Salesforce DX Developer Guide

How Salesforce Developer Experience Changes the Way You Work
Project Setup
Authorization
Metadata Coverage
Scratch Orgs
Development
Create a Lightning App and Components
Create an Apex Class
Create an Apex Trigger
Track Changes Between the Project and Scratch Org
Testing
View Apex Debug Logs
Apex Debugger
Build and Release Your App
First-Generation Managed Packages
Unlocked Packages and Second-Generation Managed Packages
Continuous Integration
Troubleshoot Salesforce DX
Limitations for Salesforce DX
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Create an Apex Trigger

Use Apex triggers to perform custom actions before or after a change to a Salesforce record, such as an insertion, update, or deletion. You can create Apex triggers from the CLI.
  1. If the triggers directory doesn’t exist in <app-dir>/main/default, create it.
  2. Generate skeleton trigger files by executing force:apex:trigger:create. Use the -s parameter to specify the sObject associated with this trigger, such as Account. Use the -e parameter to specify the triggering events, such as before delete or after upsert. Specify that the command generate its output into the triggers directory with the -d parameter. 
    1sfdx force:apex:trigger:create -n mytrigger -s Account -e 'before insert, after upsert' -d <app-dir>/main/default/triggers

    The command generates two files.

    • mytrigger.trigger-meta.xml—Metadata API source file
    • mytrigger.trigger—Apex source file
  3. Update the generated Apex and Metadata API source files with your code.