chore: scaffold @insignia/iios-messaging-ui with jsdom test setup

Co-Authored-By: Claude Sonnet 5 <noreply@anthropic.com>

packages/iios-messaging-ui/package.json

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+{
+  "name": "@insignia/iios-messaging-ui",
+  "version": "0.1.0",
+  "type": "module",
+  "main": "dist/index.js",
+  "module": "dist/index.js",
+  "types": "dist/index.d.ts",
+  "exports": {
+    ".": {
+      "types": "./dist/index.d.ts",
+      "import": "./dist/index.js"
+    },
+    "./adapters/mock": {
+      "types": "./dist/adapters/mock.d.ts",
+      "import": "./dist/adapters/mock.js"
+    },
+    "./conformance": {
+      "types": "./dist/conformance.d.ts",
+      "import": "./dist/conformance.js"
+    },
+    "./styles.css": "./dist/styles.css"
+  },
+  "files": [
+    "dist"
+  ],
+  "scripts": {
+    "build": "tsup",
+    "typecheck": "tsc --noEmit",
+    "test": "vitest run"
+  },
+  "peerDependencies": {
+    "react": ">=18"
+  },
+  "devDependencies": {
+    "@testing-library/dom": "^10.4.0",
+    "@testing-library/react": "^16.1.0",
+    "@types/react": "^19.0.0",
+    "jsdom": "^26.0.0",
+    "react": "^19.0.0",
+    "react-dom": "^19.0.0",
+    "tsup": "^8.3.5",
+    "typescript": "^5.7.3",
+    "vitest": "^3.0.5"
+  },
+  "publishConfig": {
+    "registry": "https://git.lynkedup.cloud/api/packages/insignia/npm/"
+  }
+}

packages/iios-messaging-ui/src/index.ts

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+export {};

packages/iios-messaging-ui/src/smoke.test.tsx

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+import { describe, it, expect } from 'vitest';
+import { render, screen } from '@testing-library/react';
+
+describe('test infrastructure', () => {
+  it('renders React components in jsdom', () => {
+    render(<div>messaging-ui</div>);
+    expect(screen.getByText('messaging-ui')).toBeDefined();
+  });
+});

packages/iios-messaging-ui/src/test-setup.ts

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+import { afterEach } from 'vitest';
+import { cleanup } from '@testing-library/react';
+
+// @testing-library/react auto-registers cleanup only when afterEach is a global.
+// We run with globals: false, so register it explicitly.
+afterEach(() => {
+  cleanup();
+});

packages/iios-messaging-ui/tsconfig.json

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+{
+  "extends": "../../tsconfig.base.json",
+  "compilerOptions": {
+    "outDir": "./dist",
+    "rootDir": "./src",
+    "module": "ESNext",
+    "moduleResolution": "bundler",
+    "lib": ["ES2022", "DOM"],
+    "jsx": "react-jsx",
+    "types": ["react"]
+  },
+  "include": ["src/**/*.ts", "src/**/*.tsx"],
+  "exclude": ["src/**/*.test.ts", "src/**/*.test.tsx"]
+}

packages/iios-messaging-ui/tsup.config.ts

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+import { defineConfig } from 'tsup';
+
+export default defineConfig({
+  // `src/adapters/mock.ts` and `src/conformance.ts` are added as separate entries
+  // in later tasks (they don't exist yet). `conformance` in particular is its own
+  // entry, never reachable from `index`, because it imports vitest, and bundling
+  // that into the main barrel would drag a test runner into every consumer's
+  // production build.
+  entry: ['src/index.ts'],
+  format: ['esm'],
+  dts: true,
+  clean: true,
+  external: ['react', 'react-dom', 'vitest'],
+});

packages/iios-messaging-ui/vitest.config.ts

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+import { defineConfig } from 'vitest/config';
+
+// This package owns its vitest config on purpose. The ROOT config includes only
+// `.ts` (never `.tsx`) and provisions a Postgres DB via globalSetup for every run —
+// a pure-UI package must not drag a database along, and its tests are .tsx.
+export default defineConfig({
+  test: {
+    environment: 'jsdom',
+    include: ['src/**/*.{test,spec}.{ts,tsx}'],
+    setupFiles: ['./src/test-setup.ts'],
+    globals: false,
+  },
+});