ESLint

ESLint is the wildly explosive, absolutely dominant open-source apex predator of the "JavaScript Ecosystem." It explicitly rejects enterprise bloat in favor of terrifyingly modular, developer-centric linting. It is the absolute weapon of choice for literally every modern frontend engineering team on earth who mathematically demand a highly customizable ruleset that physically forces 50 different developers to write React code with the exact same mathematical style, catching errors before compilation.