Test if a value is a BigInt.
Is this value a JS Set? This module works cross-realm/iframe, and despite ES6 @@toStringTag.
Is this value a JS Boolean? This module works cross-realm/iframe, and despite ES6 @@toStringTag.
Rich matchers inspired by Hamcrest. Useful for generating helpful assertion failure messages in tests.
Test if an input value is a supported built-in ndarray data type string.
Is this value a JS WeakSet? This module works cross-realm/iframe, and despite ES6 @@toStringTag.
Convert a Node-API value to a single-precision floating-point array.
Define a non-enumerable read-only property.
Returns true if a value has the characteristics of a valid JavaScript descriptor. Works for data descriptors and accessor descriptors.
Is this value a JS WeakMap? This module works cross-realm/iframe, and despite ES6 @@toStringTag.
The node.js assert module, re-packaged for web browsers.
Is this value negative zero? === will lie to you
Is this value a JS Number object? This module works cross-realm/iframe, and despite ES6 @@toStringTag.
Detect native Symbol.hasInstance support.
Is this value a JS Date object? This module works cross-realm/iframe, and despite ES6 @@toStringTag.
Boolean constructor.
Compute the absolute value of a double-precision floating-point number.
Return the real and imaginary components of a single-precision complex floating-point number.
Determine the name of a value's constructor.
Test if a value is an empty collection.
Determine if a value is an ES6 Symbol or not.
Is this value a JS WeakRef? This module works cross-realm/iframe, and despite ES6 @@toStringTag.
Is this value a JS Map? This module works cross-realm/iframe, and despite ES6 @@toStringTag.
Check if the runtime is a web browser.