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Check if a URL is a valid and existent GitHub HTTP(s) URL
Script to check if the path is File or Directory. Return "Object Stats" or false
Check if the node module has exists
Check whether an email address exists.
A library that helps check for available nodes / providers. Useful for when you want to check a list of providers and see which ones are online.
Mongoose plugin to validate that ObjectID references refer to objects that actually exist in the referenced collection
Detect popular CLI on your computer. Is PHP exists? Is Node.js exists? and many more.
Promise based library to quickly find the first accessible file in a set of filenames and paths. Resolves both local and http(s) url paths.
🧵 Provides ways of checking whether a String is present in an Array of Strings using custom Comparators. 🔍
method_exists
Grunt task for validating if file(s) exist.
A command line wrapper for the npm [get-env package](https://www.npmjs.com/package/get-env), with an option for asserting that a particular environment be set.
Helper function using inquirer to validate whether a URL (or a username/repo pair) provided in a prompt refers to an existing GitHub repository
a package informer for npm modules and more
Asserts that a module exists
Extended `open` command with default dir set to current
deep checking for existence
insert a batch of keys if and only if none of the keys already exist
Returns true if a npm package exists in global node_modules.
Quantifiers of nullable types like as Array.prototype every/some