Use N3.js in TypeScript

play-n3.ts

// https://github.com/rdfjs/N3.js/

import {Parser, StreamParser, Writer} from "n3";
import * as fs from "fs";
import {DataFactory} from 'n3';
import {Writable} from 'stream';

function fromQualsToAString() {
    const writer = new Writer({prefixes: {c: 'http://example.org/cartoons#'}});
    const {namedNode, literal, defaultGraph, quad} = DataFactory;
    writer.addQuad(
        namedNode('http://example.org/cartoons#Tom'),
        namedNode('http://www.w3.org/1999/02/22-rdf-syntax-ns#type'),
        namedNode('http://example.org/cartoons#Cat')
    );
    writer.addQuad(quad(
        namedNode('http://example.org/cartoons#Tom'),
        namedNode('http://example.org/cartoons#name'),
        literal('Tom')
    ));
    writer.end((error, result) => console.log(result));
}


function parsingFromStream() {
    const parser = new Parser();
    const rdfStream = fs.createReadStream('../cartoons.ttl');
    // @ts-ignore
    parser.parse(rdfStream, console.log);

    // const streamParser = new StreamParser();
    // const rdfStream = fs.createReadStream('cartoons.ttl');
    // rdfStream.pipe(streamParser);
    // streamParser.pipe(new SlowConsumer());
    //
    // function SlowConsumer() {
    //     const writer = new Writable({ objectMode: true });
    //     writer._write = (quad, encoding, done) => {
    //         console.log(quad);
    //         setTimeout(done, 1000);
    //     };
    //     return writer;
    // }
}


function parsingFromDocument() {
    const parser = new Parser();
    parser.parse(
        `PREFIX c: <http://example.org/cartoons#>
   c:Tom a c:Cat.
   c:Jerry a c:Mouse;
           c:smarterThan c:Tom.`,
        (error, quad, prefixes) => {
            if (quad)
                console.log(quad);
            else
                console.log("# That's all, folks!", prefixes);
        });
}


function creating() {
    const {namedNode, literal, defaultGraph, quad} = DataFactory;
    const myQuad = quad(
        namedNode('https://ruben.verborgh.org/profile/#me'),
        namedNode('http://xmlns.com/foaf/0.1/givenName'),
        literal('Ruben', 'en'),
        defaultGraph(),
    );
    console.log(myQuad.termType);              // Quad
    console.log(myQuad.value);                 // ''
    console.log(myQuad.subject.value);         // https://ruben.verborgh.org/profile/#me
    console.log(myQuad.predicate.value);
    console.log(myQuad.object.value);          // Ruben
// @ts-ignore
    console.log(myQuad.object.datatype.value); // http://www.w3.org/1999/02/22-rdf-syntax-ns#langString
// @ts-ignore
    console.log(myQuad.object.language);       // en
}

fromQualsToAString()
// parsingFromStream()
// parsingFromDocument()
// creating()