graphql-codegen-esm does not work with pothos

[trixobird]

I am playing around with esm modules, so I am migrating an existing playground project to use esm. I managed to migrate all of the things, but the graphql-codegen. On the main branch, codegen works, but is using as a source a url. This is not production friendly, as we want to generate staff before the code is deployed.

I have created a branch named code-gen-esm and here is what I have got;

file: apps/graphql/package.json
  "scripts": {
    "codegen": "graphql-codegen-esm --config src/schema/codegen.ts"
  },

file apps/graphql/src/schema/codegen.ts

import type { CodegenConfig } from '@graphql-codegen/cli'
import { printSchema } from 'graphql';
import schema from './index.js';

const config: CodegenConfig = {
  schema: printSchema(schema),
  watch: true,
  emitLegacyCommonJSImports: false,
  generates: {
    './src/schema/generated/schema.graphql': {
      plugins: ['schema-ast'],
    },
  }
}
export default config

file apps/graphql/src/schema/index.ts

import {builder} from '../builder.js';
[...]
export default builder.toSchema();

Once I run the script I am getting Cannot find module './index.js', which seems wrong since in esm we should have suffixes on the imports. Anyway I am removing the suffix so 3rd line of the codegen.ts becomes import schema from './index';
Now I am getting the error: Cannot find module '../builder.js'

This functionality was working fine when I was on commonJS. Is there something that I am doing wrong, or should I stick to commonJS for the time being?