I’m trying to get two Cloud Run services in the same VPC to communicate with each other. I’m following this tutorial. The section I linked is the one I’m having problems with. The faulty code right now looks like this:

    import { GoogleAuth } from 'google-auth-library';
    const auth = new GoogleAuth();
    
    client: any;
    clientHeaders: any;
    
    serviceUrl = "https://url"
    headers = {
        'Content-type': 'application/json; charset=UTF-8',
    };
    
    async setup() {
        try {
            if (!this.client)
                this.client = await auth.getIdTokenClient(this.serviceUrl);
            const gcloudHeaders = await this.client.getRequestHeaders();
            this.headers = {
                ...gcloudHeaders,
                ...this.headers,
            };
            const res = await this.client.request({ url: this.serviceUrl });
            console.info(res.data);
        } catch (err) {
            throw Error(
                'could not create an identity token: ' + err.message
            );
        }
    }

This code throws the following error:

Uncaught (in promise) Error: could not create an identity token: o.emitWarning is not a function
at p.setup

Looking into it, it seems to be a nodeJS issue, possibly inside google-auth-library. Googling the issue doesn’t give me many results, and none speficic to google-auth-library. Versions:

nodeJS v20.10.0 
google-auth-library ^9.7.0

Any ideas?