Online IDE's like stackblitz
Libraries like React after its newer release 16.3 , VueJS
React Ecosystem in total
Serverless Hosting for PWA's and Mobile Apps(AWS AppSync , AWS Lambda and Firebase).
Code Formating (parceljs, prettier etc..)
Thats all I know. Anything Else i missed?
Just GraphQL and Headless Chrome. There is a project called Puppeteer that makes it easier to work with headless Chrome.
It's not entirely Front End but definitely it is a thing.
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