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Item 66: Understand the Three Versions Involved in Type Declarations

Things to Remember

  • There are three versions involved in an @types dependency: the library version, the @types version, and the TypeScript version.
  • Recognize the symptoms of different types of version mismatch.
  • If you update a library, make sure you update the corresponding @types.
  • Understand the pros and cons of bundling types versus publishing them on DefinitelyTyped. Prefer bundling types if your library is written in TypeScript, and DefinitelyTyped if it is not.