Just checking if package.json contains a given package.
does_my_project_have_mocha = require('pkg-has')('mocha');or use a wide search
const findings = require('pkg-has').wideSearch('cha');
// findings = ["mocha", "chai"]installation : yarn add pkg-has
sudo yarn global add pkg-has
it will test against the package.json based on the current position, so if you are in a directory of your project it will test with your package.json as you would expect. But now if you are in a dependency directory structure (e.g. ./node_modules/chai), it will test against this dependency package.json. So beware.