Npm cache checker

Simple Promise-based utility to check if npm packages are cached.

Example below will grab dependencies from package.json and check if those packages are cached.

var cacheChecker = new CacheChecker();

cacheChecker.then(function(result) {
  // result is true or false
});

Optionally, you can point to package.json of your choosing.

var cacheChecker = new CacheChecker('path/to/package.json');

cacheChecker.then(function(result) {
  // result is true or false
});