sub-path imports on library code

[NullVoxPopuli]

rollup/plugins#1077

Example:

import { nodeResolve } from '@rollup/plugin-node-resolve';

export default {
	plugins: [
		nodeResolve({
			resolveOnly: module => module.startsWith('#'),
		}),
	],
};

we want to:

• resolve #
• not resolve anything else (with node-resolve)

[jrmlt]

For information, the following worked for me.

import { nodeResolve } from '@rollup/plugin-node-resolve';

export default {
	plugins: [
		nodeResolve(),
	],
};

But not

import { nodeResolve } from '@rollup/plugin-node-resolve';

export default {
	plugins: [
		nodeResolve({
			resolveOnly: module => module.startsWith('#'),
		}),
	],
};

I'm getting an error for all the files passed to

addon.publicEntrypoints()

[!] RollupError: Entry module "src/xxx/xxx.ts" cannot be external.
    at getRollupError (/xxx/node_modules/.pnpm/rollup@4.57.0/node_modules/rollup/dist/shared/parseAst.js:287:41)
    at Object.error (/xxx/node_modules/.pnpm/rollup@4.57.0/node_modules/rollup/dist/shared/parseAst.js:283:42)
    at ModuleLoader.loadEntryModule (/xxx/node_modules/.pnpm/rollup@4.57.0/node_modules/rollup/dist/shared/rollup.js:22940:32)
    at async Promise.all (index 0)

In the end I went with the alias plugin

const rootDirectory = dirname(fileURLToPath(import.meta.url));

export default {
  plugins: [
    alias({
      entries: [
        { find: '#src', replacement: `${rootDirectory}/src` },
      ],
    }),
  ],
};

[jrmlt]

Update.

Seems to work with

nodeResolve({ resolveOnly: [/^#/, /^src/] }),

[NullVoxPopuli]

Is there a plugin for reading all sub path imports from package.json? Maybe we need that 🤔

[jrmlt]

Didn't find anything except that @rollup/plugin-node-resolve is supposed to be the solution here.
Not sure about the impact of adding src to

nodeResolve({ resolveOnly: [/^#/, /^src/] })

Without src I guess we fall into this note

Note: Modules not matching any patterns will be marked as external.