When working with NextJs and MikroORM, encountering the error "Cannot use import statement outside a module

Resolving SyntaxError When Integrating MikroORM with NextJS

Challenge Encountered

While attempting to incorporate MikroORM v6.3.13 into a NextJS v14.2.14 project, I encountered a critical issue. At this point, my primary goal is to establish the setup correctly. To begin, I created a basic API where I aim to populate the SectionEntity:

export const dynamic = "force-dynamic";
export async function GET() {
    const orm = await MikroORM.init(config);
    const em = orm.em.fork();

    try {
        const section = new SectionEntity();
        section.locale = "en";
        section.page = "test";
        section.type = "form";
        section.key = "test_section";

        await em.persistAndFlush(section);

        console.log(section.createdAt);
        return NextResponse.json("SUCCESS", { status: 200 });
    } catch (error) {
        return NextResponse.json({ error: `${error}` }, { status: 500 });
    }
}

The specific error I'm facing is as follows:

import { Entity, PrimaryKey, Property, ManyToOne, type Rel } from "@mikro-orm/core";

SyntaxError: Cannot use import statement outside a module
    at internalCompileFunction (node:internal/vm:128:18)
    ...

Upon verification, my mikro-orm configuration appears functional when executing npx mikro-orm-esm debug:

Current MikroORM CLI configuration
    - dependencies:
      ...

Defining Entities

Here are the defined entities located in the folder ./server/entities:

import { Entity, PrimaryKey, Property, OneToMany, Collection } from "@mikro-orm/core";
...

Project TypeScript Configuration

In light of similar issues reported with MikroORM and NextJS, I explored potential solutions. Despite testing various remedies, none were effective or potentially broke other aspects of the project. Suggestions included adding

"type": "module"
, which also caused further complications.

This represents my current tsconfig:

{
    "compilerOptions": {
        ...  
    },
    "include": [...],
    "exclude": ["node_modules"]
}

In addressing this issue, I reviewed outdated solutions primarily focusing on NextJs implementations using pages router.

Resources Consulted:

Answer №1

Solution

After some experimentation and troubleshooting, I was able to find a solution for integrating MikroORM with the Next 14 app directory. Surprisingly, I ended up disregarding much of the information provided in the links related to the issue. Ultimately, it seemed to be a setup issue. Despite the documentation suggesting that you could import an entire folder containing entities, MikroORM actually requires each entity to be defined individually in the entities array.

Setting up NextJS app directory with MikroORM

If you're looking to kickstart a project using MikroORM and NextJS, I recommend using this template: MikroORM NextJS 14 Template

This isn't my repository, but following this approach is what worked for me to make it functional.

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