TypeError: WebAssembly.Instance(): Argument 0 must be a WebAssembly.Module

Support Edge Functions
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1

Hi Netlify,

Application is building fine, and deployment is successful, however app is down because of Edge function crash. Error message in logs is not much informative:

TypeError: WebAssembly.Instance(): Argument 0 must be a WebAssembly.Module
    at file:///root/.netlify/edge-functions/___netlify-edge-handler-src-middleware/server/src/middleware.js:454:880
    at async Object.loadLibrary (file:///root/.netlify/edge-functions/___netlify-edge-handler-src-middleware/server/src/middleware.js:454:1120)
    at async rJ.loadEngine (file:///root/.netlify/edge-functions/___netlify-edge-handler-src-middleware/server/src/middleware.js:454:2928)
    at async rJ.instantiateLibrary (file:///root/.netlify/edge-functions/___netlify-edge-handler-src-middleware/server/src/middleware.js:454:2524)

I guess it’s related to Prisma usage on edge. From This edge function has crashed as I understand Netlify doesn’t support Prisma edge.

Tech stack where we have problem is: NextJS 14 (app router), AuthJS, Prisma, Neon

Prisma schema (important part):


datasource db {
  provider  = "postgresql"
  url  	    = env("DATABASE_URL")
  directUrl = env("DIRECT_URL")
}

generator client {
  provider = "prisma-client-js"
  previewFeatures = ["driverAdapters"]
  engineType = "library"
}

Prisma instance creation:

import { Pool } from "@neondatabase/serverless";
import { PrismaNeon } from "@prisma/adapter-neon";
import { PrismaClient } from "@prisma/client";

const connectionString = process.env.DATABASE_URL;
const pool = new Pool({ connectionString });
const adapter = new PrismaNeon(pool);
let prisma: PrismaClient;

export type Transaction = Omit<
  PrismaClient,
  "$connect" | "$disconnect" | "$on" | "$transaction" | "$use"
>;

if (typeof globalThis.prisma === "undefined") {
  prisma = new PrismaClient({ adapter });
  if (process.env.NODE_ENV === "development") {
    globalThis.prisma = prisma; // For reuse in development to avoid multiple instances
  }
} else {
  prisma = globalThis.prisma;
}

export { prisma as db };

Auth config:

import type { JWT } from "@auth/core/jwt";
import { PrismaAdapter } from "@auth/prisma-adapter";
import type { UserRole } from "@prisma/client";
import NextAuth from "next-auth";
import { cookies } from "next/headers";

import authConfig from "@/auth.config";
import { getUserById } from "@/data/user";
import { db } from "@/lib/db";

export const {
  handlers: { GET, POST },
  auth,
  signIn,
  signOut,
  unstable_update: update,
} = NextAuth({
  secret: process.env.AUTH_SECRET,
  pages: {
    signOut: "/auth/sign-out",
    signIn: "/auth/sign-in",
    error: "/auth/error",
  },
  events: {
    async linkAccount({ user }) {...},
  },
  callbacks: {
    async signIn({ user, account }) {...},
    async session({ session, ...sessionToken }) {...},
    async jwt({ token, user }) {...},
  },
  adapter: PrismaAdapter(db),
  session: { strategy: "jwt" },
  ...authConfig,
});

Questions:

  1. Is there paln for Netlify to support Prisma on edge?
  2. Is it possible to get more clear information on edge function log to understand that it’s because of Prisma? Logs are not descriptive enough
  3. Is there any workaround to make it work on edge?
2

Here’s some discussion around making Prisma work with Deno: Add support for Deno · Issue #2452 · prisma/prisma