chore: establish learning module baseline

OpenMAIC/tests/video-export/eslint-boundary.test.ts

@@ -0,0 +1,43 @@
+import { ESLint } from 'eslint';
+import { describe, expect, it } from 'vitest';
+
+const BOUNDARY_RULE = 'no-restricted-syntax';
+const eslint = new ESLint({ cwd: process.cwd() });
+
+async function boundaryErrors(code: string): Promise<string[]> {
+  const filePath = 'lib/video-export/emit-hyperframes/probe.ts';
+  if (await eslint.isPathIgnored(filePath)) return ['<path is eslint-ignored>'];
+  const [result] = await eslint.lintText(code, { filePath, warnIgnored: false });
+  return (result?.messages ?? [])
+    .filter((message) => message.severity === 2 && message.ruleId === BOUNDARY_RULE)
+    .map((message) => message.ruleId ?? 'unknown');
+}
+
+describe('Hyperframes emitter lint boundary', () => {
+  it('allows only in-module relatives and the shared pure Quiz math renderer', async () => {
+    const errors = await boundaryErrors(`
+      import type { VideoTimeline } from '../ir';
+      import { renderQuizMathText } from '../../quiz/math-text';
+      import { escapeHtml } from './format';
+      export type Timeline = VideoTimeline;
+      export const rendered = renderQuizMathText(escapeHtml('x'));
+    `);
+
+    expect(errors).toEqual([]);
+  });
+
+  it.each([
+    ['a host-app alias', "import value from '@/lib/store'; export default value;"],
+    ['another app module', "import value from '../../store'; export default value;"],
+    [
+      'a named re-export from another app module',
+      "export { default as value } from '../../store';",
+    ],
+    ['a star re-export from another app module', "export * from '../../store';"],
+    ['React', "import React from 'react'; export default React;"],
+    ['a dynamic import', "export async function load() { return import('./format'); }"],
+    ['require', "const format = require('./format'); export default format;"],
+  ])('rejects %s', async (_label, code) => {
+    expect(await boundaryErrors(code)).toContain(BOUNDARY_RULE);
+  });
+});