Migrations CLI fail with error: TypeError: dataSourceFileExports is not iterable

Issue Description

Steps to Reproduce

I am following the documentation and installing typeORM with the command: npx typeorm init --name MyProject --database postgres

running migrations with this command: yarn typeorm migration:show -d ./src/data-source.ts

will fail with the error: TypeError: dataSourceFileExports is not iterable at Function.loadDataSource (/Users/GitHub/MyProject/src/commands/CommandUtils.ts:37:34) at async Object.handler (/Users/GitHub/MyProject/src/commands/MigrationShowCommand.ts:27:26)

data-source.ts looks like this:

import "reflect-metadata"
import { DataSource } from "typeorm"
import { User } from "./entity/User"

export const AppDataSource = new DataSource({
    type: "postgres",
    host: "localhost",
    port: 5432,
    username: "test",
    password: "test",
    database: "test",
    synchronize: true,
    logging: false,
    entities: [User],
    migrations: [],
    subscribers: [],
})

My Environment

Dependency	Version
Operating System	MacOS
Node.js version	v18.8.0
Typescript version	4.5.2
TypeORM version	0.3.8

Are you willing to resolve this issue by submitting a Pull Request?

• ✖️ Yes, I have the time, and I know how to start.
• ✅ Yes, I have the time, but I don’t know how to start. I would need guidance.
• ✖️ No, I don’t have the time, but I can support (using donations) development.
• ✖️ No, I don’t have the time and I’m okay to wait for the community / maintainers to resolve this issue.

[backnight]

Downgrade to 0.3.4 solved the issue on my side (temporary solution).

Also, don’t forget to force the version “0.3.4” in package.json and not set it like “^0.3.4” because in that case, it will be the buggy 0.3.8 version that will be installed 😉

[boclair-temgoua]

Downgrade to 0.3.7 solved the issue on my side (temporary solution).

Also, don’t forget to force the version “0.3.7” in package.json and not set it like “^0.3.7” because in that case, it will be the buggy 0.3.8 version that will be installed 😉