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.

JS class extension tool for enabling easily extending prototype with multiple objects.

Parse CSS inline style to JavaScript object.

Useful utility functions for CSS in JS solutions

Extend native Error to create custom errors

Generate hashes from javascript objects in node and the browser.

As close to cssnext @extend as possible for PostCSS

A CSS Modules transform to extract export statements from local-scope classes

Returns true if an object was created by the `Object` constructor, or Object.create(null).

Extend constructors using backbone's .extend signature

Support for import attributes in acorn

jQuery.extend with configurable behaviour for arrays

ES2015 `Object.assign()` ponyfill

Better handling for window object in SSR environment

Deep extend utility designed for use with JSON data.

Easily handle defaults for your options

An object schema merger/validator

Extend an object with the "has own property"'s of other object(s)

Backbone like Class.extend utility for Node