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jwinterm e1ea0ce18c chore(lint): migrate off next lint to the ESLint CLI and flat config
`next lint` is deprecated and disappears in Next 16. apps/web now runs
`eslint .` against eslint.config.mjs on ESLint 9, and the shared preset moves
to packages/config/eslint-preset.mjs. eslint-config-next 15 still ships only
an eslintrc-style config, so FlatCompat translates it; that keeps
next/core-web-vitals as the single source of rules.

The migration was done by hand rather than via @next/codemod, because the
codemod does not know about the shared @repo/config preset.

Two things worth knowing.

ESLint 9 only walks file extensions that some config names in `files`. The
first working version of this config linted three loose .js files, skipped
every .tsx in src/, and still exited 0 -- a green run that checked nothing.
The preset now names the extensions explicitly. Coverage went from 3 files to
82, and a deliberately broken canary component confirms rules still fire.

`@eslint/eslintrc` also needed a second scoped override: it does a default
import of minimatch and declares ^3.1.2, which the global ^9.0.7 audit
override broke. Same shape as the ajv fix in the previous commit.
2026-08-17 06:06:14 -04:00

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JavaScript

import { dirname } from "node:path";
import { fileURLToPath } from "node:url";
import { FlatCompat } from "@eslint/eslintrc";
// eslint-config-next 15 still ships only an eslintrc-style config (no flat export),
// so FlatCompat translates it. baseDirectory is THIS package, because that is where
// eslint-config-next is declared and therefore resolvable from.
const compat = new FlatCompat({
baseDirectory: dirname(fileURLToPath(import.meta.url)),
});
/** Shared flat config for every app in the monorepo. */
const config = [
// ESLint 9 only walks extensions that some config names in `files`. Without this,
// `eslint .` silently lints the three loose .js files and skips all of src/*.tsx
// while still exiting 0 -- a green run that checked nothing.
{ files: ["**/*.{js,jsx,mjs,cjs,ts,tsx}"] },
...compat.extends("next/core-web-vitals"),
{
rules: {
// strict accessibility rules will go here later
},
},
];
export default config;