TypeScript 3.9.4 is a patch release addressing issues found in the 3.9 series, primarily focusing on stability and bug fixes rather than introducing new features. Comparing it to the previous stable version, 3.9.3, developers will find that the core functionalities remain consistent, ensuring a smooth transition for existing projects.
A key difference lies in the updated development dependencies. While both versions share a large set of devDependencies like eslint, mocha, gulp, and various @types/* packages for testing and development workflows, TypeScript 3.9.4 explicitly depends on "typescript":"^3.9.3". This indicates that the 3.9.4 build process relies on functionalities present in the 3.9.3 version. In contrast, TypeScript 3.9.3 has "typescript":"next", meaning it was built using the next available version of TypeScript at the time indicating a potentially unstable snapshot.
For developers, upgrading to 3.9.4 ensures they are working with a more refined and tested version of the TypeScript compiler. While the core language features remain the same, the bug fixes and stability improvements in 3.9.4 translate to a smoother development experience, reducing potential surprises during compilation and runtime. The release dates also highlight the recency of the versions, with 3.9.4 being published more recently, suggesting it incorporates the latest fixes and refinements.
The are not vulnerabilities for the version 3.9.4 of the package typescript