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51 packages found
Get the native type of a value.
Test if a value is a boolean.
A simple set of functions that return a boolean.
Returns `true` if the value is a primitive.
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.
Isomorphic, functional type-checking for Javascript
Boolean data type has two possible truth values to represent logic.
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
A utility to determine if a value is a boolean
Check if a string is a datetime string.
Ask for a type, returns a true/false as answer.
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 {web}.
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.
Test if a value is an array-like object of booleans.