ESLint Config Inspector

ESLint Config Inspector is a visual tool for an ESLint flat config. The README says you run it from a project that has eslint.config.js, then open a local page and read the resolved config. Checked 4 November 2026 on main at 03bc97da7f2241b2b31f39cf504fcf8432767bc4. This note did not clone the repo, did not install the package, and did not start the server.

Who publishes it

The GitHub API the same day reported the ESLint organization, not a fork, created 29 March 2024, pushed 4 November 2026 at 08:13 UTC, default branch main, language TypeScript, 1392 stars, 61 forks, 13 open issues, and 6 subscribers. The description is "A visual tool for inspecting and understanding your ESLint flat configs." Topics are devframe, devtools, eslint, eslint-flat-config, and visual-inspector. The homepage field is the npm page for @eslint/config-inspector. License SPDX is Apache-2.0.

HEAD is "docs: Update README sponsors", authored by GitHub Actions Bot on 4 November 2026 at 08:13 UTC. The commit API lists one file, README.md. package.json on that commit is still version 3.5.0.

GitHub release v3.5.0 was published 16 September 2026. npm latest is the same version, published 16 September 2026 at 05:25 UTC. The registry created the package on 29 March 2024. Maintainer names on the 3.5.0 document are openjsfoundation and eslintbot. The unpacked tarball metadata says 51 files and 1776856 bytes.

LICENSE on main is the Apache License 2.0 text. package.json and the npm document both say Apache-2.0.

Where the code lives

The root of main includes app, src, shared, tests, bin.mjs, package.json, nuxt.config.ts, and uno.config.ts. bin.mjs is four lines. It imports ./dist/cli.mjs. The package bin field points both @eslint/config-inspector and eslint-config-inspector at ./bin.mjs.

The README names the stack. pnpm manages packages. Nuxt and Vue are the app. devframe is the dev server, the RPC transport, and the static build. UnoCSS does the styling, with attributify mode. ESLint lints and formats. package.json scripts match that. dev is nuxt dev. build is nuxt build && tsdown. start is node bin.mjs.

Workspace dependencies in package.json use the pnpm catalog: protocol. The published 3.5.0 tarball pins cac ^7.0.0, jiti ^2.7.0, ansis ^4.4.0, chokidar ^5.0.0, devframe ^1.0.0, tinyglobby ^0.2.17, and @devframes/agentic ^1.0.0. This check did not open the workspace catalog, so those ranges are the published package, not a diff against main.

engines.node is ^20.19.0 || ^22.13.0 || >=24. The peer dependency is eslint at ^8.50.0 || ^9.0.0 || ^10.0.0. The README describes the tool as a viewer for flat configs. It does not say which of those ESLint majors enable flat config.

How a session starts

The README says to go to the project root and run pnpx @eslint/config-inspector, then visit http://localhost:7777. It says changes to the config file update automatically. Run pnpx @eslint/config-inspector --help for options. Those commands were not run.

src/cli.ts on the same commit defines three commands with cac. The default command is "Start dev inspector". Its defaults are host process.env.HOST or 127.0.0.1, port process.env.PORT or 7777, --open true, --files true, and --stats false. --no-open turns the browser open off. --config selects a config file. --basePath is the base directory for globs, and the option text says it defaults to the config file's directory when omitted.

build writes a static SPA. The default output directory is dist/__eslint-config-inspector. --base defaults to /. --stats defaults to false, and the option text says a true value runs stats analysis and includes it in the build. The README says this build is a snapshot of the current ESLint config.

mcp is a third command. The source string says it starts an MCP server for coding agents over stdio, and it marks that command experimental. The README usage section read here does not mention mcp.

Gotchas

--files defaults to true on both the dev server and the static build. The option text says that includes matched file paths in the payload. A deployed snapshot can therefore contain those paths. This check did not inspect a generated payload.

--open defaults to true, so a normal start asks the tool to open a browser. The README prints localhost, while the CLI default host is 127.0.0.1.

pnpm dev is the Vue hot-reload loop. The README says the payload fetch fails unless the inspector is already running. The command it gives for the inspector during development is pnpm cli:dev.

The peer range includes ESLint 8.50, 9, and 10. This check did not load a config from each major.

What this check did not do

No clone, no pnpm install, no pnpx, and no browser session on port 7777 or on the StackBlitz link in the README. The sponsor logos after the license heading were not copied. The workspace catalog was not opened.