vercel-sapper: Error: The Serverless Function "index" is 60mb which exceeds the maximum size limit of 50mb

I’ve been getting this issue below when deploying to vercel.

Error: The Serverless Function “index” is 60mb which exceeds the maximum size limit of 50mb. Learn more: https://vercel.com/docs/v2/platform/limits#serverless-function-size

Seems my static folder is more than 50mb. What’s strange though is I have NextJS applications with at least 1GB of data. Is this meant to happen? Is is a shortcoming of vercel-sapper in that it’s actually a serverless function run on vercel? What do?

vercel.json { "version": 2, "builds": [{ "src": "package.json", "use": "vercel-sapper" }] }