In progress features can be activated individually by their respective harmony flag, although this is highly discouraged unless for testing purposes.Staged features, which are almost-completed features that are not considered stable by the V8 team, require a runtime flag: -harmony.All shipping features, which V8 considers stable, are turned on by default on Node.js and do NOT require any kind of runtime flag.By keeping up-to-date with the latest releases of this engine, we ensure new features from the JavaScript ECMA-262 specification are brought to Node.js developers in a timely manner, as well as continued performance and stability improvements.Īll ECMAScript 2015 (ES6) features are split into three groups for shipping, staged, and in progress features: Node.js is built against modern versions of V8.
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