Gajus Gajus - 4 months ago 30
Node.js Question

How to enable all node.js harmony "in progress" features?

node --v8-options | grep harmony
--es_staging (enable all completed harmony features)
--harmony (enable all completed harmony features)
--harmony_shipping (enable all shipped harmony fetaures)
--harmony_modules (enable "harmony modules" (in progress))
--harmony_regexps (enable "harmony regular expression extensions" (in progress))
--harmony_proxies (enable "harmony proxies" (in progress))
--harmony_sloppy_function (enable "harmony sloppy function block scoping" (in progress))
--harmony_sloppy_let (enable "harmony let in sloppy mode" (in progress))
--harmony_unicode_regexps (enable "harmony unicode regexps" (in progress))
--harmony_reflect (enable "harmony Reflect API" (in progress))
--harmony_destructuring (enable "harmony destructuring" (in progress))
--harmony_default_parameters (enable "harmony default parameters" (in progress))
--harmony_sharedarraybuffer (enable "harmony sharedarraybuffer" (in progress))
--harmony_atomics (enable "harmony atomics" (in progress))
--harmony_simd (enable "harmony simd" (in progress))
--harmony_array_includes (enable "harmony Array.prototype.includes")
--harmony_tostring (enable "harmony toString")
--harmony_concat_spreadable (enable "harmony isConcatSpreadable")
--harmony_rest_parameters (enable "harmony rest parameters")
--harmony_sloppy (enable "harmony features in sloppy mode")
--harmony_arrow_functions (enable "harmony arrow functions")
--harmony_new_target (enable "harmony new.target")
--harmony_object_observe (enable "harmony Object.observe")
--harmony_spreadcalls (enable "harmony spread-calls")
--harmony_spread_arrays (enable "harmony spread in array literals")
--harmony_object (enable "harmony Object methods")


comes with a lot of features that are disabled by default (either because they are still in development or are in staging). The
--harmony
flag enables all completed features.

How to enable all "in progress" features?

Answer

You could have a look at what flags are currently "in progress" with

node --v8-options | grep "in progress"

The output as of this post looks like

--harmony_modules (enable "harmony modules" (in progress))
--harmony_array_includes (enable "harmony Array.prototype.includes" (in progress))
// ...
// (I've removed the other lines, which look like the above)

So you could easily parse it to suit your needs.

On the subject: https://nodejs.org/en/docs/es6/#which-features-are-in-progress

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