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Build your apps everywhere with LWC OSS

Fabien Taillon - 8x Salesforce MVP - CTO at Texeï - Paris Developer Group leader - French Touch Dreamin team - Serial speaker - Not so serial blogger @FabienTaillon https://texei.com/blog

● What’s Open Sourced at Salesforce ● What’s available as a public package ● What can be done ● Let’s build something with Lightning Web Runtime ● Demo ● Differences between OSS & Platform Agenda

A whole site dedicated to OSS (open source software): https://opensource.salesforce.com Some OSS Projects: ● Lightning Web Components ● Salesforce Extensions for VS Code ● Salesforce Lightning Design System ● oclif ● … Not something new, Aura was already open source. What’s Open Sourced at Salesforce

Some other projects are not open sourced, but available as packages (npm) for us to use: ● Lightning Web Runtime ● Lightning Base Components ● … What’s available as a public package

Benefit from all publicly available resources to build your own application locally, hosted wherever you want: ● Lightning Web Runtime ● Lightning Web Components ● Salesforce Lightning Design System ● Lightning Base Components What can be done

Benefit from all publicly available resources to build your own application locally, hosted wherever you want: ● Lightning Web Runtime ● Lightning Web Components ● Salesforce Lightning Design System ● Lightning Base Components ● Custom @wire api What can be done

Benefit from all publicly available resources to build your own application locally, hosted wherever you want: ● Lightning Web Runtime ● Lightning Web Components ● Salesforce Lightning Design System ● Lightning Base Components ● Custom @wire api ● Use Lightning Navigation Service What can be done

Benefit from all publicly available resources to build your own application locally, hosted wherever you want: ● Lightning Web Runtime ● Lightning Web Components ● Salesforce Lightning Design System ● Lightning Base Components ● Custom @wire api ● Use Lightning Navigation Service ● Use OSS first/only features (Light DOM, dynamic component creation) What can be done

Benefit from all publicly available resources to build your own application locally, hosted wherever you want: ● Lightning Web Runtime ● Lightning Web Components ● Salesforce Lightning Design System ● Lightning Base Components ● Custom @wire api ● Use Lightning Navigation Service ● Use OSS first/only features (Light DOM, dynamic component creation) ● Any tool of your choice (Rollup, webpack, TypeScript…) What can be done

● LWR is a runtime built with performance in mind ● Loads modules/services, like routing ● Used by the latest Experience Cloud templates ● Configurable via lwr.config.json Easy to start with: npm init lwr https://developer.salesforce.com/docs/platform/lwr/overview Let’s build something with Lightning Web Runtime

● npm install @salesforce-ux/design-system ● Copy node_modules/@salesforce-ux/design-system/assets/sty les/salesforce-lightning-design-system.min.css to assets/styles/salesforce-lightning-design-system.min.css (or script it) Add SLDS

● Create src/layouts/main.html ○ see template here: https://developer.salesforce.com/docs/platform/lwr/ guide/lwr-slds.html ● Add stylesheet link https://developer.salesforce.com/docs/platform/lwr/guid e/lwr-slds.html Add SLDS

Add synthetic shadow to lwr.config.json SLDS needs Synthetic Shadow

● npm install lightning-base-components ● Add "npm": "lightning-base-components" to lwr.config.json Add Lightning Base Components

Add routes to lwr.config.json Server-side Routing

Add routes in main app, and define handler function: Client-side Routing

Add lwr-router-container to main app template import { createRouter } from 'lwr/router'; Client-side Routing

Basically just an ES6 module with a few functions: ● constructor ● connect ● disconnect ● Update https://lwc.dev/guide/wire_adapter Custom @wire

DEMO

● Custom images/assets vs static resources (different import) ○ OSS: just add files to src/assets folder ○ Platform: import myResource from '@salesforce/resourceUrl/resourceReference'; ● Custom @wire → not allowed on Platform, replaced by Apex Class ○ OSS: import { getUser } from 'c/usersWireApi'; ○ Platform: import getUser from '@salesforce/apex/Namespace.UsersWireApi.getUser'; Differences between OSS & Platform

● Navigation page names ○ OSS: whatever name you would like (eg. “namedPage”) ○ Platform: page names expected by Salesforce (ex: comm__namedPage) ● Metadata file (myComponent.js-meta.xml) ○ OSS: No need, but won’t complain if the file is there ○ Platform: expected by Salesforce, Differences between OSS & Platform

● Presentational components ● No Salesforce only import ● Navigation is OK ● Was designed to work everywhere from the start ○ Use Salesforce expected page names ● Won’t fit for all components Components suited to use everywhere

LWC: ● https://lwc.dev ● https://github.com/salesforce/lwc LWR: ● https://developer.salesforce.com/docs/platform/lwr/over view SLDS: ● https://www.lightningdesignsystem.com ● https://github.com/salesforce-ux/design-system Resources

Demo projects GitHub repositories: https://github.com/FabienTaillon/lwc-lwr-oss https://github.com/FabienTaillon/lwc-oss-on-platform Create Components Dynamically in LWC OSS: https://www.youtube.com/watch?v=KYRGmilJOrM Resources

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