chore(eslint): add shared tests preset and relax no-console

A 'tests' preset exempts *.test/*.spec/*.bench files from the type-boundary rules
(no-explicit-any, no-unused-vars, no-new-array, no-extraneous-class); base now
allows intentional console.warn/error (stray console.log still flagged).

configs/eslint/src/index.ts

@@ -2,7 +2,7 @@
 export { compose } from './compose';
 
 /* Presets */
-export { base, ignores, typescript, vue, vitest, imports, node, stylistic, regexp } from './presets';
+export { base, ignores, typescript, vue, vitest, tests, imports, node, stylistic, regexp } from './presets';
 
 /* Types */
 export type {

configs/eslint/src/presets/base.ts

@@ -62,7 +62,10 @@ export const base: FlatConfigArray = [
     rules: {
       /* ── eslint core ──────────────────────────────────────── */
       eqeqeq: 'error',
-      'no-console': 'warn',
+      /* Allow intentional `console.warn`/`console.error` — used for library dev
+         diagnostics (a11y/validation warnings, often `__DEV__`-guarded). Stray
+         `console.log`/`debug`/`info` are still flagged. */
+      'no-console': ['warn', { allow: ['warn', 'error'] }],
       'no-debugger': 'error',
       'no-eval': 'error',
       'no-var': 'error',

configs/eslint/src/presets/index.ts

@@ -2,6 +2,7 @@ export { base, ignores } from './base';
 export { typescript } from './typescript';
 export { vue } from './vue';
 export { vitest } from './vitest';
+export { tests } from './tests';
 export { imports } from './imports';
 export { node } from './node';
 export { regexp } from './regexp';

configs/eslint/src/presets/tests.ts

@@ -0,0 +1,39 @@
+import type { FlatConfigArray } from '../types';
+
+/**
+ * Relaxations for test, spec and benchmark files — the type-boundary carve-outs
+ * that test scaffolding legitimately needs, applied uniformly across every
+ * package.
+ *
+ * Tests stub globals (`(globalThis as any).x`), cast `vi.fn()` mocks, build
+ * throwaway fixtures and keep deliberate sink variables; benchmarks pre-size
+ * arrays with `new Array(n)`. The `vitest` preset already grants these for its
+ * own (`it`/`expect`) ruleset, but most packages don't adopt that preset (their
+ * tests use string `describe` titles), so this small overlay carries just the
+ * relaxations — no vitest-specific style rules — and is meant to be composed
+ * LAST so it wins over the `typescript`/`stylistic` presets for these files.
+ *
+ * Source `any` is unaffected: it stays at `warn` everywhere else.
+ */
+export const tests: FlatConfigArray = [
+  {
+    name: 'robonen/tests',
+    files: [
+      '**/*.{test,spec,bench}.{ts,tsx,cts,mts,js,jsx,cjs,mjs}',
+      '**/test/**/*.{ts,tsx,js,jsx}',
+      '**/__test__/**/*.{ts,tsx,js,jsx}',
+      '**/__tests__/**/*.{ts,tsx,js,jsx}',
+    ],
+    rules: {
+      /* Test scaffolding inspects/stubs untyped boundaries; `any` is idiomatic here. */
+      '@typescript-eslint/no-explicit-any': 'off',
+      /* Sink variables, partially-used fixtures and `_`-less throwaways are fine in tests. */
+      '@typescript-eslint/no-unused-vars': 'off',
+      'no-unused-vars': 'off',
+      /* Benchmarks legitimately pre-size arrays (`new Array(n)`) for fixtures. */
+      'unicorn/no-new-array': 'off',
+      /* Empty mock/fixture classes (e.g. stubbing `class DeviceOrientationEvent {}`). */
+      '@typescript-eslint/no-extraneous-class': 'off',
+    },
+  },
+];