Verifying the functionality of the package.json types attribute in relation to the associated JavaScript file

One interesting feature in a package.json file is the ability to include a types property:

    ...
    "types": "index.d.ts"
    ...

However, it seems like there are no strict requirements on what this types file contains. It doesn't necessarily have to match the actual exports of the module or be valid.

The problem I encountered was due to not updating the types file after renaming an exported file. This led to import failures when using the module later.

What I'm looking for now is a way to automatically test whether the file referenced by the types property accurately represents the module's exports.

javascripttypescriptnpm

Answer №1

--declaration By using this TypeScript compiler option, you can automatically create a declaration file (d.ts) based on your TypeScript source file.

Within the build hooks in the scripts section of your package.json file, run the command 

tsc --out index.js --declaration src/index.ts
.

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