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You can enable debug mode for specific users. Debug mode gives you a few things, and particularly a few things that were not available previously for Aura components: Unminified JavaScript Custom formatting Developer mode console warnings Eneble Custom Formatter   from console then click on three dot ==> go to setting ==> in Console you will find enable Custom Formatter.

To communicate from child to parent, dispatch an event. Lightning web components fire DOM events. An enclosing Aura component can listen for these events, just like an enclosing Lightning web component can. In Aura, you add components into facets. In Lightning web components, you add components into slots. Facet:          <aura:component implements="flexipage:availableForAllPageTypes">           <c:lwcCompo1 />             <c:lwccompo2 />          </aura:component> Slots:          <template>               <c-lwcComp></c-lwcComp>               .....         </template> Example/Syntax: const filterChangeEvent = new CustomEvent('filterchange', { detail: { filters }, }); // Fire the custom event this.dispatchEvent(filterChangeEvent); In Aura: Component: <lightning:layout> <lightning:layoutItem size="4">

To share JavaScript code between Lightning web components and Aura components, put the code in an ES6 module. To share an ES6 module: Create an ES6 module using the Lightning Web Components programming model. To use the code in a Lightning web component, import and reference it in the component’s JavaScript file. To use the code in an Aura component, use the same syntax that you use to import an Aura component and call its methods. Create a .js file, example: extendableJS const calculateMonthlyPayment = (principal, years, rate) => { if (principal && years && rate && rate > 0) { const monthlyRate = rate / 100 / 12; const monthlyPayment = (principal * monthlyRate) / (1 - Math.pow(1 / (1 + monthlyRate), years * 12)); return monthlyPayment; } return 0; }; export { calculateMonthlyPayment }; • Create a lwc which can use your . js funct

Dependent Picklist values Dependency Dependent Picklist values do not have any dependency when retrieved via Apex Code. This Following Class will returned a map which has Key as Controlling Values and Values are the list of dependent values(In LowerCase). Map Key =  Controlling Values, Map Values = list of dependent values. Class:- /***********************-- START --****************************** **/ /** * @File Name          : DependencyForPicklistApex.cls * @Description        : CR-DR * @Author             : Devraj Tomar * @Group              : DR Groups * @Last Modified By   : Devraj Tomar * @Modification Log   :  **/ public class DependencyForPicklistApex {          public static Map<String, Set<String>> getFieldDependencies(String objectName, String controllingField, String dependentField){         Map<String, Set<String>> controllingInfo = new Map<String, Set<String>>();         Schema.SObjectType objType = Schema.getGlobalD

Summary - Salesforce Winter ’20 Release Critical Updates and Security Alerts Enable ICU(  International Components for Unicode ) Locale Formats (Critical Update) Restrict Access to @AuraEnabled Apex Methods for Guest and Portal Users Based on User Profile Restrict Access to @AuraEnabled Apex Methods for Authenticated Users Based on User Profile Use with sharing for @AuraEnabled Apex Controllers with Implicit Sharing Enforce Access Modifiers on Apex Properties in Lightning Component Markup Enable Partial Save for Invocable Actions Restrict Access to @AuraEnabled Apex Methods for Guest and Portal Users Based on User Profile  A guest, portal, or community user can access an  @AuraEnabled  Apex method only when the user’s profile allows access to the Apex class. This critical update enforces user profile restrictions for Apex classes used by Aura and Lightning web components. Restrict Access to @AuraEnabled Apex Methods for Authenticated Users Based on User Prof

1. Open a new terminal window and run the following command to install the local development server. sfdx plugins:install @salesforce/lwc-dev-server 2. Check for updates to the local development server. sfdx plugins:update 3. Navigate to your SFDX project, or clone one that has Lightning web components. In this example, we are using lwc-recipes (you can download and deploy to your org). git clone git@github.com:trailheadapps/lwc-recipes.git 4. if you have Existing LWC Components then goto that directory. In this example If you're not in the lwc-recipes root directory already, cd into it. cd lwc-recipes 5. Use the following command to host Local Server : sfdx force:lightning:lwc:start 6. View the server at http://localhost:3333/.

Apex method Call from LWC : syntax: import apexMethodName from '@salesforce/apex/Namespace.Classname.apexMethodName'; Example: public with sharing class ContactController { @AuraEnabled(cacheable=true) public static List<Contact> getContactList() { return [SELECT Id, Name, Title, Phone, Email, Picture__c FROM Contact WHERE Picture__c != null LIMIT 10]; } } Namespace = The namespace of the Salesforce organization. Classname = The Name of Apex Class apexMethodName = Method name to import apexMethodName = identify the apex method in js. Expose Apex Methods to Lightning Web Components: To expose an Apex method to a Lightning web component, the method must be static and either global or public . Annotate the method with @AuraEnabled . Primitive —Boolean, Date, DateTime, Decimal, Double, Integer, Long, and String. sObject —standard and custom sObjects are both supported. Apex —an instance of an Apex class. (Most often a custom class.) C