`require.cache` is `undefined` in SEA

Version

v20.4.0 v20.5.1 v20.3.0

Platform

Linux 5.15.90.1-microsoft-standard-WSL2

Subsystem

No response

What steps will reproduce the bug?

echo 'console.log(typeof require.cache)' > main.js
node main.js
echo '{ "main": "main.js", "output": "sea-prep.blob" }' > sea-config.json
node --experimental-sea-config sea-config.json
cp $(command -v node) hello
npx postject hello NODE_SEA_BLOB sea-prep.blob --sentinel-fuse NODE_SEA_FUSE_fce680ab2cc467b6e072b8b5df1996b2
./hello

How often does it reproduce? Is there a required condition?

Always reproducible

What is the expected behavior? Why is that the expected behavior?

require.cache should be an object as of https://nodejs.org/api/modules.html#requirecache

What do you see instead?

require.cache is undefined. Trying to index it or enumerate it with Object.entries will result in TypeError

Additional information

This is relevant for Fastify which uses cache to provide a printable name for a plugin (based on its file path). See https://github.com/fastify/fastify/blob/c235d2dc136a67c51095f188742c743d8cb32839/lib/pluginUtils.js#L27

先在 main.js 中进行复现，并使用 sea-config.json 完成 SEA 设置，然后比较普通 Node 进程和生成的可执行文件中的 require.cache 行为。阅读 Node.js 模块文档和与 SEA 相关的运行时入口点；当在复现的 SEA 场景中 require.cache 是一个对象且不破坏 Fastify pluginUtils 用例时，即表示完成。