Unable to use with rollup

[quentincaffeino]

By importing hydra (import {Hydra} from 'alcaeus';) I get this error

[!] Error: 'promises' is not exported by node_modules/jsonld/lib/index.js
https://rollupjs.org/guide/en/#error-name-is-not-exported-by-module
node_modules/alcaeus/lib/es/MediaTypeProcessors/RdfProcessor.js (2:9)
1: import JsonLdSerializer from '@rdfjs/serializer-jsonld';
2: import { promises as jsonld } from 'jsonld';
            ^
3: import $rdf from 'rdf-ext';
4: import stringToStream from 'string-to-stream';
Error: 'promises' is not exported by node_modules/jsonld/lib/index.js
    at error (/app/node_modules/rollup/dist/shared/node-entry.js:5400:30)
    at Module.error (/app/node_modules/rollup/dist/shared/node-entry.js:9820:16)
    at handleMissingExport (/app/node_modules/rollup/dist/shared/node-entry.js:9721:28)
    at Module.traceVariable (/app/node_modules/rollup/dist/shared/node-entry.js:10159:24)
    at ModuleScope.findVariable (/app/node_modules/rollup/dist/shared/node-entry.js:8766:39)
    at FunctionScope.findVariable (/app/node_modules/rollup/dist/shared/node-entry.js:3065:38)
    at ChildScope.findVariable (/app/node_modules/rollup/dist/shared/node-entry.js:3065:38)
    at MemberExpression.bind (/app/node_modules/rollup/dist/shared/node-entry.js:6530:49)
    at CallExpression$1.bind (/app/node_modules/rollup/dist/shared/node-entry.js:3152:23)
    at CallExpression$1.bind (/app/node_modules/rollup/dist/shared/node-entry.js:6718:15)

Replication steps:

1. Create new project yarn init
2. Add rollup yarn add rollup @rollup/plugin-node-resolve @rollup/plugin-commonjs
3. Create minimal rollup configuration file rollup.config.js with this content:

import resolve from '@rollup/plugin-node-resolve'
import commonjs from '@rollup/plugin-commonjs'

module.exports = {
  input: 'main.js',
  output: {
    file: 'bundle.js',
    format: 'es'
  },
  plugins: [ resolve({ browser: true }), commonjs() ]
};

4. Create file to compile main.js:

import { Hydra as client } from 'alcaeus';
client.loadResource('https://sources.test.wikibus.org/');

5. Compile with rollup main.js --config rollup.config.js

Other

Is this package event meant to be used in browser? No demos on website does not work either.
And it isn't specified anywhere what is the primary platform for this package.

[tpluscode]

Alcaeus itself is built to both commonjs and modules (note the /es/ segment in imported path).

However, many of its dependencies which are all targeted at node js only. That includes jsonld as well as all the RDF/JS packages and node streams.

That said, I have not really used it with rollup. I will have to investigate

[tpluscode]

Hello again @quentincaffeino
I'm nearing a 1.0 version (will beta soon) and I though I would give this a go.

I think I can fix the problem you experience by changing some of the commonjs imports. This is related to default exports, module.exports and how rollup resolves them. You can read more on rollup/plugins#71 and rollup wiki

Unfortunately there is also a bigger problem with readable-stream. See nodejs/readable-stream#348. This is the wall I've currently just hit and don't know how to fix...

For the time being, you would be stuck with webpack, which I have been using successfully for a long time.

[quentincaffeino]

Thanks for your time anyway!

[tpluscode]

There is little I can do from alcaeus perspective. Will close this now