The LockerService API Viewer shows the DOM APIs exposed by LockerService. The API Viewer app lists the API for SecureDocument, SecureElement, and SecureWindow.
The current UI for the API Viewer is unpolished. Bear with us while we improve it. There’s a lot of information but the main takeaway is that a background green color means that the DOM method is supported.
Use the Salesforce Lightning CLI tool to scan your code for Lightning-specific issues.
The reference doc app lists the API for SecureComponent under
.SecureAura is the wrapper for $A.
Access the reference doc app at:
https://<myDomain>.lightning.force.com/auradocs/reference.app, where <myDomain> is the name of your custom Salesforce domain.