eslint_d

library15.0.2jsnpmunverified

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.

devops testing

npm install eslint_d

github ↗package ↗

INSTALL

IMPORT

SIG · ESLINT_D

eslint_d

devopsjavascriptv15.0.2

Install

—

Import

—

Disk

—

Pass rate

0/ 6

Env Coverage0 / 6

glibc

18–22

musl

18–22

Install & Compatibility

Where this runs

tested against v? · npm install

Install × environment matrix

Each cell = how many times install + import succeeded across repeated harness runs. Partial = flaky.
glibc = Debian/Ubuntu slim · musl = Alpine Linux

musl

node 18–226 runs

build_error

glibc

node 18–226 runs

build_error

Code

Verified usage

Verified import paths — ran on the pinned version, not inferred.

eslint_d CLI

✓ npx eslint_d --version

✗ eslint_d # must be installed globally or via npx

eslint_d is a CLI tool, not a library; use it directly in terminal or editor config.

Global installation of eslint_d and usage of its CLI commands for linting, daemon control, and fix-to-stdout.

npm install -g eslint_d # Lint a file eslint_d file.js # Start daemon explicitly eslint_d start # Status eslint_d status # Fix to stdout (requires --stdin) echo 'let x = 1' | eslint_d --stdin --fix-to-stdout # Stop daemon eslint_d stop

eslint_d --version

Debug

Known issues

breakingeslint_d v15 requires Node.js >=22. Older Node versions will not work.

fix

Upgrade Node.js to 22+ or use eslint_d v14.x if on earlier Node versions.

affects: >=15.0.0

gotchaEditors like Atom, VSCode, and WebStorm already cache ESLint; using eslint_d may not improve performance and can cause conflicts.

fix

Do not configure eslint_d in those editors; stick with built-in ESLint support.

affects: all

gotchaIf ESLINT_D_PPID is not set and ESLINT_D_IDLE is 0, the daemon may never exit automatically, consuming resources.

fix

Set ESLINT_D_PPID to 'auto' or a specific PID, or set ESLINT_D_IDLE to a positive number of minutes.

affects: all

deprecatedCommonJS require() patterns for eslint_d are deprecated; it is ESM-only since v15.

fix

Use ES module imports if using as dependency (though primarily CLI). For CLI usage, use npx or global install.

affects: >=15.0.0

Errors

Common errors & fixes

Failed to start daemon: EADDRINUSE

Another eslint_d instance or process is already using the default port.

fix

Run 'eslint_d stop' to kill the existing daemon, then restart.

eslint_d: command not found

eslint_d is not installed globally or not in PATH.

fix

Install globally: 'npm install -g eslint_d'. Or use 'npx eslint_d'.

Error: No matching ESLint version found. ESLint v10.0.0 is not supported.

eslint_d has a bundled ESLint that may not match the local project's version, or the installed ESLint version is out of support range (v4-v10).

fix

Ensure local eslint version is between 4 and 10. Update eslint or use a compatible version.

Upgrade

Version history

15.0.2latest on npm

Audit

Dependencies

eslintoptionaleslint_d wraps and calls ESLint; local or bundled version must be compatible.

Agent activity

6 hits · last 30 days

node

Resources

githubhttps://github.com/mantoni/eslint_d.js ↗

packagehttps://www.npmjs.com/package/eslint_d ↗