Boolean.
APACHE-2.0 License
Test whether a path exists on the filesystem.
Test if an object's own property is readable and writable.
Test if an object's own property is writable.
Cube root of double-precision floating-point epsilon.
Test if a value is a Float64Array.
Standard string unicode constants.
Test if a value is Node readable stream-like.
Boolean indicating if the current process is running on Windows.
Simple, light-weight assertions framework for javascript
Test if two arguments have the same native class.
Standard input.
Boolean indicating if the current process is running on Darwin.
Define a read-only property.
Test if a value is a ReferenceError object.
Test if an object's own or inherited property is enumerable.