Report package.json line number in output

[jdeniau]

Feature request description

Actually, the reported output is something like

Unused devDependencies
* prettier

In the JSON output, we have

{
  "devDependencies": [
    "prettier"
  ]
}

It would be nice to have more detail on how to find "where" is defined this configuration:

For example, the vscode console allow us to click on lines "that looks like a filename with a line number" (ie. package.json:15)

Furthermore, some tools like reviewdog does parse the output to report checks on github, but actually it's really complicated to target a file.
Making reviewdog work with depcheck would be really usefull as they are complementary when working with a CI.

A possible nice output would be

Unused devDependencies
* prettier (package.json:15)

I think that it's not as easy as said regarding the JSON output, if that's the data structure that you use internally, as we have an array of string here.

The options I see here:

• Do not touch the JSON output, just "improve" the standard output
• Add the package line in the array of string ("devDependencies": ["prettier (package.json:15)"]), not pretty, but non-breaking
• change the data format : "devDependencies": [ { package: "prettier", "dependencyFile": "package.json", "dependencyLine": 15 } ]

I do not know if the json output is for debbuging purpose or if it is part of public API.

Any extra info

I can give a hand on this if you are OK with this feature.

[rumpl]

This would indeed be a great feature!

[jdeniau]

Thanks @rumpl .
What would be your prefered implementation ?