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The BearerTokenFetchClient takes a single parameter representing an access token and uses it to make the requests.

The disadvantage to this approach is not knowing to where the request will be sent, which in some cases is fine. An alternative is the LambdaFetchClient


import { graph } from "@pnp/graph";
import "@pnp/graph/users";
import { BearerTokenFetchClient } from "@pnp/core";
import { myTokenFactory } from "./my-auth.js";

    graph: {
        fetchClientFactory: () => {

            // note this method is not async, so your logic here cannot await.
            // Please see the LambdaFetchClient if you have a need for async support.
            const token = myTokenFactory();
            return new BearerTokenFetchClient(token);