Lightning Components Developer Guide

What is the Lightning Component Framework?
Quick Start
Creating Components
Using Components
Communicating with Events
Creating Apps
Styling Apps
Developing Secure Code
What is Locker Service?
JavaScript ES5 Strict Mode Enforcement
DOM Access Containment
Secure Wrappers
Access to Supported JavaScript API Framework Methods Only
What Does Locker Service Affect?
Disabling Locker Service for a Component
Don’t Mix Component API Versions
Locker Service Disabled for Unsupported Browsers
Content Security Policy Overview
Using JavaScript
Using Apex
Lightning Data Service
Testing Components with Lightning Testing Service
Debugging
Fixing Performance Warnings
Reference
PDF

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Disabling Locker Service for a Component

You can disable Locker Service for a component by setting API version 39.0 or lower for the component. If a component is set to at least API version 40.0, Locker Service is enabled. API version 40.0 corresponds to Summer ’17, when Locker Service was enabled for all orgs.

Locker Service is disabled for any component created before Summer ’17 because these components have an API version less than 40.0.

Component versioning enables you to associate a component with an API version. When you create a component, the default version is the latest API version. In Developer Console, click Bundle Version Settings in the right panel to set the component version.

For consistency and ease of debugging, we recommend that you set the same API version for all components in your app, when possible.