Valid Packages

Returns true if a value has the characteristics of a valid JavaScript accessor descriptor.

Returns true if a value has the characteristics of a valid JavaScript data descriptor.

Returns true if a value has the characteristics of a valid JavaScript descriptor. Works for data descriptors and accessor descriptors.

Convert a string to a valid safe filename

Return true if a value is a valid glob pattern or patterns.

Isomorphic, functional type-checking for Javascript

Returns true if a windows file path has invalid characters.

Returns true if a file path does not contain any invalid characters.

Check whether a RegExp flag is supported

Test component compliance with web accessibility standards

Detect if a string is a data URL

A simple and composable way to validate data in JavaScript (and TypeScript).

Returns true if a value is a valid instance of Base.

Convert a URL to a valid filename

Wrapper around is-valid-instance and is-registered for validating `base` plugins. Returns true if `app` is a valid instance of base and a plugin is not registered yet.

Validates if a value is an array.

Is given string a language code (as per IANA)

Validates if a value is a string primitive.

Validates if a value is a nonnegative integer.

Validates if a value is a number primitive, excluding NaN.