dependency-db

A database for querying which packages depend on a specific package within a specific range.

Installation

npm install dependency-db --save

When upgrading from version 4, remember to purge the LevelDB index.

Usage

var memdb = require('memdb')
var DependencyDb = require('dependency-db')
 
var db = new DependencyDb(memdb())
 
// pkg should be a package.json style object
var pkg = {
  name: 'foo',
  version: '1.2.3',
  dependencies: {
    bar: '^2.3.4'
  }
}
 
db.store(pkg, function (err) {
  if (err) throw err
 
  db.query('bar', '^2.0.0', function (err, pkgs) {
    if (err) throw err
 
    console.log('Found %d dependents:', pkgs.length)
 
    pkgs.forEach(function (pkg) {
      console.log('- %s@%s', pkg.name, pkg.version)
    })
  })
})

API

var db = new DependencyDb(levelup)

Initialize the DependencyDb constructor with a levelup database instance.

db.store(pkg, callback)

Store a package in the database.

The first argument is a package.json style JavaScript object. Only the name and version properties are required. If dependencies is present, it should adhere the the regular package.json format.

The callback will be called with an optional error object as the first arguement when the package have been processed and stored correctly in the database.

var stream = db.query(name, range[, options][, callback])

Query the database for packages that depend on name within the given range.

The optional options argument can contain the following properties:

• devDependencies - Look up dev-dependencies instead of dependencies (default: false)
• all - Return all versions of all packages that matches the queried dependency
• gt - Used for pagination. Only return results greater than the given dependent (format: dependent or dependent@version)
• limit - Used for pagination. Max number of results to return (default: -1, no limit)

If provided, the callback will be called with an optional error object as the first arguement and an array of packages that match the query as the second.

Alternatively you can use the returned object-stream to stream the results:

db.query('roundround', '*').on('data', function (result) {
  console.log(result)
})

Warning: OR-queries are not supported. This means that the range argument must not contain a double pipe operator (||). If an OR-range is given an error is thrown.

License

MIT