What is the best way to leverage the typesVersions field in package.json in order to deliver enhanced typings for upcoming TypeScript versions?

As mentioned in the TypeScript 3.1 release notes, typescript allows for stricter type shipping in npm packages through the typesVersions field in package.json with the following configuration:

{
  "name": "package-name",
  "version": "1.0",
  "types": "./index.d.ts",
  "typesVersions": {
    ">=3.1": { "*": ["ts3.1/*"] }
  }
}

However, it is not specified in the documentation how the designated ts3.1/index.d.ts file should be generated. Do I need to manually create an index.d.ts file at this location? Is there a method within typescript or a related build tool to generate stricter types conditionally?

typescriptnpmtypesbuild

Answer №1

Exploring the Future of TypeScript in 2023 and Beyond

exports takes precedence over typesVersions

In the latest update, TypeScript now prioritizes the exports field over the typesVersions field when resolving through a package.json under --moduleResolution node16. If you find that this adjustment affects your library, make sure to include version selectors with types@ in the exports section of your package.json. Here is how you can implement it: 

{
      "type": "module",
      "main": "./dist/main.js"
      "typesVersions": {
          "<4.8": { ".": ["4.8-types/main.d.ts"] },
          "*": { ".": ["modern-types/main.d.ts"] }
      },
      "exports": {
          ".": {
              "types@<4.8": "4.8-types/main.d.ts",  ✅
              "types": "modern-types/main.d.ts",    ✅
              "import": "./dist/main.js"
          }
      }
  }

Answer №2

Exciting Development

It appears that a member of the TS team has recently embarked on a project to create a tool for this specific task, possibly as a side endeavor. While the tool seems to still be a work in progress at the time of writing, it is definitely worth keeping an eye on. Check out the GitHub repository here!

Status Quo

From my research, it seems that no automated tool currently exists for generating these files. The most recent update from a TypeScript team member indicates that they do not plan to incorporate this feature into the compiler. A similar request was made here with no definitive response. As of now, manual translation may be your only option.

(In essence, the concept of a potential tool for this task could be likened to a "Babel for typings": handling new syntax/keywords and either "polyfilling" or removing new type helpers. It might even be feasible to develop as a Babel plugin.)

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