plugins: Incompatibility with subpath imports

Rollup Version

2.62.0

Operating System (or Browser)

Chrome

Node Version (if applicable)

15.4.0

Link To Reproduction

Check here

Expected Behaviour

Rollup should support by default the subpath imports feature provided NodeJS.

Actual Behaviour

In advance, sorry but this bug requires the package.json and can’t be reproduced without it.

My library takes advantage of the NodeJS subpath imports. My package.json looks like this:

{
  "name": "mylib",
  "version": "0.0.1",
  ...
  "imports": {
    "#db/*": "./db/*.js"
  }
  ...
}

and in my code, I import internal files as follows:

import db from "#db/connect";

Unfortunately, when I try to bundle my code, I get an Unresolved dependencies error from Rollup. It can’t resolve the #db/connect path.

For reference, here is my rollup.config.js:

import resolve from "rollup-plugin-node-resolve";
import commonjs from "rollup-plugin-commonjs";
import babel from "rollup-plugin-babel";
import pkg from "./package.json";

export default [
    {
        input: "src/index.js", // entry point
        output: {
            name: "mylib", // package name
            file: pkg.browser,
            format: "umd",
        },
        plugins: [
            resolve(),
            commonjs(),
            babel({
                exclude: ["node_modules/**"],
            }),
        ],
    },
    {
        input: "src/index.js", // entry point
        output: [
            { file: pkg.main, format: "cjs" },
            { file: pkg.module, format: "es" },
        ],
        plugins: [
            babel({
                exclude: ["node_modules/**"],
            }),
        ],
    },
];

Rollup should support the subpath import feature provided NodeJS by default.