Javascript Playwright locator.evaluateAll 如何返回使用 node forEach 填充的 map

我想要获取所有<custom-tag>个 node 的属性以及类型<custom-text>或类型<custom-number>的子 node 的innerText

DevTools中的一个简化版本是

const headersMap = new Map();
var headers = Object.create(null);
document.querySelectorAll("h2").forEach(el => {
    
    headers[el.id] = el.innerText
    headersMap.set(el.id, el.innerText)    
});
console.log("h2 count > 2 === " , (headersMap.size>2))
console.table(Array.from(headersMap, ([name, value]) => ({ name, value })));

对于API testing page人，它看起来是这样的

这是我的剧作家try

test('API Testing - H2 count greater than 2', async ({ }) => {     
    await test.step('API Testing - get titles', async() => {

        await page.goto('https://playwright.dev/docs/api-testing');
        
        const headersList = await page.locator('h2');
        var headersMap = await headersList.evaluateAll(node => {
            const headersMap = new Map();
            var headers = Object.create(null);
            headers[node.id] = node.innerText
            headersMap.set(node.id, node.innerText)    
            return headersMap;
        });
        await expect(headersMap.size).toBeGreaterThan(2);
        page.pause();
        
    });
});

但它报告说:

   Error: expect(received).toBeGreaterThan(expected)
   Matcher error: received value must be a number or bigint
   Received has value: undefined
      47 |             return headersMap;
      48 |         });
    > 49 |         await expect(headersMap.size).toBeGreaterThan(2);
         |                                       ^
      50 |         page.pause();

问题

• 我如何创建一个对象，用forEach填充它并返回它？
• 必须进行哪些更改才能使my_locator.evaluateAll()返回 map ？