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typeorm-pro

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TypeORM guidance — decorators, repositories, migrations, query builder, and avoiding its classic pitfalls.

skills/typeorm-pro/SKILL.md

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## Overview

TypeORM is the long-standing TypeScript ORM in the ActiveRecord/DataMapper tradition: decorators declare entities, repositories and the query builder execute queries, and it supports nearly every database. Its flexibility is its risk — the same task can be done five ways, and several of them are slow or unsafe.

TypeORM rewards explicitness: repositories over magic, the query builder over clever decorators, migrations over `synchronize`. This skill covers the safe subset of TypeORM — entity design, repository patterns, migration discipline — and the classic pitfalls (N+1, `synchronize: true`, lazy relations) that have ended careers.

## When to use

- Working in an existing TypeORM codebase (very common in NestJS apps).
- Designing entities, relations, and indexes.
- Choosing between repository API, query builder, and raw SQL.
- Writing and running migrations safely.
- Fixing N+1 queries or slow TypeORM code.
- Deciding whether to adopt, keep, or migrate away from TypeORM.
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