Salesforce DX Developer Guide

How Salesforce Developer Experience Changes the Way You Work
Use a Sample Repo to Get Started
Create an Application
Migrate or Import Existing Source
Enable Dev Hub Features in Your Org
Project Setup
Authorization
Metadata Coverage
Scratch Orgs
Sandboxes
Track Changes Between Your Project and Org
Development
Build and Release Your App
First-Generation Managed Packages
Second-Generation Managed Packages
Unlocked Packages
Continuous Integration
Troubleshoot Salesforce DX
Limitations for Salesforce DX
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Use a Sample Repo to Get Started

The quickest way to get going with Salesforce DX is to clone the dreamhouse-lwc GitHub repo. Use its configuration files and Salesforce application to try some commonly used Salesforce CLI commands.
  1. Open a terminal or command prompt window, and clone the dreamhouse-lwc GitHub sample repo using HTTPS or SSH. 
    1git clone https://github.com/trailheadapps/dreamhouse-lwc.git
2--or--
3git clone git@github.com:trailheadapps/dreamhouse-lwc.git
  2. Change to the dreamhouse-lwc project directory. 
    1cd dreamhouse-lwc
  3. Authorize your Developer Hub (Dev Hub) org, set it as your default, and assign it an alias. 
    1sfdx auth:web:login --setdefaultdevhubusername --setalias DevHub
    Enter your Dev Hub org credentials in the browser that opens. After you log in successfully, you can close the browser.
  4. Create a scratch org using the config/project-scratch-def.json file, set the username as your default, and assign it an alias. 
    1sfdx force:org:create --setdefaultusername -f config/project-scratch-def.json --setalias my-scratch-org
  5. Push source and tests, located in the force-app directory, to the scratch org. 
    1sfdx force:source:push
  6. Assign the dreamhouse permission set to the default user. 
    1sfdx force:user:permset:assign -n dreamhouse
  7. Import sample data into the scratch org. 
    1sfdx force:data:tree:import -p data/sample-data-plan.json
  8. Run Apex tests. 
    1sfdx force:apex:test:run --resultformat human
  9. Open the scratch org and view the pushed metadata under Most Recently Used. 
    1sfdx force:org:open
  10. In App Launcher, find and open Dreamhouse.