lint `main` and `bin` file paths

[pdehaan]

I've seen this in a few of our project's lately, so it'd be nice if the finepack tool could check if the file specified in main and bin paths are valid (something like fs.existsSync() or whatever).

For example, I think by default npm sets the main script to "index.js". In my case, the index file is set to "indexxxx.js" which doesn't exist. It'd be nice if finepack could display a warning or error.

{
  "name": "espree-test",
  "description": "",
  "version": "1.0.0",
  "author": "peter",
  "dependencies": {
    "canonical-json": "0.0.4",
    "espree": "1.11.0"
  },
  "license": "WTFPL",
  "main": "indexxxx.js",
  "scripts": {
    "test": "echo \"Error: no test specified\" && exit 1"
  }
}

[pdehaan]

Basically something like this (but I guess in CoffeeScript):

'use strict';

var exists = require('fs').existsSync;

var pkg = require('./package.json');

if (pkg.main) {
  checkFile(pkg.main);
}

if (pkg.bin) {
  switch (typeof pkg.bin) {
  case 'string':
    checkFile(pkg.bin);
    break;

  case 'object':
    Object.keys(pkg.bin).forEach(function (key) {
      checkFile(pkg.bin[key]);
    });
    break;
  }
}

function checkFile(file) {
  if (!exists(file)) {
    console.error('%s doesn\'t exist.', file);
  }
}

Not sure if there are other fields in package.json that may point to specific paths, but those would probably be good to lint to, if any of this is a good idea.

[Kikobeats]

I put this in the backlog for the next version :-)