Is this value a JS DataView? This module works cross-realm/iframe, does not depend on `instanceof` or mutable properties, and despite ES6 Symbol.toStringTag.
Test if a value is a BigInt.
Determine a value's type.
Compute the absolute value of a double-precision floating-point number.
Test if an input value is a supported built-in ndarray data type string.
Detect native Symbol.hasInstance support.
Test if a finite double-precision floating-point number is a nonnegative integer.
Constant function.
Determine the name of a value's constructor.
Test if an input value is a supported ndarray real-valued data type.
Power Assert output formatter
Check if the runtime is a web browser.
Is this value a JS WeakSet? This module works cross-realm/iframe, and despite ES6 @@toStringTag.
Rich matchers inspired by Hamcrest. Useful for generating helpful assertion failure messages in tests.
Is this value a JS Set? This module works cross-realm/iframe, and despite ES6 @@toStringTag.
Returns true if a value has the characteristics of a valid JavaScript descriptor. Works for data descriptors and accessor descriptors.
Check if the runtime is Node.js.
Is this value a JS Boolean? This module works cross-realm/iframe, and despite ES6 @@toStringTag.
Is this value a JS WeakMap? This module works cross-realm/iframe, and despite ES6 @@toStringTag.
Is this value negative zero? === will lie to you
The node.js assert module, re-packaged for web browsers.
Is this value a JS Number object? This module works cross-realm/iframe, and despite ES6 @@toStringTag.
Is this value a JS Date object? This module works cross-realm/iframe, and despite ES6 @@toStringTag.
Determine if a value is an ES6 Symbol or not.