ERROR: No "GlobalWorkerOptions.workerSrc" specified. (Repeated 4 times)

[AutistiCoder]

I'm new to pdf.js and am using it in a React/TypeScript project with the pdfjs-dist package.

I have this code:

import {getDocument} from "pdfjs-dist";

async function parseFile(file: File): Promise<string>
{
        const pdf = await getDocument(await file.arrayBuffer()).promise;
        const text: string[] = [];
        for (let i = 0; i < pdf.numPages; i++)
        {
            const page = await pdf.getPage(i);
            const content = await page.getTextContent();
            try {
                text.push(content.items.map((item) => (item as TextItem).str).join(""));
            } catch (e) {
                console.error(e);
            };
        }
        return text.join("\n");
}

that results in this error, which is repeated multiple times:

ERROR
No "GlobalWorkerOptions.workerSrc" specified.
    at get workerSrc (http://localhost:3000/static/js/bundle.js:39875:11)
    at PDFWorker._initialize (http://localhost:3000/static/js/bundle.js:39766:7)
    at new PDFWorker (http://localhost:3000/static/js/bundle.js:39737:10)
    at getDocument (http://localhost:3000/static/js/bundle.js:38873:69)
    at parseFile (http://localhost:3000/static/js/bundle.js:130:76)
    at async Promise.all (index 0)

What's wrong? What do I need to do?

Thanks.