How to use the @pulumi/azure.config function in @pulumi/azure

private async getCDNManagementClient(): Promise {
        let clientID = azure.config.clientId;
        let clientSecret = azure.config.clientSecret;
        let tenantID = azure.config.tenantId;
        let subscriptionID = azure.config.subscriptionId;
        let credentials: ServiceClientCredentials;

        // If at least one of them is empty, try looking at the env vars.
        if (!clientID || !clientSecret || !tenantID || !subscriptionID) {
            await pulumi.log.info("Checking env vars for ARM credentials.", undefined, undefined, true);
            clientID = process.env["ARM_CLIENT_ID"];
            clientSecret = process.env["ARM_CLIENT_SECRET"];
            tenantID = process.env["ARM_TENANT_ID"];
            subscriptionID = process.env["ARM_SUBSCRIPTION_ID"];
        }

        // If they are still empty, try to get the creds from Az CLI.
        if (!clientID || !clientSecret || !tenantID || !subscriptionID) {
            await pulumi.log.info("Env vars did not contain ARM credentials. Trying Az CLI.", undefined, undefined, true);

private async getCDNManagementClient(): Promise {
        let clientID = azure.config.clientId;
        let clientSecret = azure.config.clientSecret;
        let tenantID = azure.config.tenantId;
        let subscriptionID = azure.config.subscriptionId;
        let credentials: ServiceClientCredentials;

        // If at least one of them is empty, try looking at the env vars.
        if (!clientID || !clientSecret || !tenantID || !subscriptionID) {
            await pulumi.log.info("Checking env vars for ARM credentials.", undefined, undefined, true);
            clientID = process.env["ARM_CLIENT_ID"];
            clientSecret = process.env["ARM_CLIENT_SECRET"];
            tenantID = process.env["ARM_TENANT_ID"];
            subscriptionID = process.env["ARM_SUBSCRIPTION_ID"];
        }

        // If they are still empty, try to get the creds from Az CLI.
        if (!clientID || !clientSecret || !tenantID || !subscriptionID) {