ES6 (a.k.a. Harmony) Features Implemented in V8 and Available in Node

Recent version of V8 started to implement ES6 features and thus have become available in recent versions of Node, with a watershed moment when ES6 generator functions have become available in Node 0.11. This page is meant to track and list these features, and how to use them.

Generators (--harmony_generators)

Collections (--harmony_collections sets, maps, and weak maps)

Proxies (--harmony_proxies)

Modules (--harmony_modules)

Scoping (--harmony_scoping)

Observation (--harmony_observation)

Symbols (--harmony_symbols)

Iteration (--harmony_iteration)

Other

--harmony_typeof (enable harmony semantics for typeof)
--harmony_typed_arrays (enable harmony typed arrays)
--harmony_array_buffer (enable harmony array buffer)
--harmony_numeric_literals (enable harmony numeric literals (0o77, 0b11))
--harmony_strings (enable harmony string)
--harmony_arrays (enable harmony arrays)