;
    /**
     * Get all transactions
     *
     * @returns {ApiTransactions}
     */
    static getTransactions(): ApiTransactions;
    /**
     * Process transaction response
     *
     * When the transaction comes back from the lambdas, process it.
     *
     * @param rx
     */
    static transactionResponse(rx: any): void;
   
    ... (additional methods)
}
export declare let Xapi: Xapi;

This then leads to invoking clicksActive.js - involving an AJAX request:

class ClicksActive {
    
    ... (implementation details)

}

//The following binds the Lambda to the Xapi Lambda Agent to commence receiving transactions
require('./at/lambda').bind(ClicksActive);

Despite wrapping map into pipe, I am encountering difficulties in getting it to function as intended.

return Xapi.addTransaction('clicksActive', parameters, { timeout: AppConfig.OTP_REQUEST_TIMEOUT, queue: false })
        .pipe(map(res => {
            let response = res.data;
            let clicksActive: ClicksActive = this.parseActiveResponse(response);
            return clicksActive;
        })

The error message displayed states:

Argument of type 'OperatorFunction<any, ClicksActive>' is not assignable to parameter of type 'UnaryFunction<Observable, Observable>'. Types of parameters 'source' and 'source' are incompatible.

I am utilizing RXJS 6 along with Angular 11 and Ionic 5.

If anyone has advice or guidance on pointing me towards the correct direction, it would be greatly appreciated.

Answer №1

Summary

Check out the recommendations below:

Replace the line

return Observable.of(clicksActive);
with return of(clicksActive);

Don't forget to include the necessary import statement

import { of } from 'rxjs'

In rxjs version 6 and above, we utilize the static operator of. For more information, refer to the of documentation

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