[Question] How to use the DataFactory provided by N3

[MMesch]

Is it possible to use the DataFactory object from the N3 library?

When I naively try new SHACLValidator(shapes, { factory: DataFactory }); I get:

Type 'typeof DataFactory' is not assignable to type 'Factory<Quad, Quad, DatasetCore<Quad, Quad>>'.
  Property 'dataset' is missing in type 'typeof DataFactory' but required in type 'DatasetCoreFactory<Quad, Quad, DatasetCore<Quad, Quad>>'. (tsserver 2322)

It did work well for me with rdf-ext but I wanted to avoid converting quad objects back and forth and also the extra dependency if possible.

I am not super experienced with Typescript. Any idea how to fix or work around this?

[MMesch]

Fixed using this new factory instead:

export const ExtendedDataFactory = {
	...DataFactory,
	dataset: quadsToN3Store
}

export function quadsToN3Store(quads: Quad[]): Store {
	return new Store(quads);
}

N3 also has a DataSetCoreFactory since recently (see rdfjs/N3.js#314 and https://github.com/rdfjs/N3.js/pull/398/files) but I struggled to use it since it's implemented as a class static function and I (beginner in Typescript, sorry) don't know how to efficiently combine that class with the DatasetFactory required by the SHACLValidator constructor.

[tpluscode]

Hello @MMesch. I'm glad you found a workaround.

Turns out that N3 types published from Definitely Types do not yet export the store. (PR DefinitelyTyped/DefinitelyTyped#70364)

In the future, I would like to be able to use N3 factories with RDF/JS Environment like,

import SHACLValidator from 'rdf-validate-shacl'
import { DataFactory, StoreFactory } from 'n3'
import Environment from '@rdfjs/environment'

const factory = new Environment([DataFactory, StoreFactory])

const validator = new SHACLValidator(shapes, { factory })

That, however, will require some changes in n3