In v0.3.0, several APIs were changed but the existing APIs were kept but marked as deprecated.

Examples: Connection -> DataSource, findByIds.

In the v1.0 of TypeORM, we will remove these deprecated APIs.

This issue is currently a placeholder to track the overall task, but needs to have a list of the exact APIs to be removed, and should be referenced in any PRs removing these APIs.

• Remove the Connection class and related items #12020
• Remove the deprecated methods from QueryBuilder classes and from the Repository / EntityManager APIs. Remove deprecated lock modes. Remove AbstractRepository, WhereExpression etc. Skip findByIds. (S) #12078
• From Repository / EntityManager APIs remove findByIds (could be easily replaced with QueryBuilder.whereInIds?). (S) #12077
• Remove SapConnectionOptions / SapDriver deprecated properties. (XS) #12079
• Remove MySQL deprecations (width, zerofill etc) (XS-S) #12076
• Remove all container-related features and everything in globals.ts (XS) #12075
• Misc (XS-S):
  • ConnectionOptionsEnvReader
  • ConnectionManager - was planning to later extract this to some package and use the single-flight pattern to acquire connections, but we can use git history to get it. Can be removed now.
  • ...

MongoDB/BSON: Seems those deprecations are rather from the client, we just copy-pasted the types. Not sure if we need to do anything there.