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dextmorgn a33705271f chore(frontend): migrate eslintrc to flat config (eslint.config.ts)

.eslintrc.cjs + .eslintignore replaced by a single eslint.config.ts.
Requires ESLint 9 — flat config's TS-file loading and the plugins'
flat presets aren't available on 8.x, and v8 -> v9 is the only jump
that's actually clean: eslint-plugin-react (react/recommended,
jsx-runtime, and the two rules this project deliberately disables —
prop-types, display-name) hard-crashes on ESLint 10 (calls the
removed context.getFilename() API, confirmed by trying it — no
released or canary version fixes this). eslint-plugin-react-hooks and
typescript-eslint both declare and work fine on 10, but react doesn't,
so 9.39.5 is the newest version where all three plugins actually work
together. Every devDependency in this stack now pinned to an exact
version rather than a caret range, deliberately: this exact
combination is what got verified, and a silent minor/patch bump on
any one of them is exactly how this session hit the v10 breakage.

Rule set is unchanged, not just reorganized — verified the finding
count is identical before/after (129 problems: 0 errors, 129
warnings; 112 of them no-explicit-any, matching the pre-migration
count exactly) by resolving each plugin's flat preset explicitly
(tsPlugin.configs['flat/recommended'], react.configs.flat.recommended
+ ['jsx-runtime'], reactHooks.configs.flat.recommended — the plain
.recommended, not recommended-latest, since eslintrc's
'plugin:react-hooks/recommended' resolved to that same rule set, not
the newer superset) instead of guessing at equivalents. tsc --noEmit
output is also byte-identical before/after.

package.json's lint/lint:check scripts drop the now-meaningless --ext
flag — flat config determines matched files via the config's own
`files` patterns, not CLI extension lists (confirmed harmless either
way, but keeping it would just be dead noise). CI's per-file ratchet
invocation (yarn eslint <files>) and lint-staged's prettier-only setup
are untouched — neither depended on the config file format.

2026-08-25 09:33:37 +02:00