According to the documentation provided on this link, TypeORM is designed to prevent duplicate execution of successful migration files.
Given this information, it is unclear whether the use of IF NOT EXISTS is necessary when creating a new table, column, etc...
Should we include IF NOT EXISTS in our auto-generated migration scripts?
With TypeORM, you can rely on its built-in functionality to manage migrations effectively. The system automatically tracks which migrations have been applied, eliminating the need for manual oversight.
This automated process ensures that migrations are only executed once, preventing any duplication errors. Therefore, there's no need to include "IF NOT EXISTS" clauses when creating tables or columns.
Although TypeORM does keep track of migrations, our team has experienced numerous production issues related to conflicting migrations. Resolving these issues can be a messy task, especially in a live environment. The larger the team, the more likely it is that these problems will arise.
I urge everyone to ensure that their migrations are modified to check for existence. This simple step requires minimal manual effort and has absolutely no downsides. However, it could prevent headaches in the future.
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