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51 packages found
Get the native type of a value.
Test if a value is a boolean.
Returns `true` if the value is a primitive.
A simple set of functions that return a boolean.
Set of shortands of Object.prototype.toString for fast and simple type check
Check if an URL is a valid HTTP URL.
A robust micro library for type checking. Defers to constructs' internal `[[Class]]` property rather than duck typing for excellent type detection and to avoid triggering false positives.
Boolean data type has two possible truth values to represent logic.
Isomorphic, functional type-checking for Javascript
A utility to determine if a value is a boolean
List of all javascript types. Used and useful for checking, validation, sanitizing and testing. Like isStream, isPromise, isWeakset and etc.
- bool
- boolean
- buffer
- check
- checking
- error
- is
- is-boolean
- is-buffer
- is-error
- is-promise
- is-stream
- json
- kind
- View more
Check if a string is a datetime string.
Ask for a type, returns a true/false as answer.
Boolean data type has two possible truth values to represent logic {web}.
A robust micro library for type checking. Defers to constructs' internal `[[Class]]` property rather than duck typing for excellent type detection and to avoid triggering false positives.
Check whether a value is a `Generator` or `GeneratorFunction`. The `co` way, more strict checking. Always return boolean true or false, never null or undefined.
- check
- es2015
- es6
- es7
- function
- functions
- generator
- generatorfunction
- generators
- is
- is-function
- is-generator
- is-generator-function
- next
Returns an object with a `negated` boolean and the `!` stripped from negation patterns. Also respects extglobs.
Ask for a type, returns a true/false as answer.
Takes any JavaScript data type or object as an input and returns a string describing the type of the input.
Boolean indicating if the current process is running on Windows.