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7/15/2026
Strong TypeScript contracts turn refactors into checklists

Strong TypeScript contracts turn refactors into checklists

Short summary

A developer shares a refactoring lesson: changing an AsyncResult<T> type to a typed Result<T, E> with a RepositoryError produced 15 compiler errors that were actually downstream symptoms of a few outdated type definitions. Fixing the source contracts resolved all errors and tests passed. The takeaway is that strong types make architectural changes searchable, explicit, and finite rather than just preventing mistakes during initial coding.

  • •Refactoring type contracts from AsyncResult<T> to Result<T, E> surfaced 15 compiler errors
  • •Most errors were downstream symptoms of a few outdated type definitions, not separate bugs
  • •Strong types make architectural changes searchable, explicit, and finite

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