Exists Packages

Ensures that elements exists on the page based on jquery promise and search

If the key exists then get it's value. Otherwise put the key and value in the db and then get the value.

Check if a command exists

Pattern matching object structures

Allows parsing of an existential check in Babel

If there is, without error checking

Check if file exists

Find, count or verify uppercase and lowercase words in a string

Node module to check synchronously if a command-line command exists

deep checking for existence

SQL is designed for managing or stream processing data in an RDBMS.

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.

Check if a word exists or not in English

File path validation and normalization

An AMD (Require.js) and browser compatible jQuery plugin to check more easily and better whether an element (or many) exists.

Check if a git remote repository exists

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.

Captures a folder/file based on a path.

Check for a Yarn lockfile in the current working directory.

continuously test if a process exists