Does this JS environment support the `name` property on functions?
Is this value a JS Set? 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.
Does this environment have the ability to get the [[Prototype]] of an object on creation with `__proto__`?
correct invalid SPDX expressions
Which kind of Typed Array is this JavaScript value? Works cross-realm, without `instanceof`, and despite Symbol.toStringTag.
Which kind of Collection (Map, Set, WeakMap, WeakSet) is this JavaScript value? Works cross-realm, without `instanceof`, and despite Symbol.toStringTag.
Is this value a JS Boolean? This module works cross-realm/iframe, and despite ES6 @@toStringTag.
TypeScript definitions for assert
Is this value a JS Number object? This module works cross-realm/iframe, and despite ES6 @@toStringTag.
Is this value negative zero? === will lie to you
Is this value a JS Date object? This module works cross-realm/iframe, and despite ES6 @@toStringTag.
TypeScript definitions for power-assert
Determine if a value is an ES6 Symbol or not.
Assert that two Node-API typed array data types are equal.
Is this value a JS Map? This module works cross-realm/iframe, and despite ES6 @@toStringTag.
Is this value a JS WeakRef? This module works cross-realm/iframe, and despite ES6 @@toStringTag.
Is this value an ES BigInt?
Get and robustly cache all JS language-level intrinsics at first require time
Returns true if a value has the characteristics of a valid JavaScript data descriptor.
assert with status codes
Get the byteLength out of a DataView, robustly.
Get the ArrayBuffer out of a TypedArray, robustly.
Is this an arguments object? It's a harder question than you think.