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Salesforce Lightning Web Component Cookbook

Name: Salesforce Lightning Web Component Cookbook
Author: Evelyn Maguire
ISBN: 9781835469866

by Evelyn Maguire

March 2026

Intermediate to advanced

512 pages

11h 26m

English

Packt Publishing

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Preface
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Part 1: The Basics of Lightning Web Component Development
Chapter 1: Getting Ready for Lightning Web Component Development
Technical requirementsForking the repositoryHow to do it…Setting up VSCode on WindowsHow to do it…Setting up VSCode on macOSHow to do it…Setting up Salesforce Code BuilderHow to do it…Retrieving and deploying metadata from SalesforceHow to do it…How it works…There's moreSee alsoLinting for SalesforceHow to do it…See alsoSetting up the Salesforce Lightning Web Components Cookbook orgHow to do it…Building your first LWCHow to do it…There's moreSee also
Chapter 2: Writing Apex for Lightning Web Components
Technical requirementsBuilding your next LWCHow to do it…See alsoWriting Apex classes for LWCsHow to do it…See alsoWrapper classesHow to do it…See alsoThe @AuraEnabled annotationHow to do it…See alsoImporting methods, objects, and fields into LWCsHow to do it…See alsoCalling Apex methods from LWCsHow to do it…See alsoThrowing exceptionsHow to do it…See alsoBringing it all togetherHow to do it…See also
Chapter 3: Working with a Selector Class
Technical requirementsBuilding a SOQL and SOSL utility classGetting readyHow to do it…See alsoConnecting to the database with a selector classHow to do it...See alsoPerforming business logic with a service classHow to do it…See alsoExposing a wrapper with a controller classHow to do it…See alsoBuilding a selector-friendly LWCHow to do it...There's more…See alsoGet this book's PDF version and more
Part 2: Intermediate JavaScript Topics in LWC Development
Chapter 4: Synchronous and Asynchronous Processing in Components
Technical requirementsReturning @AuraEnabled sObjectsGetting readyHow to do it...See alsoAsynchronous processing in LWCsHow to do it…How it works…Async and await functionsHow it works…Promise chainSee alsoSynchronous processing in LWCsHow to do it...See alsoReusable utility componentsHow to do it...See alsoGet this book's PDF version and more
Chapter 5: Accessing External Data Sources via Lightning Web Components
Technical requirementsWriting REST APIs in ApexHow to do it…See alsoDeserializing JSON results into wrappersHow to do it…See alsoSerializing wrappers into JSONHow to do it…See alsoDisplaying retrieved dataHow to do it…See alsoParsing JSON into JavaScript objectsHow to do it…See alsoUtilizing the fetch API in JavaScriptHow to do it…See alsoGet this book's PDF version and more
Chapter 6: Composing Lightning Web Components
Technical requirementsWorking with the shadow DOMHow to do it…See alsoBuilding child componentsHow to do it…See alsoBuilding parent componentsHow to do it…See alsoCommunication from parent to childHow to do it…See alsoCommunication from child to parent through eventsHow to do it…See alsoHandling events in the parent componentHow to do it…See alsoConfiguring event propagation from child to parentHow to do it…See alsoSibling component communicationHow to do it…Get this book's PDF version and more
Chapter 7: Building Secure Components with Lightning Locker and Lightning Web Security
Technical requirementsLightning security architecture basicsGetting startedHow to do it…How it works…See alsoComposing modal events with Lightning LockerHow to do it…How it works…See alsoEnforcing Lightning web security with ESLintHow to do it…See alsoPreparing to upgrade from Lightning Locker to Lightning Web SecurityHow to do it…How it works…See also

Part 3: Building Custom Lightning Web Components
Chapter 8: Implementing Reactivity in Lightning Web Components
Technical requirementsWriting Apex for lazy loadingGetting startedHow to do it…See alsoConfiguring LWCs for different form factorsHow to do it…There's moreSee alsoEnabling lazy loading via infinite scrollGetting startedHow to do it…There's moreSee alsoBuilding a DOM reactive LWCHow to do it…See alsoWorking with media queriesHow it works…See also
Chapter 9: Creating Custom Lightning Web Components
Technical requirementsExtending base components for added functionalityHow to do it…See alsoModifying existing components in placeHow to do it…See alsoEditing and saving the datatable row valuesHow to do it…See alsoGet this book's PDF version and more
Chapter 10: Designing Polymorphic Lightning Web Components
Technical requirementsExpressing complex object models using wrappersGetting startedHow to do it…See alsoPolymorphism in ApexHow to do it…See alsoArranging SLDS elementsHow to do it…See alsoReusing custom componentsHow to do it…See alsoInserting a custom component into a datatable columnHow to do it…See alsoUtilizing polymorphic Apex classesHow to do it…See alsoGet this book's PDF version and more
Chapter 11: Writing Accessible Lightning Web Components
Technical requirementsWhy should we care about making our applications accessible?Testing behavior across operating systems and browsersGetting startedHow to do it…See alsoApplying accessibility principles to custom LWCsHow to do it…See alsoWriting it right: avoiding common pitfallsHow to do it…See alsoGet this book's PDF version and more
Part 4: Preparing Lightning Web Components for Production
Chapter 12: Migrating Aura to Lightning Web Components
Technical requirementsDeciding when to migrate and with what toolsGetting startedHow to do it…See alsoTranslating Lightning components into LWCsGetting startedHow to do it…How it works…See alsoRewriting JavaScript for LightningHow to do it…See alsoGet this book's PDF version and more
Chapter 13: Testing Apex with Mocking and Stubbing
Technical requirementsMocking query resultsHow to do it…See alsoImplementing the stub providerHow to do it…See alsoUnit testing with the stub providerGetting startedHow to do it…See alsoUtilizing apex-mockery for unit testingapex-mockery licensed under a BSD 3-Clause, available here:Getting startedHow to do it…See alsoGet this book's PDF version and more
Chapter 14: Testing Lightning Web Components with Jest
Technical requirementsSetting up for testing with JestGetting startedHow to do it…See alsoWriting tests using matchersGetting startedHow to do it…See alsoMocking controller methodsHow to do it…There's moreSee alsoTesting asynchronous JavaScriptHow to do it…See alsoChecking element attributesHow to do it…See also
Chapter 15: Debugging Lightning Web Components
Technical requirementsWorking with common debugging toolsHow to do it…There's moreSee alsoKnowing the limitations of debugging toolsGetting startedHow to do it…See alsoPreventing common errors in ApexGetting startedHow to do it…See alsoHandling common errors in LWCsGetting startedHow to do it…See alsoDealing with null pointer exceptionsGetting startedHow to do it…See alsoGet this book's PDF version and more
Chapter 16: Unlock Your Exclusive Benefits
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Index

Content preview from Salesforce Lightning Web Component Cookbook

14 Testing Lightning Web Components with Jest

Now that we have learned about several methods for testing the Apex that we pair with Lightning Web Components, it's time to test the components themselves. To do this, we will focus on some of the code that we have already written, namely the components we wrote for Chapter 3, Working with a Selector Class, and Chapter 4, Synchronous and Asynchronous Processing in Components. The tests for these two chapters will give us an idea of what needs to happen when we write our frontend tests.

We are going to be covering the following main recipes:

Setting up for testing with Jest
Writing tests using matchers
Mocking controller methods
Testing asynchronous JavaScript
Checking element attributes

Technical ...

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Salesforce Lightning Web Component Cookbook

by Evelyn Maguire

14

Testing Lightning Web Components with Jest

Technical ...

Become an O’Reilly member and get unlimited access to this title plus top books and audiobooks from O’Reilly and nearly 200 top publishers, thousands of courses curated by job role, 150+ live events each month,
and much more.