The following information is handy for developer when customizing Dynamics 365 with Javascript.
The following client APIs are Deprecated in the current release to reorganize the Xrm client, so replacement client API need to be used and the Deprecated Client APIs are continue to be supported unless the Microsoft issue the time limit to replace with new Client APIs
For the replacement of the Xrm Client APIs please refer to Microsoft document
https://docs.microsoft.com/en-us/dynamics365/get-started/whats-new/customer-engagement/important-changes-coming#some-client-apis-are-deprecated
I hope this helps..
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