Salesforce DX Developer Guide

How Salesforce Developer Experience Changes the Way You Work
Salesforce CLI Configuration and Tips
Project Setup
Authorization
Metadata Coverage
Scratch Orgs
Sandboxes
Development
Develop Against Any Org
Create Lightning Apps and Aura Components
Create Lightning Web Components
Create an Apex Class
Create an Apex Trigger
Testing
View Apex Debug Logs
Apex Debugger
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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Create Lightning Web Components

To create a Lightning web component from the CLI, you must have an lwc directory in your Salesforce DX project.
  1. In <app dir>/main/default, create the lwc directory.
  2. Change to the lwc directory.
  3. In the lwc directory, create the Lightning web component. 
    1sfdx force:lightning:component:create --type lwc -n myLightningWebComponent