$on is missing on the extended client

[aqrln]

Bug description

After applying a query extension to the client, it's not possible to add event listeners to it anymore.

How to reproduce

1. Create a client
2. Apply an extension
3. $on method is not present, neither in types nor at run time

Expected behavior

Client extensions shouldn't remove any methods from the client.

Prisma information

  const prisma = new PrismaClient({
    log: [{ emit: "event", level: "query" }],
  }).$extends({
    query: {
      $allOperations({ query, args }) {
        return query(args);
      },
    },
  });

  prisma.$on("query", (e) => console.log(e));

Environment & setup

• OS: macOS
• Database: SQLite
• Node.js version: v22.1.0

Prisma Version

prisma                  : 5.13.0
@prisma/client          : 5.13.0
Computed binaryTarget   : darwin-arm64
Operating System        : darwin
Architecture            : arm64
Node.js                 : v22.1.0
Query Engine (Node-API) : libquery-engine b9a39a7ee606c28e3455d0fd60e78c3ba82b1a2b (at ../../node_modules/.pnpm/@[email protected]/node_modules/@prisma/engines/libquery_engine-darwin-arm64.dylib.node)
Schema Engine           : schema-engine-cli b9a39a7ee606c28e3455d0fd60e78c3ba82b1a2b (at ../../node_modules/.pnpm/@[email protected]/node_modules/@prisma/engines/schema-engine-darwin-arm64)
Schema Wasm             : @prisma/prisma-schema-wasm 5.13.0-23.b9a39a7ee606c28e3455d0fd60e78c3ba82b1a2b
Default Engines Hash    : b9a39a7ee606c28e3455d0fd60e78c3ba82b1a2b
Studio                  : 0.500.0

[SevInf]

This is by design: https://www.prisma.io/docs/orm/prisma-client/client-extensions/query#if-you-use-the-query-extension-component-and-middlewares

Middlewares are supposed to be added before extensions.

[aqrln]

This issue is about events/logging, not middleware, though.

[SevInf]

Right, linked to the wrong page. $on is also missing by design: https://www.prisma.io/docs/orm/prisma-client/client-extensions#usage-of-on-and-use-with-extended-clients