Package path . is not exported from package

[martpie]

Hello 👋

While trying to solve martpie/next-transpile-modules#147, I realized the problem was most probably coming from enhanced-resolve.

Here's a snippet:

const enhancedResolve = require('enhanced-resolve');
const process = require('process');

const resolve = enhancedResolve.create.sync();

console.log(resolve(process.cwd(), 'nanoid'));

And the stack trace is:

/Users/pierre/dev/test-ntm-nanoid/node_modules/enhanced-resolve/lib/Resolver.js:246
		if (err) throw err;
		         ^

Error: Package path . is not exported from package /Users/pierre/dev/test-ntm-nanoid/node_modules/nanoid (see exports field in /Users/pierre/dev/test-ntm-nanoid/node_modules/nanoid/package.json)
    at /Users/pierre/dev/test-ntm-nanoid/node_modules/enhanced-resolve/lib/ExportsFieldPlugin.js:104:7
    at Hook.eval [as callAsync] (eval at create (/Users/pierre/dev/test-ntm-nanoid/node_modules/tapable/lib/HookCodeFactory.js:33:10), <anonymous>:22:1)
    at Hook.CALL_ASYNC_DELEGATE [as _callAsync] (/Users/pierre/dev/test-ntm-nanoid/node_modules/tapable/lib/Hook.js:18:14)
    at Resolver.doResolve (/Users/pierre/dev/test-ntm-nanoid/node_modules/enhanced-resolve/lib/Resolver.js:407:16)
    at /Users/pierre/dev/test-ntm-nanoid/node_modules/enhanced-resolve/lib/DescriptionFilePlugin.js:74:17
    at /Users/pierre/dev/test-ntm-nanoid/node_modules/enhanced-resolve/lib/DescriptionFileUtils.js:118:13
    at /Users/pierre/dev/test-ntm-nanoid/node_modules/enhanced-resolve/lib/forEachBail.js:16:12
    at onJson (/Users/pierre/dev/test-ntm-nanoid/node_modules/enhanced-resolve/lib/DescriptionFileUtils.js:108:6)
    at /Users/pierre/dev/test-ntm-nanoid/node_modules/enhanced-resolve/lib/DescriptionFileUtils.js:68:7
    at SyncAsyncFileSystemDecorator.readJson (/Users/pierre/dev/test-ntm-nanoid/node_modules/enhanced-resolve/lib/SyncAsyncFileSystemDecorator.js:89:25)

nanoid's exports field looks like this:

Any idea what could go wrong exactly? Am I misusing enhanced-resolve?

cheers!

[sokra]

There is no default condition in the exports field and you didn't specify any conditions in the resolver (conditionNames option)

[martpie]

Great, thank you! I will forward that to the maintainer of nanoid!

[sokra]

You need to pass the conditions that applies in your use case. E.g. import if this is a request from an import.

[martpie]

Thank you for the tip!

[ai]

@sokra what file we should use default export section?

[sokra]

Note that's not wrong to not have a default, we just recommend to have one as fallback for unforeseen and future cases.

Here is a note about that in our guide:
https://webpack.js.org/guides/package-exports/#common-patterns
Reading the whole guide is also interesting, but it's pretty long...

Anyway here you can change imports to default.

[ai]

I added default and browser.default to dual-publish and re-released Nano ID

ai/dual-publish@a85c242

[martpie]

Thank you very much @ai !