mercuriusCodegen is not a function

[turkerdev]

without that function it runs, but it doesnt generate generated.ts and i cant get intellisense in resolver.
also i ran your example, it works fine.
i use module as type in package.json, i dont know if that matters because you use cjs in your example

import fastify from "fastify";
import logger from "../utils/logger.js";
import mercurius from "mercurius";
import resolvers from "../graphql/resolvers/main.js";
import env from "../config/env.js";
import mercuriusCodegen, { loadSchemaFiles } from "mercurius-codegen";
import { buildSchema } from "graphql";
const server = fastify();
const { schema } = loadSchemaFiles("src/graphql/*.gql", {
    watchOptions: {
        enabled: env.NODE_ENV === "development",
        onChange(schema) {
            server.graphql.replaceSchema(buildSchema(schema.join("\n")));
            server.graphql.defineResolvers(resolvers);
            mercuriusCodegen(server, {
                targetPath: "./src/generated/graphql.ts",
            });
        },
    },
});
server.register(mercurius, {
    graphiql: env.NODE_ENV === "development",
    schema,
    resolvers,
});
// HERE!
mercuriusCodegen(server, {
    targetPath: "./src/generated/graphql.ts",
    watchOptions: {
        enabled: env.NODE_ENV === "development",
    },
});
export default server;

[turkerdev]

solved the problem by using

codegen.codegenMercurius()

but it was odd why it didnt work other way.

[Pablo Sáez]

it's because of esModuleInterop, the main function is exported as .default and .codegenMercurius

anyways, I updated the examples to use the named export codegenMercurius