CHECK Packages

Validate glob options

Check the validity of the format of an EU VAT number

ESLint shareable config for XO with 2-space indent

Create an error from the result of validate-glob-opts

Checks that given package is installed globally or locally.

Match BCP 47 language tags with language ranges per RFC 4647

Context menu for your Electron app

3x as fast as `is-whitespace` and `whitespace-regex` thanks to `is-string-blank`. This package is a simple function that accepts an argument and returns `true` if it is a string AND it is not blank. Supports Node and Browser environments.

Upcast is a low-level JavaScript type checking and casting library

The hasNestedProperty method missing in Object. This module does not extend Object.

Check JavaScript code style with jscs

Validate the name of a custom element

Checkbox component for react native, it works on iOS and Android.

Check if a string is a valid filename

Hunspell compatible spell checker

Minimal JavaScript type checking library

ESLint shareable config for React to be used with eslint-config-xo

Determines whether a string ends with the characters of another string.

Validates if a value is undefined.

Returns `true` if a value exists in the given string, array or object.