PackFileCacheStrategy warnings with global Promise hook

Bug report

What is the current behavior?

I was runing a nextjs project with webpack5. When I added following code

class HookPromise extends Promise {}
global.Promise = HookPromise

I got some warnings like

<w> [webpack.cache.PackFileCacheStrategy] Restoring failed for Compilation/codeGeneration|external "@babel/runtime-corejs2/core-js/parse-int"|webpack-runtime from pack: Error: A lazy value that has been unmemorized can't be called again
<w> [webpack.cache.PackFileCacheStrategy] Restoring failed for Compilation/codeGeneration|external "next/dist/server/image-config.js"|webpack-runtime from pack: Error: A lazy value that has been unmemorized can't be called again
<w> [webpack.cache.PackFileCacheStrategy] Restoring failed for Compilation/codeGeneration|external "next/dist/shared/lib/to-base-64.js"|webpack-runtime from pack: Error: A lazy value that has been unmemorized can't be called again
<w> [webpack.cache.PackFileCacheStrategy] Restoring failed for Compilation/assets|chunkpages/blog from pack: Error: A lazy value that has been unmemorized can't be called again

If the current behavior is a bug, please provide the steps to reproduce.

see above

What is the expected behavior?

in lib/cache/PackFileCacheStrategy.js:

if (value instanceof Promise) {
  ...
}

I changed the conditional statement, the warnings were disappeared

if (value && typeof value.then === 'function') {
  ...
}

Other relevant information: nextjs version: 11.1.2 webpack version: nextjs bundled version Node.js version: 14.16.0 Operating System: mac os 11.4 Additional tools:

[alexander-akait]

Yes, PR welcome

[alexander-akait]

Example of fix inside the issue, we should change value instanceof Promise on value && typeof value.then === 'function'