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Re:Four Eras of JavaScript Frameworks by sa46 on Wednesday April 27, 2022 @03:59PM (#31184980)
GWT was replaced by the similar J2CL and is used for GMail, Inbox, Docs, Slides and Calendar.
Re:Four Eras of JavaScript Frameworks by cmrdporcupine on Wednesday April 27, 2022 @04:20PM (#31185223)
I wasn't on the gmail team but my understanding from friends that were is that the Java transpilation in Gmail is for the backend, to share model and business logic, not the frontend.

GMail, AFAIK, never used GWT for its UI