What is preset?

Question

webpack

Setting up webpack ran into babel. What is preset in babel ? and what is the difference from polyfill

Answer 1

Don't want to assemble your own set of plugins? No problem! Presets can act as an array of Babel plugins or even a sharable options config.

https://babeljs.io/docs/en/presets/
Presets are some kind of ready-made setting. Polyfill is a crutch for the browser. These are completely different things. But there are presets with polyfills.