False Missing Export on export * from

[shellscape]

• Rollup Version: 2.36.2
• Operating System (or Browser): Mac OS
• Node Version (if applicable): 4.15.3
• Link to reproduction (IMPORTANT, read below):

Expected Behavior

I'm attempting to bundle @graphql-mesh/utils which performs this import: https://github.com/Urigo/graphql-mesh/blob/4303d22a27690b0d0df6d4804aac2d233c6856a1/packages/utils/src/read-file-or-url.ts#L1

From the the fetchache package: https://github.com/ardatan/fetchache/blob/09f0d39fe8a3e5f7d76e60dfe8aed08b77badfd8/src/index.ts#L63

The index.esm.js file checks out, as it does an export * from 'cross-fetch'. That should work well.

Actual Behavior

With both commonjs and node-resolve plugins, we get:

src/main → stdout...
[!] Error: 'Request' is not exported by node_modules/fetchache/index.esm.js, imported by src/main.js
https://rollupjs.org/guide/en/#error-name-is-not-exported-by-module
src/main.js (1:9)
1: import { Request } from 'fetchache';
            ^
2: 
3: console.log(Request)
Error: 'Request' is not exported by node_modules/fetchache/index.esm.js, imported by src/main.js
    at error (/home/runner/rollup-repro/node_modules/rollup/dist/shared/rollup.js:5265:30)
...

Which is not true, as Request is actually exported via export * from 'cross-fetch'. I downloaded the package tarball to confirm, and the same can be seen by inspecting the file in node_modules.

Commenting out commonjs yields:

src/main → stdout...
[!] Error: 'fetch' is not exported by node_modules/cross-fetch/dist/node-ponyfill.js, imported by node_modules/fetchache/index.esm.js
https://rollupjs.org/guide/en/#error-name-is-not-exported-by-module
node_modules/fetchache/index.esm.js (2:9)
1: import CachePolicy from 'http-cache-semantics';
2: import { fetch, Response, Request } from 'cross-fetch';
            ^
3: export * from 'cross-fetch';
Error: 'fetch' is not exported by node_modules/cross-fetch/dist/node-ponyfill.js, imported by node_modules/fetchache/index.esm.js
    at error (/home/runner/rollup-repro/node_modules/rollup/dist/shared/rollup.js:5265:30)

Which is even weirder. There's definitely something funky going on with either module resolution, or Rollup not picking up on exports that are there.

[lukastaegert]

Looks like this issue: #3894 (note that cross-fetch is commonjs)

[lukastaegert]

It is not merged because there was no agreement yet how to handle multiple namespace reexports from files with synthetic named exports (i.e. commonjs files).

[shellscape]

@lukastaegert Sure does. I didn't connect the dots there. Is there a "better than nothing" path that we can take (maybe with warnings) that's better than no path at all? Without a path forward, I'm not sure how to get this bundle working aside from requesting changes from the package author.