Update package.json just like npm does
Simple way to to update
package.json files exactly like
Reads and parses the JSON file at
filename, then passes the data to
updateCallback should modify the data as it sees fit before
returning (it must be synchronous, this restriction may be relaxed in the
updateCallback returns, the data will be serialized to JSON and
written back to
If reading or parsing the file fails,
updateCallback will not be called, and
callback will be called no arguments.
If writing the file fails,
callback will be called with the error.