Node.js v13の気になる変更点 / #kng8

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Node.js v13 Notable Changes ؔ੢NodeֶԂ 8࣌ݶ໨ Masashi Hirano(@shisama)

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ฏ໺ ণ࢜ / Masashi Hirano @shisama_ shisama Node.js Core Collaborator ؔ੢NodeֶԂOrganizer

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https://twitter.com/nodejs/status/1186695960753266689

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https://github.com/nodejs/Release 2019/10/21 2020/10 2022/4 2019/10/22 2020/6

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Node.js v13ͷಛʹؾʹͳͬͨ มߋ఺Λ঺հ͠·͢ʂ

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https://nodejs.org/en/blog/release/v12.0.0/

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https://github.com/nodejs/node/pull/29694

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V8 7.8 • Objectͷ෼ׂ୅ೖ (`const {id, name} = user;`)ͳͲͷύϑΥʔϚϯεվ ળ • ϝϞϦ࢖༻ྔͷ࡟ݮ • WebAssembly (WASM) ͷC/C++ͷAPIΛެࣜαϙʔτɺWASMͷى ಈ࣌ؒվળ • …etc

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https://v8.dev/blog/v8-release-78 More details… => v8.dev

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Internationalization

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https://github.com/nodejs/node/pull/29522

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Internationalization • i18nΛϑϧαϙʔτ  ɾv12·Ͱ͸Intlܥͷؔ਺ͷҰ෦΍NumberͷtoLocaleString()ͳͲ͸ӳޠͷΈ࢖͑ͨ • ͜Ε·Ͱ͸͢΂ͯͷݴޠαϙʔτΛ͠ͳ͍Α͏ʹNode.jsΛϏϧυ͍ͯͨ͠  ɾNode.jsͷόΠφϦͷαΠζ͕૿͑ΔͨΊආ͚ΒΕ͍ͯͨ  ɾϑϧαϙʔτ͢ΔϏϧυʹΑΓ~40%αΠζ͕૿͑Δ  ɾe.g. macOSͩͱ35MB͔Β49MBʹͳΔ • v12·Ͱ΋ —with-intl=full-icu ϑϥάΛ෇͚ͯNode.jsΛϏϧυ͢Δ͜ͱͰϑϧαϙʔτͰ͖ ͍ͯͨ

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https://nodejs.org/api/intl.html

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Intl.DateTimeFormatͷεϖΠϯޠͰͷྫ const january = new Date(9e8); const spanish = new Intl.DateTimeFormat('es', { month: 'long' }); console.log(spanish.format(january)); // 'M01' v12 // 'enero` v13 WҎલ TNBMMJDV Ͱ͸`.`ɺ WҎ߱ GVMMJDV Ͱ͸`FOFSP`

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http

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https://github.com/nodejs/node/pull/29522

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http parser • ॳظ͔Β͋ͬͨHTTPύʔαʔͷhttp_parserϞδϡʔϧΛ࡟আ • v12͔Βllhttp͕σϑΥϧτ͕ͩɺ—http-parser=legacy Φϓ γϣϯΛ෇͚Δ͜ͱͰhttp_parser͕࢖͑ͯͨ • v13͔Β—http-parser Φϓγϣϯ΋࡟আ͞Εͨ

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https://llhttp.org

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llhttp • http_parserͷอक͕ࠔ೉ͩͬͨͷͰҰ͔Βॻ͖௚͞Εͨ • llhttp͸TypeScriptͰॻ͔Ε͍ͯͯϝϯς͠΍͘͢ͳ͍ͬͯΔ • http_parserΑΓ࣮ߦ଎౓͕଎͍ • llparseͰTS͔ΒCݴޠ΍LLVMϏοτίʔυʹม׵͍ͯ͠Δ

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llhttp https://github.com/nodejs/llhttp

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More details… => JSConf EU 2019 https://2019.jsconf.eu/fedor-indutny/llhttp-new-http-11-parser-for-nodejs.html

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http, http2

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https://github.com/nodejs/node/pull/27558

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αʔόʔλΠϜΞ΢τͷ࣌ؒ • ͜Ε·Ͱ͸σϑΥϧτ2෼ͰλΠϜΞ΢τ͍ͯͨ͠ • αʔόʔͰ2෼Λ௒͑ΔॲཧΛ͢Δͱιέοτ͕ด͡ΒΕۭͷϨεϙϯε ͕ฦ͖ͬͯͨ • v13͔Β͸αʔόʔλΠϜΞ΢τ͕ແޮʹͳͬͨ • ͜Ε·Ͱ௨Γserver.setTimeoutͳͲͰλΠϜΞ΢τ·Ͱͷ࣌ؒΛઃఆ͢ Δ͜ͱ͸Մೳ

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ES Modules

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https://github.com/nodejs/node/pull/29866

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ES Modules • ·ͩϦϦʔεʹؚ·Ε͍ͯͳ͍͕ɺv13ͰೖΓͦ͏ • ES Modules(import / export)͕ϑϥάͳ͠Ͱ࢖͑ΔΑ͏ʹ  ɾ—experimental-module ͕ඞཁͩͬͨ • v12ʹ΋ϚΠφʔόʔδϣϯͷߋ৽ͰόοΫϙʔτ͢Δ͔΋  ɾ12݄͕3݄ࠒʹ͸v12Ͱ΋ϑϥάͳ͠Ͱ࢖͑Δ͔΋

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https://github.com/nodejs/module/issue/400

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https://shisama.hatenablog.com/entry/2019/10/23/190842 ͦͷଞͷมߋ఺

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·ͱΊ • V8ͷߋ৽ͰύϑΥʔϚϯεվળͳͲ͕͞Εͨ • i18n͕ϑϧαϙʔτ͞Εͨ • http͸ݹ͍ύʔαʔΛ࡟আ͠ɺσϑΥϧτͰλΠϜΞ΢τແޮʹ • ES Modules͕ϑϥάͳ͠Ͱ࢖͑Δ༧ఆ