Prettier is an opinionated JavaScript formatter with advanced support for language features from ES2017, JSX, and Flow. It removes all original styling and ensures that all outputted JavaScript conforms to a consistent style.
This goes way beyond ESLint and other projects built on it. Unlike ESLint, there aren’t a million configuration options and rules. But more importantly: everything is fixable. This works because Prettier never “checks” anything; it takes JavaScript as input and delivers the formatted JavaScript as output.
In technical terms: Prettier parses your JavaScript into an AST (Abstract Syntax Tree) and pretty-prints the AST, completely ignoring any of the original formatting. Say hello to completely consistent syntax!