nginx modules:

*) Feature: introduced global "ngx" object.
   The following methods were added:
     ngx.log(level, msg)

   The following properties were added:
     ngx.INFO,
     ngx.WARN,
     ngx.ERR.

*) Feature: added support for Buffer object where string
   is expected.

*) Feature: added Buffer version of existing properties.
   The following properties were added:
   r.requestBuffer (r.requestBody),
   r.responseBuffer (r.responseBody),
   r.rawVariables (r.variables),
   s.rawVariables (s.variables).

   The following events were added in stream module:
   upstream (upload),
   downstream (download).

*) Improvement: added aliases to existing properties.
   The following properties were added:
   r.requestText (r.requestBody),
   r.responseText (r.responseBody).

*) Improvement: throwing an exception in r.internalRedirect()
   for a subrequest.

*) Bugfix: fixed promise r.subrequest() with error_page redirect.

*) Bugfix: fixed promise events handling.

Core:

*) Feature: added TypeScript definitions for builtin
   modules.
   Thanks to Jakub Jirutka.

*) Feature: tracking unhandled promise rejection.

*) Feature: added initial iterator support.
   Thanks to Artem S. Povalyukhin.

*) Improvement: TypeScript definitions are refactored.
   Thanks to Jakub Jirutka.

*) Improvement: added forgotten support for
   Object.prototype.valueOf() in Buffer.from().

*) Bugfix: fixed heap-use-after-free in JSON.parse().

*) Bugfix: fixed heap-use-after-free in JSON.stringify().

*) Bugfix: fixed JSON.stringify() for arrays resizable via
   getters.

*) Bugfix: fixed heap-buffer-overflow for
   RegExp.prototype[Symbol.replace].

*) Bugfix: fixed returned value for Buffer.prototype.write*
   functions.

*) Bugfix: fixed querystring.stringify().
   Thanks to Artem S. Povalyukhin.

*) Bugfix: fixed the catch handler for
   Promise.prototype.finally().

*) Bugfix: fixed querystring.parse().