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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).
What is the type of this builtin JS value?
unist utility to check if a node passes a test
Check if a value is a plain object
Type check values
Determines if an object can be used as an array
Returns true if a number or string value is a finite number. Useful for regex matches, parsing, user input, etc.
Infer the content-type of a request.
Check if something is a generator function
Get the native type of a value.
Returns true if the value is an object and not an array or null.
Determine if an object is a Stream
Determine if an object is a Buffer
- arraybuffer
- browser
- browser buffer
- browserify
- buffer
- buffers
- core buffer
- dataview
- float32array
- float64array
- int16array
- int32array
- type
- typed array
A simple utility to Check the value is number or can convert to a number, for example string ' 123 ' can be converted to 123.
Standard assertion utilities.
- stdlib
- stdassert
- assertion
- assert
- expectation
- expect
- utilities
- utility
- utils
- util
- test
- check
- validate
- validation
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