is-extendable
Returns true if a value is a plain object, array or function.
extendible
Extend constructors using backbone's .extend signature
extendo-error
Safely and simply extend native Error with prototype chaining support
koa-better-body
Full-featured [koa][] body parser! Support parsing text, buffer, json, json patch, json api, csp-report, multipart, form and urlencoded bodies. Works for koa@1, koa@2 and will work for koa@3.