Search results
1769 packages found
Returns true if a value has the characteristics of a valid JavaScript descriptor. Works for data descriptors and accessor descriptors.
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.
Check if something is a Node.js stream
Returns true if an object was created by the `Object` constructor, or Object.create(null).
unist utility to check if a node passes a test
Check if a value is a plain object
Type check values
Runtime library to validate data against TypeScript interfaces
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
type-check allows you to check the types of JavaScript values at runtime with a Haskell like type syntax.
Get the native type of a value.
Returns true if a number or string value is a finite number. Useful for regex matches, parsing, user input, etc.
Function argument validation for humans
- type
- types
- check
- checking
- guard
- guards
- assert
- assertion
- predicate
- predicates
- is
- validate
- validation
- utility
- View more
Standard assertion utilities.
- stdlib
- stdassert
- assertion
- assert
- expectation
- expect
- utilities
- utility
- utils
- util
- test
- check
- validate
- validation
- View more
Returns true if the value is an object and not an array or null.
Detect the file type of a Buffer/Uint8Array/ArrayBuffer
Check if a path is a file, directory, or symlink
Check if something is a generator function
Infer the content-type of a request.