chore: add typed ESLint checks #18

Refs WealthLedger/main#18. Keep Biome; add no Prettier dependencies.

scripts/test-eslint.mjs

@@ -0,0 +1,64 @@
+import assert from "node:assert/strict";
+import { test } from "node:test";
+import { ESLint } from "eslint";
+
+test("ESLint enforces the frontend profile and excludes generated artifacts", async () => {
+	const eslint = new ESLint();
+	for (const [filePath, code, rule] of [
+		[
+			"src/shared/api/problem-details.ts",
+			"export function run() { Promise.resolve(); }",
+			"@typescript-eslint/no-floating-promises",
+		],
+		[
+			"packages/ui/src/EntryCard/EntryCard.tsx",
+			'import { useState } from "react"; export function Example({ active }: { active: boolean }) { if (active) useState(0); return null; }',
+			"react-hooks/rules-of-hooks",
+		],
+		[
+			"src/shared/api/problem-details.ts",
+			"export const values = Array(3).fill({});",
+			"unicorn/no-array-fill-with-reference-type",
+		],
+		[
+			"src/shared/api/problem-details.ts",
+			"export default 1;",
+			"import-x/no-default-export",
+		],
+		[
+			"src/shared/api/client.test.ts",
+			'import { it } from "vitest"; it.only("focused", () => {});',
+			"vitest/no-focused-tests",
+		],
+		[
+			"packages/ui/src/EntryCard/EntryCard.test.tsx",
+			'import { screen } from "@testing-library/react"; screen.findByText("ready");',
+			"testing-library/await-async-queries",
+		],
+		[
+			"packages/ui/src/EntryCard/EntryCard.tsx",
+			'import { QueryClient } from "@tanstack/react-query"; export function Example() { const client = new QueryClient(); return <div>{String(client)}</div>; }',
+			"@tanstack/query/stable-query-client",
+		],
+	]) {
+		const [result] = await eslint.lintText(code, { filePath });
+		assert.equal(result.fatalErrorCount, 0, filePath);
+		assert.ok(
+			result.messages.some((message) => message.ruleId === rule),
+			rule,
+		);
+	}
+	for (const file of [
+		"src/shared/api/generated/schema.d.ts",
+		"packages/ui/dist/index.js",
+		"storybook-static/index.js",
+		"coverage/index.js",
+	])
+		assert.equal(await eslint.isPathIgnored(file), true, file);
+	const story = await eslint.calculateConfigForFile(
+		"src/shared/ui/Button.stories.tsx",
+	);
+	assert.equal(story.rules["import-x/no-default-export"][0], 0);
+	assert.ok(story.rules["storybook/default-exports"][0] > 0);
+	assert.equal(story.rules["react-refresh/only-export-components"], undefined);
+});