Parse the closest package.json file (upwards and downwards the tree) and returns whether a package is a dependency or not.

Needed to check whether if a project has react-native as a dependency or not.

yarn add is-package-dep # or npm i is-package-dep --save

const isPackageDep = require('is-package-dep');

const isRNProject = isPackageDep('react-native'); // value will be either `true` or `false`

Returns a boolean value that holds whether the package is installed or not.

Type: string The name of the package.

Type: string Default: process.cwd() Directory to start looking up for the package.json file.

MIT © Lucas Bento

Thanks to Sindre Sorhus for read-pkg-up module.