Missing types field in package.json

[demurgos]

The package.json files have a main field but are missing a types field, it prevents some editors (such as Jetbrains' Webstorm and Intellij) from picking the type declarations and providing autocompletion.

For example, for @actions/core, the package.json should look like this:

{
  "name": "@actions/core",
  "main": "lib/core.js",
  "types": "lib/core.d.ts"
  // ...
}

[demurgos]

I found that the error was on my end, I was using the Typescript options allowSyntheticDefaultImports and esModuleInterop with default imports (instead of star imports) while the modules are marked as transpiled from Typescript. After switching to star imports, it works. It may still be a good thing to add the types field but it's less important.

[bryanmacfarlane]

In addition actions should have dev dependency on types:
https://github.com/actions/javascript-action/blob/master/package.json#L26

But yeah, looks like a good thing to set per docs:
https://www.typescriptlang.org/docs/handbook/declaration-files/publishing.html