eslint_d

eslint_d is a drop-in replacement for ESLint that runs linting in a persistent background daemon, drastically reducing startup latency (e.g., ~300ms to ~100ms per run on modern hardware). Version 15.0.2 requires Node.js >=22 and supports ESLint v4 through v10. It automatically starts, stops, and restarts the server, binds to parent/editor processes, and falls back to a bundled ESLint if a local one is missing. Key differentiators include environment variables for fine-tuning behavior, support for monorepos via `ESLINT_D_ROOT`, and a `--fix-to-stdout` option for editor integration. Unlike editor-built-in caches, it provides speed benefits to Vim, Neovim, Emacs, and Sublime Text, while Atom, VSCode, and WebStorm gain little due to their own caching.