Since I upgraded Node to version 16, I started noticing this when I build my Angular app.

DeprecationWarning: Use of deprecated folder mapping "./" in the "exports" field module resolution of the package at "...\node_modules\postcss\package.json". Update this package.json to use a subpath pattern like "./*". 

Is there a way to fix this without downgrading the Node version?

8 Answers

Solution:

I was using node 16 switched back to 14 and it started working.

Regarding the GitHub issue, this one is recurrent one:

An update of postcss should do the job.

Go to your client directory in your project and npm i postcss.

Take a look at your package.json and check if you have --prod flag in the build script, if so update it for --configuration production

That will solve the issue, too

I suffered from the same issue but into tslib package
I tried updating version by version till this version 2.4.0 now everything works correctly

The best way to fix this is to downgrade to a lower version of Node. But not doing a reinstall of Node.

Install NVM - Node version manager. That way you can have multiple versions of Node at the same time. For each project, you will be able to switch to a specific Node version you want. It can be found at

Try with this:

Go to node_modules\postcss\package.json

swap out "./": "./" with "./*": "./"

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