Google Domain Wide Delegation Client
npm install google-dwd
const { GoogleAuth } = require('google-auth-library');
const dwd = require('google-dwd');
const auth = new GoogleAuth();
const client = await auth.getClient();
const dwdClient = await dwd(<
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span class="pl-s1">client, 'test@googleworkspace.com', [ 'https://www.googleapis.com/auth/gmail.readonly' ]);