"imports" field support

[guybedford]

Feature request

In addition to the "exports" field, Node.js also defines the "imports" field to permit private internal resolutions to simplify backtracking and local conditional resolution cases. As far as I can tell this field isn't yet supported in Webpack.

What is the expected behavior?

When writing a package.json with an "imports" field, the #private specifier resolutions should resolve through these rules analogously to the exports field.

What is motivation or use case for adding/changing the behavior?

Node.js resolver support parity.

How should this be implemented in your opinion?

It's a similar extension to the exports field and exports package "own name" resolution.

Are you willing to work on this yourself?

Possibly!

[alexander-akait]

We already support them

[alexander-akait]

https://github.com/webpack/enhanced-resolve/blob/master/lib/ImportsFieldPlugin.js

[guybedford]

I've posted a failing test here in #12929.

[zdm]

How to make it works?
I got error

Module not found: Error: Can't resolve '#internal'