TypeORM fails with ColumnTypeUndefinedError when using TSX despite emitDecoratorMetadata enabled

[wlcastro]

Acknowledgements

• I read the documentation and searched existing issues to avoid duplicates
• I understand this is a bug tracker and anything other than a proven bug will be closed
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Minimal reproduction URL

https://github.com/wlcastro/typeorm-tsx-decorator-metadata-issue

Problem & expected behavior

This issue has already been reported in #485 and #216, but both were closed and restricted to collaborators — so I’m opening a new issue to share a reproducible example and a workaround that resolves it.

What happened: When using TypeORM with TSX, I get a ColumnTypeUndefinedError for properties decorated with @Column() — even with emitDecoratorMetadata: true in tsconfig.json and reflect-metadata imported correctly.

What I expected: The code should run normally, as it does with ts-node or tsc.

Error stack trace:

ColumnTypeUndefinedError: Column type for User#name is not defined and cannot be guessed.

Explicitly declaring the column type (e.g. @Column("text")) is a workaround for the issue. I’m sharing this to help others and suggest documenting this limitation in TSX.

Bugs are expected to be fixed by those affected by it

• I'm interested in working on this issue

Compensating engineering work will speed up resolution and support the project

• I'm willing to offer $10 for financial support