Harmony flags

  Node 6.10.5
  --harmony (enable all completed harmony features)
  --harmony_shipping (enable all shipped harmony features)
  --harmony_array_prototype_values (enable "harmony Array.prototype.values" (in progress))
  --harmony_function_sent (enable "harmony function.sent" (in progress))
  --harmony_sharedarraybuffer (enable "harmony sharedarraybuffer" (in progress))
  --harmony_simd (enable "harmony simd" (in progress))
  --harmony_do_expressions (enable "harmony do-expressions" (in progress))
  --harmony_restrictive_generators (enable "harmony restrictions on generator declarations" (in progress))
  --harmony_regexp_named_captures (enable "harmony regexp named captures" (in progress))
  --harmony_regexp_property (enable "harmony unicode regexp property classes" (in progress))
  --harmony_for_in (enable "harmony for-in syntax" (in progress))
  --harmony_trailing_commas (enable "harmony trailing commas in function parameter lists" (in progress))
  --harmony_class_fields (enable "harmony public fields in class literals" (in progress))
  --harmony_regexp_lookbehind (enable "harmony regexp lookbehind")
  --harmony_tailcalls (enable "harmony tail calls")
  --harmony_string_padding (enable "harmony String-padding methods")
  --harmony_async_await (enable "harmony async-await")
  --harmony_restrictive_declarations (enable "harmony limitations on sloppy mode function declarations")
  --harmony_object_values_entries (enable "harmony Object.values / Object.entries")
  --harmony_object_own_property_descriptors (enable "harmony Object.getOwnPropertyDescriptors()")

Node 7.10.0
  --harmony (enable all completed harmony features)
  --harmony_shipping (enable all shipped harmony features)
  --harmony_default_parameters (nop flag for "harmony default parameters")
  --harmony_destructuring_assignment (nop flag for "harmony destructuring assignment")
  --harmony_destructuring_bind (nop flag for "harmony destructuring bind")
  --harmony_regexps (nop flag for "harmony regular expression extensions")
  --harmony_proxies (nop flag for "harmony proxies")
  --harmony_reflect (nop flag for "harmony Reflect API")
  --harmony_tostring (nop flag for "harmony toString")
  --harmony_array_prototype_values (enable "harmony Array.prototype.values" (in progress))
  --harmony_object_observe (enable "harmony Object.observe" (in progress))
  --harmony_function_sent (enable "harmony function.sent" (in progress))
  --harmony_sharedarraybuffer (enable "harmony sharedarraybuffer" (in progress))
  --harmony_simd (enable "harmony simd" (in progress))
  --harmony_do_expressions (enable "harmony do-expressions" (in progress))
  --harmony_regexp_property (enable "harmony unicode regexp property classes" (in progress))
  --harmony_string_padding (enable "harmony String-padding methods" (in progress))
  --harmony_regexp_lookbehind (enable "harmony regexp lookbehind")
  --harmony_tailcalls (enable "harmony tail calls")
  --harmony_object_values_entries (enable "harmony Object.values / Object.entries")
  --harmony_object_own_property_descriptors (enable "harmony Object.getOwnPropertyDescriptors()")
  --harmony_exponentiation_operator (enable "harmony exponentiation operator `**`")
  --harmony_function_name (enable "harmony Function name inference")
  --harmony_instanceof (enable "harmony instanceof support")
  --harmony_iterator_close (enable "harmony iterator finalization")
  --harmony_unicode_regexps (enable "harmony unicode regexps")
  --harmony_regexp_exec (enable "harmony RegExp exec override behavior")
  --harmony_sloppy (enable "harmony features in sloppy mode")
  --harmony_sloppy_let (enable "harmony let in sloppy mode")
  --harmony_sloppy_function (enable "harmony sloppy function block scoping")
  --harmony_regexp_subclass (enable "harmony regexp subclassing")
  --harmony_restrictive_declarations (enable "harmony limitations on sloppy mode function declarations")
  --harmony_species (enable "harmony Symbol.species")
  --harmony_instanceof_opt (optimize ES6 instanceof support)