Type error for servicePrincipalCredentialsBuilder()

I am utilizing the adobe PDF services SDK in Node.js (typescript) as follows:

        const credentials = PDFServicesSdk.Credentials
            .servicePrincipalCredentialsBuilder()
            .withClientId(process.env.PDF_SERVICES_CLIENT_ID)
            .withClientSecret(process.env.PDF_SERVICES_CLIENT_SECRET)
            .build();

However I keep getting the following type error even though it is working as it should

Property 'servicePrincipalCredentialsBuilder' does not exist on type 'typeof Credentials'.ts(2339)

I did install the types for the node sdk, but that didn't help

@types15111019/adobe__pdfservices-node-sdk"