Lol ok I would but apparently I have to sign up to Debian Salsa and you can't sign up with a gmail account. I don't think they really want contributions! Anyway here is the code. I made some minor improvements that won't affect the runtime. You need to `npm install @types/node`.

    // The Computer Language Benchmarks Game
    // https://salsa.debian.org/benchmarksgame-team/benchmarksgame/
    //
    // contributed by Ian Osgood
    // Optimized by Roy Williams
    // modified for Node.js by Isaac Gouy
    // multi thread by Andrey Filatkin

    import { Worker as NodeWorker, isMainThread, parentPort, workerData } from 'worker_threads';
    import * as os from 'os';

    enum MessageVariant {
        Sab,
        Au,
        Atu,
        Exit,
    }

    interface SabMessage {
        variant: MessageVariant.Sab;
        data: Float64Array;
    }

    interface AuMessage {
        variant: MessageVariant.Au;
        vec1: UVWField,
        vec2: UVWField,
    }

    interface AtuMessage {
        variant: MessageVariant.Atu;
        vec1: UVWField,
        vec2: UVWField,
    }

    interface ExitMessage {
        variant: MessageVariant.Exit;
    }

    type Message = SabMessage | AuMessage | AtuMessage | ExitMessage;

    interface UVW {
        u: Float64Array;
        v: Float64Array;
        w: Float64Array;
    }

    type UVWField = keyof UVW;

    const bytesPerFloat = Float64Array.BYTES_PER_ELEMENT;

    if (isMainThread) {
        mainThread(+process.argv[2]);
    } else {
        workerThread(workerData);
    }

    async function mainThread(n: number) {
        const sab = new SharedArrayBuffer(3 * bytesPerFloat * n);
        const u = new Float64Array(sab, 0, n).fill(1);
        const v = new Float64Array(sab, bytesPerFloat * n, n);

        const workers = new Set<NodeWorker>();
        startWorkers();

        for (let i = 0; i < 10; i++) {
            await atAu('u', 'v', 'w');
            await atAu('v', 'u', 'w');
        }

        stopWorkers();

        let vBv = 0;
        let vv = 0;
        for (let i = 0; i < n; i++) {
            vBv += u[i] * v[i];
            vv += v[i] * v[i];
        }

        const result = Math.sqrt(vBv / vv);

        console.log(result.toFixed(9));

        async function atAu(u: UVWField, v: UVWField, w: UVWField) {
            await work({ variant: MessageVariant.Au, vec1: u, vec2: w });
            await work({ variant: MessageVariant.Atu, vec1: w, vec2: v });
        }

        function startWorkers() {
            const cpus = os.cpus().length;
            const chunk = Math.ceil(n / cpus);

            for (let i = 0; i < cpus; i++) {
                const start = i * chunk;
                let end = start + chunk;
                if (end > n) {
                    end = n;
                }
                const worker = new NodeWorker(__filename, {workerData: {n, start, end}});

                worker.postMessage({ variant: MessageVariant.Sab, data: sab });
                workers.add(worker);
            }
        }

        function work(message: Message) {
            return new Promise(resolve => {
                let wait = 0;
                workers.forEach(worker => {
                    worker.postMessage(message);
                    worker.once('message', () => {
                        wait--;
                        if (wait === 0) {
                            resolve();
                        }
                    });
                    wait++;
                });
            });
        }

        function stopWorkers() {
            workers.forEach(worker => worker.postMessage({ variant: MessageVariant.Exit }));
        }
    }

    function workerThread({n, start, end}: {n: number, start: number, end: number}) {
        let data: UVW | undefined = undefined;

        if (parentPort === null) {
            return;
        }

        parentPort.on('message', (message: Message) => {
            switch (message.variant) {
                case MessageVariant.Sab:
                    data = {
                        u: new Float64Array(message.data, 0, n),
                        v: new Float64Array(message.data, bytesPerFloat * n, n),
                        w: new Float64Array(message.data, 2 * bytesPerFloat * n, n),
                    };
                    break;
                case MessageVariant.Au:
                    if (data === undefined) {
                        throw Error('Au received before Sab');
                    }
                    au(data[message.vec1], data[message.vec2]);
                    parentPort!.postMessage({});
                    break;
                case MessageVariant.Atu:
                    if (data === undefined) {
                        throw Error('Atu received before Sab');
                    }
                    atu(data[message.vec1], data[message.vec2]);
                    parentPort!.postMessage({});
                    break;
                case MessageVariant.Exit:
                    process.exit();
            }
        });

        function au(u: Float64Array, v: Float64Array) {
            for (let i = start; i < end; i++) {
                let t = 0;
                for (let j = 0; j < n; j++) {
                    t += u[j] / a(i, j);
                }
                v[i] = t;
            }
        }

        function atu(u: Float64Array, v: Float64Array) {
            for (let i = start; i < end; i++) {
                let t = 0;
                for (let j = 0; j < n; j++) {
                    t += u[j] / a(j, i);
                }
                v[i] = t;
            }
        }

        function a(i: number, j: number) {
            return ((i + j) * (i + j + 1) >>> 1) + i + 1;
        }
    }