Does the inclusion of a d.ts file in a JavaScript npm package constitute a breaking change according to SemVer guidelines?

Is adding a d.ts type declaration file and a new "types" property in the package.json of a JavaScript npm package considered a breaking change? Would it require a major version bump according to SemVer?

This situation could go either way. It doesn't impact the JavaScript code and doesn't break any APIs. However, there is a chance of conflicts with custom d.ts types if someone is using the library in a TypeScript project, leading to errors like "Duplicate Identifier."

Answer №1

The principles of Semantic Versioning

Under the Semantic Versioning system, the version number is composed of three parts: MAJOR.MINOR.PATCH. Each part has a specific purpose:

  1. MAJOR version is incremented for incompatible API changes,
  2. MINOR version is increased for backwards compatible functionality additions, and
  3. PATCH version is updated for bug fixes that maintain backward compatibility.

When adding a type declaration file, it does not qualify as a bug fix (#3). The rationale behind this is that including a type declaration file does not break any code consuming the API, since the actual JavaScript code remains unchanged. Hence, there are no incompatible API changes associated with it, ensuring backward compatibility.

In conclusion, incorporating a type declaration file warrants an increase in the minor version number.

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