Slide 1
Slide 1 text
Node.js v12
Notable Changes
ؔNodeֶԂ 6࣌ݶ
Masashi Hirano(@shisama)
Slide 2
Slide 2 text
ฏ ণ࢜ / Masashi Hirano
ɹɹɹɹ Kyoto office
@shisama_
@shisama
Node.js Core Collaborator
ؔNodeֶԂOrganizer
Slide 3
Slide 3 text
4/23ʹ12.0.0͕ϦϦʔε͞Ε·ͨ͠
Slide 4
Slide 4 text
https://nodejs.org/en/blog/release/v12.0.0/
݄ʹ-54ʹ
Slide 5
Slide 5 text
https://nodejs.org/en/blog/release/v12.0.0/
W&0-ʹ
Slide 6
Slide 6 text
Node.js v12ͷಛʹؾʹͳͬͨ
มߋΛհ͠·͢ʂ
Slide 7
Slide 7 text
https://nodejs.org/en/blog/release/v12.0.0/
/PEFKTͷެࣜϖʔδ(JU)VCͷ3FMFBTFϖʔ
δʹ1VMM3FRVFTUͷϦϯΫ͕షͬͯ͋Δ
Slide 8
Slide 8 text
https://github.com/nodejs/node/pull/26685
Slide 9
Slide 9 text
V8(JSΤϯδϯ)͕7.4ʹ
• Node.js v10ͷV86.8
• JavaScript(ECMAScript)৽ػೳ͕Ճ
• async / await͕ߴԽ
• async-stack-trace͕Ճ
etc…
Slide 10
Slide 10 text
https://twitter.com/mathias/status/1120700101637353473
JavaScript৽ػೳ
Slide 11
Slide 11 text
Array#{flat,flatMap}
var arr1 = [1, 2, [3, 4]];
arr1.flat();
// [1, 2, 3, 4]
arr1.flatMap(x => [x * 2]);
// [2, 4, 6, 8]
Slide 12
Slide 12 text
Private Class Field
class Counter {
#count = 0;
get value() {
return this.#count;
}
increment() {
this.#count++;
}
}
const counter = new Counter();
counter.increment();
counter.#counter; // Error
counter.value; // OK
QSJWBUFʹ͍ͨ͠ϑΟʔϧυʹΛ͚ͭΔ
Slide 13
Slide 13 text
https://twitter.com/mathias/status/1120700101637353473
ଞʹͨ͘͞Μ͋Γ·͢ʂଓ͖WebͰʂ
Slide 14
Slide 14 text
https://speakerdeck.com/ajido/callback-to-promise-and-beyond
લճˏAjido͞Μ͕ൃදͯ͘͠Ε·ͨ͠ʂ
Slide 15
Slide 15 text
https://blog.risingstack.com/node-js-12-new-features/
Async Stack Trace
Slide 16
Slide 16 text
https://blog.risingstack.com/node-js-12-new-features/
Async Stack Trace
v11
V12
Slide 17
Slide 17 text
https://github.com/nodejs/node/pull/26685
Slide 18
Slide 18 text
llhttp
• HTTPύʔαͷσϑΥϧτ͕http_parser͔Βllhttpʹ
• http_parserվྑΛࢼΈ͚ͨͲ͔ͬͨ͠
• llhttpTypeScriptͰॻ͔Ε͍ͯͯϝϯς͘͢͠ͳ͍ͬͯΔ
• http_parserΑΓ࣮ߦ͕͍
• llparseͰCݴޠLLVMϏοτίʔυʹม
Slide 19
Slide 19 text
llhttp
https://github.com/nodejs/llhttp
Slide 20
Slide 20 text
https://github.com/nodejs/node/pull/26209
εΫϦʔϯγϣοτ 2019-05-08 02.51.41.png
Slide 21
Slide 21 text
https://github.com/nodejs/node/pull/23814
Slide 22
Slide 22 text
tls
• TLS 1.3Λ৽͘͠αϙʔτ
• TLS1.0ɺ1.1σϑΥϧτͰαϙʔτର֎ʹ
• 2020/03ʹϝϯς͞Εͳ͘ͳΔ
• v12LTSͰ2022/04ͰEOL
Slide 23
Slide 23 text
https://github.com/nodejs/node/pull/25576
Slide 24
Slide 24 text
σϑΥϧτͷheapͷ࠷େ
• ैདྷ700MB(32bit) / 1400MB(64bit)ݻఆͩͬͨ
• v12͔Β༻ՄೳͳϝϞϦ༰ྔʹ߹Θͤͯ૿ݮ
Slide 25
Slide 25 text
https://github.com/nodejs/node/pull/23027
͜ͷޙɺొஃ༧ఆʂ
Slide 26
Slide 26 text
https://github.com/nodejs/node/pull/27361
/PEFKTWͰ
ྩରԠ͞Εͨ
Slide 27
Slide 27 text
Node.js v12ʹͳΔ͜ͱͰಈ͔ͳ͘ͳ
Δύοέʔδଘࡏ͢Δ
Slide 28
Slide 28 text
https://github.com/nodejs/node/issues/25060
Slide 29
Slide 29 text
Node.js v12ͰյΕΔύοέʔδ͕͋Δ
• uglify-jsbcryptͳͲ༗໊ͳͱ͜Ζ͕ର
• طʹରԠࡁͷͷ͋Δ
• CITGMͱ͍͏Node.js CoreͷCIδϣϒͰᖰΓग़͍ͯ͠Δ
• Α͘ΘΕΔύοέʔδͷςετ͕௨Δ͔ݕূ
• https://github.com/nodejs/citgm
• ੈͷதͷશͯͷnpmύοέʔδΛݕূ͍ͯ͠ΔΘ͚Ͱͳ͍
Slide 30
Slide 30 text
npmʹύοέʔδΛެ։͍ͯ͠Δਓ
Node.jsͷϝδϟʔόʔδϣϯ͕ϦϦʔ
ε͞ΕͨΒݕূͯ͠Έ·͠ΐ͏ʂ
Slide 31
Slide 31 text
·ͱΊ
• V8ͷόʔδϣϯΞοϓͰJavaScriptͷ৽ػೳ͕Ճ͞Εͨ
• Node.js Core෦తʹΞοϓσʔτ͞Ε͍ͯΔ
• ϝδϟʔόʔδϣϯnpmύοέʔδ͕յΕͨΓ͢ΔͷͰݕূ
͕ඞཁ
Slide 32
Slide 32 text
͝੩ௌ͋Γ͕ͱ͏͍͟͝·ͨ͠ʂ
@shisama_
@shisama