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3462 packages found
TypeScript-first schema declaration and validation library with static type inference
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.
ECMAScript “ToPrimitive” algorithm. Provides ES5 and ES2015 versions.
- primitive
- abstract
- ecmascript
- es5
- es6
- es2015
- toPrimitive
- coerce
- type
- object
- string
- number
- boolean
- symbol
- View more
Check if something is a Node.js stream
What is the type of this builtin JS value?
unist utility to select nodes with CSS-like selectors
Media Type Database
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
Type check values
Detect the file type of a Buffer/Uint8Array/ArrayBuffer
Check if a value is a plain object
Determines if an object can be used as an array
Get the native type of a value.
Determine if an object is a Stream
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.