Troubleshooting connectivity issues between Entities in microORM and Next.js

While trying to run my Next.js application in typescript, I encountered the following error:

Error - ReferenceError: Cannot access 'Member' before initialization

After consulting the documentation at https://mikro-orm.io/docs/relationships#relations-in-esm-project, it seems that the suggested solution does not resolve the issue. When attempting to import Rel like this:

import { Rel } from '@mikro-orm/core';

and applying it around the entity Member, a new error occurs:

A type referenced in a decorated signature must be imported with 'import type' or a namespace import when 'isolatedModules' and 'emitDecoratorMetadata' are enabled.

Even after setting these options to false, the problem persists and more errors surface.

The problematic entity contains the following code:

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

@Entity()
export class File{
    
    @PrimaryKey({name: "fileId"})
    id!: number;

    @Property()
    name!: string;

    @Property()
    type!: string;

    @Property({ type: "longblob"})
    data!: Buffer;

    @Property()
    size!: number;

    @Property({name: "createdAt", type: "datetime", defaultRaw: "CURRENT_TIMESTAMP"})
    createdAt!: Date;

    @ManyToOne({entity: () => Member})
    member!: Rel<Member>;

    @Property({name: "inschrijvingsdocument"})
    isSignupDoc!: boolean;

    @Property({name: "opleidingsdocument"})
    isOpleidingsDoc!: boolean;
}
    

If anyone has a solution to this issue, your help would be greatly appreciated.

Answer №1

If you want to resolve this problem, try the steps listed below:

import type { Rel } from '@mikro-orm/core';

The error message was somewhat unclear in its description.

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