chore: scaffold carousel package and tooling

.gitignore

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+# build / tooling
+node_modules
+.yarn/*
+!.yarn/releases
+dist
+coverage
+test-results
+playwright-report
+
+# local-only docs
+docs/
+logs_llm/
+
+*.md
+!README.md

.npmrc

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+@ilia:registry=https://git.allmy.work/api/packages/ilia/npm/
+//git.allmy.work/api/packages/ilia/npm/:_authToken=${NODE_AUTH_TOKEN}

.size-limit.json

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+[
+  { "name": "core", "path": "dist/index.js", "limit": "1 KB" },
+  { "name": "dots", "path": "dist/dots.js", "limit": "0.6 KB" },
+  { "name": "autoplay", "path": "dist/autoplay.js", "limit": "0.6 KB" }
+]

.yarnrc.yml

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+nodeLinker: node-modules

biome.json

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+{
+  "$schema": "https://biomejs.dev/schemas/2.4.13/schema.json",
+  "vcs": { "enabled": true, "clientKind": "git", "useIgnoreFile": true },
+  "files": { "includes": ["src/**/*", "tests/**/*", "e2e/**/*", "*.ts", "*.json"] },
+  "formatter": { "enabled": true, "indentStyle": "space", "indentWidth": 2, "lineWidth": 120 },
+  "linter": { "enabled": true, "rules": { "recommended": true } },
+  "javascript": {
+    "formatter": {
+      "quoteStyle": "single",
+      "semicolons": "always",
+      "trailingCommas": "all"
+    }
+  }
+}

lefthook.yml

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+pre-commit:
+  parallel: true
+  commands:
+    biome-check:
+      glob: "*.{ts,json,css}"
+      run: yarn biome check --write {staged_files}
+      stage_fixed: true
+    typecheck:
+      run: yarn check
+    tests:
+      run: yarn test

package.json

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+{
+  "name": "@ilia/carousel",
+  "version": "0.0.0",
+  "type": "module",
+  "sideEffects": ["*.css"],
+  "packageManager": "yarn@4.11.0",
+  "publishConfig": {
+    "registry": "https://git.allmy.work/api/packages/ilia/npm/"
+  },
+  "exports": {
+    ".": "./dist/index.js",
+    "./dots": "./dist/dots.js",
+    "./autoplay": "./dist/autoplay.js",
+    "./carousel.css": "./src/carousel.css"
+  },
+  "files": ["dist", "src/carousel.css"],
+  "scripts": {
+    "build": "tsup",
+    "check": "tsc --noEmit",
+    "lint": "biome check .",
+    "format": "biome format --write .",
+    "test": "vitest run",
+    "test:coverage": "vitest run --coverage",
+    "test:e2e": "playwright test",
+    "size": "size-limit"
+  },
+  "devDependencies": {
+    "@biomejs/biome": "^2",
+    "@playwright/test": "^1",
+    "@size-limit/preset-small-lib": "^11",
+    "@vitest/coverage-v8": "^2",
+    "jsdom": "^25",
+    "lefthook": "^1",
+    "size-limit": "^11",
+    "tsup": "^8",
+    "typescript": "^5",
+    "vitest": "^2"
+  }
+}

src/index.ts

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+export {};

tsconfig.json

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+{
+  "compilerOptions": {
+    "target": "ES2022",
+    "module": "ESNext",
+    "moduleResolution": "bundler",
+    "strict": true,
+    "verbatimModuleSyntax": true,
+    "lib": ["ES2022", "DOM", "DOM.Iterable"],
+    "noEmit": true,
+    "skipLibCheck": true
+  },
+  "include": ["src", "tests"]
+}

tsup.config.ts

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+import { defineConfig } from 'tsup';
+
+export default defineConfig({
+  entry: ['src/index.ts', 'src/dots.ts', 'src/autoplay.ts'],
+  format: 'esm',
+  dts: true,
+  clean: true,
+  // unminified on purpose — consumer bundlers minify. size-limit measures the
+  // minified+gzipped size for budgeting.
+});

vitest.config.ts

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+import { defineConfig } from 'vitest/config';
+
+export default defineConfig({
+  test: {
+    environment: 'jsdom',
+    include: ['tests/**/*.test.ts'],
+    coverage: {
+      provider: 'v8',
+      include: ['src/**/*.ts'],
+      thresholds: { lines: 90, branches: 90, functions: 90, statements: 90 },
+    },
+  },
+});