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Returns true if a value exists, false if empty. Works with deeply nested values using object paths.
Returns true if any values exist, false if empty. Works for booleans, functions, numbers, strings, nulls, objects and arrays.
What is the type of this builtin JS value?
Type check values
Determine if an object is a Stream
TypeScript-first schema declaration and validation library with static type inference
unist utility to check if a node passes a test
Runtime validation and processing of JavaScript types
Runtime library to validate data against TypeScript interfaces
Check if a value is a regular expression
Stringify an object/array like JSON.stringify just without all the double-quotes
Check if something is a promise
Isomorphic, functional type-checking for Javascript
A little library for asserting types and values, with zero dependencies.
- type
- types
- type-check
- type-checking
- duck-typing
- arguments
- parameters
- values
- data
- contract
- assert
- check
- verify
- safe
Convert an object or array into a formatted string
Returns `true` if the value is a primitive.
Check if a Buffer/Uint8Array is a GZIP file
Coalesce for JavaScript. Returns the first value that is not undefined or null.
the definitive JavaScript type testing library
Simple module to get instance type. Like a bit more advanced version of typeof