Separate the standard PackageJson types into it's own type

[barak007]

It will be nice to separate the standard part from the PackageJson type into it's own type let's say PackageJson.PackageJsonStandard.
This will allow to use keyof PackageJson.PackageJsonStandard and get the actual keys.
Right now since there is & {[key: string]: unknown;} at the end of the type the keyof operator is not very useful it returns string | number.

My use-case is that I want to write a function to copy standard values from one package.json to anther and I want it to be typesafe.

Example:

function copyCommonPackageValues(
  target: PackageJson,
  origin: PackageJson,
  // This is not safe right now I need something like keyof PackageJson.PackageJsonStandard
  keys: Array<keyof PackageJson>
) {
  for (const key of keys) {
    const value = origin[key];
    if (value) {
      target[key] = value;
    }
  }
}

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[sindresorhus]

I'm actually not sure why we have & {[key: string]: unknown;} there. Unless you see a good reason it's there, maybe we could just remove it? People that need it, could easily add that themselves.

[papb]

I agree, I wouldn't mind seeing this & {[key: string]: unknown;} removed as well.

[barak007]

Removing it will probably will be a major change for some people. If you have no problem with that I'm in. if not I can open a PR with the proposed change.

[sindresorhus]

Yes, PR welcome.