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array-buffer-byte-length

Get the byte length of an ArrayBuffer, even in engines without a `.byteLength` method.

available-regexp-flags

Which regular expression flags does the current environment support?

available-typed-arrays

Returns an array of Typed Array names that are available in the current environment.

buffer-equal

data-view-buffer

Get the ArrayBuffer out of a DataView, robustly.

data-view-byte-length

Get the byteLength out of a DataView, robustly.

data-view-byte-offset

Get the byteOffset out of a DataView, robustly.

deep-equal-json

`deep-equal`, but only for JSON-supported values.

defined

functions-have-names

Does this JS environment support the `name` property on functions?

get-symbol-description

Gets the description of a Symbol. Handles `Symbol()` vs `Symbol('')` properly when possible.

has-bigints

Determine if the JS environment has BigInt support.

has-dynamic-import

Does the current environment have `import()` support?

has-named-captures

Does the JS environment support named capture groups in regexes?

has-object-spread

check if the environment supports { ...a } spread syntax

has-optional-chaining

Determine if the JS environment has optional chaining support

has-override-mistake

Determine whether the environment has the so-called "override mistake" - [[Set]]ing a property whose ancestor is nonwritable throws.

has-package-exports

Does the current node version have support for the "exports" field in package.json?

has-package-imports

Does the current node version have support for the "imports" field in package.json?

has-package-self-reference

Does the current node version have support for requiring/importing its own name?

has-private-fields

Determine if the JS environment has private fields (`class { #x; }`) support.

has-property-descriptors

Does the environment have full property descriptor support? Handles IE 8's broken defineProperty/gOPD.

has-proto

Does this environment have the ability to get or set the [[Prototype]] of an object with `__proto__`?

has-strict-mode

Does the current JS environment have strict mode? ES5+ should; but let's not assume.

has-symbols

Determine if the JS environment has Symbol support. Supports spec, or shams.

has-template-literals

Determine if the JS environment has template literal support

has-tostringtag

Determine if the JS environment has `Symbol.toStringTag` support. Supports spec, or shams.

has-typed-arrays

Determine if the JS environment has Typed Arrays.

hasown

A robust, ES3 compatible, "has own property" predicate.