Node Streamでメモリ性能改善、そしてWeb Streams APIへ / Improving memory performance of the CLI tool using Node Stream

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/PEF4USFBNͰϝϞϦੑೳվળ ͦͯ͠8FC4USFBNT"1*΁ $ Z C P [ V ' S P O U F O E % B Z α Π Ϙ ΢ ζ ג ࣜ ձ ࣾ L J O U P O F % 9 ν ʔ Ϝ U B T T I J

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ࣗݾ঺հ • UBTTIJ ా୅խ࣏ • ॴଐ • αΠϘ΢ζגࣜձࣾ • LJOUPOF %9νʔϜ • झຯ • ήʔϜ🎮 • ࣗసं🚴

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LJOUPOF%9νʔϜ • LJOUPOFฐࣾఏڙͷΫϥ΢υαʔϏε • %9։ൃऀମݧ %FWFMPQFSF9QFSJFODF • LJOUPOFͷΤίγεςϜ։ൃऀͷ%9޲্ • 4%,ͷఏڙɾอक 044 • ґଘϥΠϒϥϦ΁ͷ$ POUS JC VUJPO • ٕज़ελοΫ • /PEFKT 5ZQF4DSJQU F UDʜ

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/PEF4USFBN

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/PEF4USFBNͱ͸ • /PEFͰετϦʔϜೖग़ྗΛߦ͏ͨΊͷΠϯλʔϑΣʔε • ετϦʔϜ͸σʔλΛ෼ׂ͞Εͨখ͍͞୯ҐʢDIVOLʣ ͷ࿈ଓͨ͠ྲྀΕͱͯ͠ѻ͏΋ͷ • ͔ͳΓੲ͔Β͋Δ֓೦ͰେମͲͷݴޠʹ΋͋Δ • 4USFBN͕͋Δ͕ɺࠓճ࿩͢ͷ͸4USFBN • /PEF W

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/PEF4USFBN͸େ͖͘छྨ • 3FBEBCMFಡΈऔΓՄೳͳσʔλετϦʔϜ • 8SJUBCMFॻ͖ࠐΈՄೳͳσʔλετϦʔϜ • %VQMFY5SBOTGPSN • ಡΈऔΓՄೳ͔ͭॻ͖ࠐΈՄೳͳσʔλετϦʔϜ • 5S BOTGPS N͸ड͚औͬͨνϟϯΫʹม׵Λߦͬͯૹग़͢Δ ΄΅%VQMFYͱҰॹ͚ͩͲม׵ॲཧΛ࣮૷͠΍͘͢ͳ͍ͬͯΔ ʢDPOTUS VDUPS΍USBOTGPSN@USBOTGPSN ʣ • Կ΋͠ͳ͍1BTT5ISPVHI΋͋Δ

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4USFBNΛQJQF Ͱܨ͙͚ͩͰॲཧ͕ॻ͚Δ SFBEBCMF QJQF USBOTGPSN" UP# QJQF USBOTGPSN# UP$ QJQF XSJUBC MF

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4USFBNͷϝϦοτ • গͳ͍ϝϞϦͰॲཧͰ͖Δ • ඇಉظॲཧʹର్ͯ͠தͰॲཧΛڬΊΔ • ֎͔Β1SPHSF TTΛऔಘͨ͠Γɺ$ BODF Mͨ͠ΓͰ͖Δ • ্ྲྀɾԼྲྀͰฒߦʹॲཧΛߦ͑ΔͨΊɺ௿஗Ԇ ʮ4USFBNΛ੍͢Δ΋ͷ͸ɺ/PEFKTΛ੍͢ʯ ʢΒ͍͠ʣ

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4USFBNͷσϝϦοτ • ֶशίετ͕ߴ͍ • ಉظॲཧ΍BTZODBXBJUͱͷ૬ੑ͕ѱ͍ • 4USF BN͸&WF OU&NJUUF S͕ϕʔεʢΠϕϯτۦಈύϥμΠϜʣ • ಉظॲཧʹॲཧʹ૊ΈࠐΈʹ͍͘ • ΤϥʔϋϯυϦϯά͕೉͍͠ • ͦͷଞɺ࢖ͬͯΈͯؾʹͳͬͨͱ͜Ζ͸ޙड़

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"TZOD*UFSBUPSͱBXBJUPG • 4USFBNΛಉظॲཧʹ͏·͘૊ΈࠐΈ͍ͨ • 4USFBN͸4ZNCPMBTZOD*UFSBUPSΛ͍࣋ͬͯΔ • ͜ΕΛGPSBXBJUPGͰDPOTVNFͰ͖Δ GPSBXBJU DPOTUDIVOLPGSFBEBCMF \ DPOTPMFMPH DIVOL ^

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DMJLJOUPOFͰͷಋೖ

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DMJLJOUPOF • LJOUPOF͔ΒϨίʔυΛΠϯϙʔτΤΫεϙʔτ͢Δ ίϚϯυϥΠϯπʔϧ • σʔλόοΫΞοϓ΍ଞجװγεςϜͱͷ࿈ܞʹར༻

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ϝϞϦ࢖༻ྔͷ໰୊ • WϦϦʔε࣌ʹ͸શϨίʔυΛϝϞϦʹࡌͤͯॲཧ • ެ։ޙ͠͹Β͘͸ݕূ໨తͰͷར༻͕ϝΠϯͱ൑அ • ύϑΥʔϚϯεվળ͸௥࣮ͬͯࢪ͍ͯ͘͠༧ఆͩͬͨ • ެ։͔Βϲ݄ͰϝϞϦ࢖༻ྔʹؔ͢Δ໰͍߹Θͤ • ਺ສ݅Λ௒͑ΔϨίʔυͰͷ࣮ߦͰ +BWB4DSJQUIF BQPVUPGNF NPSZ ͕ൃੜ

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ύϑΥʔϚϯεվળલ • શͯͷϨίʔυΛऔಘˠม׵ˠॻ͖ग़͠

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վળํ਑ • DMJLJOUPOF͸$-*πʔϧͰ΄΅શͯ௚ྻ • Π ϕ ϯ τ υ Ϧ ϒ ϯ ʹ ͢ Δ ඞ ཁ ੑ ͸ ௿ ͍ • Ұ ఆ ݅ ਺ ͣ ͭ ϧ ʔ ϓ ճ ͠ ͯ ॲ ཧ ͠ ͨ Β ͍ ͍ ͷ Ͱ ͸ ʁ • ҎԼͷཧ༝Ͱ෦෼తʹ4USFBNΛ࠾༻ͨ͠ • ݁ ہ 4 U S F B N ͷ ࠶ ࣮ ૷ ʹ ͳ Γ ͦ ͏ ͩ ͬ ͨ ͜ ͱ • 4 U S F B N ඇ ޓ ׵ ͩ ͱ 4 U S F B N ४ ڌ ͷ ϥ Π ϒ ϥ Ϧ ͕ ࢖ ͑ ͳ ͍ • ক དྷ త ʹ ͸ ฒ ྻ ॲ ཧ ʹ ͳ Δ Մ ೳ ੑ ΋ ͋ Δ ͨ Ί • SFTUBQJDMJFOU͕4USFBNඇରԠ • G T ͔ Β ಡ Έ ग़ ͠ ˠ L J O U P O F Ϩ ί ʔ υ ΁ ͷ ม ׵ Λ 4 U S F B N Ͱ ॲ ཧ • Ҏ ߱ ͸ G P S B X B J U Ͱ ಉ ظ ॲ ཧ ʹ ૊ Έ ࠐ Ή

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ύϑΥʔϚϯεվળޙ • %BUB4PVSDFΛఆٛ • GPSBXBJUͰDIVOL͝ͱʹΞοϓϩʔυ GPSBXBJU DPOTUDIVOLPGEBUB4PVSDFSFBEFS \ VQMPBE3FDPSET DIVOL ^

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%BUB4PVSDF • ಺ ෦ ʹ 3 F B E B C M F ͱ 5 S B O T G P S N Λ Q J Q F ͠ ͨ ΋ ͷ Λ อ ࣋ • M F O H U I શ ݅ ૸ ࠪ ͠ ɺ ݅ ਺ Λ ฦ ͢ • S F B E F S ಺ ෦ ͷ 4 U S F B N 5 S B O T G P S N Λ ฦ ͢

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ύϑΥʔϚϯεൺֱʢΠϯϙʔτʣ

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ύϑΥʔϚϯεൺֱʢΤΫεϙʔτʣ

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ΊͪΌͪ͘ΌੑೳվળͰ͖ͨʂʂ

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/PEF4USFBNؾʹͳͬͨͱ͜Ζ • 4USFBNΛ߹੒ͯͭ͠ͷ4USFBNʹ͢Δ҆ఆͳํ๏͕ͳ͍ • 4USF BNDPNQPTF 4UBHF • 1VNQJGZͳͲͷ֎෦ϥΠϒϥϦ • 8FC4USFBNT" 1*ͩͱ؆୯ʹͰ͖Δ • DIVOLͷܕ͕BOZ • 8SJUBCMF3FBEBCMF Λܧঝͯ͠ܕΛ౰ͯΕͦ͏͚ͩͲେม • QJQFݩ͕FSSPSDMPTFͯ͠΋QJQFઌ͸ࣗಈͰDMPTF͠ͳ͍ • &SSPSΠϕϯτϋϯυϥͰQJQFઌ΋EF TUPSZ͢Δ

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GTύοέʔδͰؾʹͳͬͨͱ͜Ζ • GJMFIBOEMFDSFBUF3FBE4USFBN • G E Λ ։ ͍ ͨ · · ʹ ͠ ͯ ɺ ݎ ࿚ ʹ ॲ ཧ Λ ਐ Ί ͨ ͍ • σ ϑ Υ ϧ τ Ͱ B V U P $ M P T F U S V F ˠ ಡ Έ ऴ ͑ ͨ Β G E ͕ ด ͡ Δ • G E Λ ࢖ ͍ ճ ͢ ʹ ͸ ɺ D S F B U F 3 F B E 4 U S F B N ͢ Δ ৔ ॴ શ ͯ Ͱ ඞ ͣ B V U P $ M P T F G B M T F Λ ઃ ఆ ͠ ͳ ͍ ͱ ͍ ͚ ͳ ͍ • GEͷด͡๨Ε͸ྑ͘໰୊ʹͳΔ͚Ͳɺ ؒҧͬͯด͡ͳ͍Α͏ʹ͢Δͷ΋ϛεͦ͠͏ʢײ૝ʣ • E F T U S V D U P S U S Z X J U I S F T P V S D F ͕ ͳ ͍ ͷ Ͱ σ ϑ Υ ϧ τ ด ͡ Δ ͷ ͕ ҆ શ ͳ ͷ ͔ ΋ ͠ Ε ͳ ͍ • V T J O H ͕ ೖ Δ ͱ ͜ ͷ ͋ ͨ Γ ͷ Ϧ ι ʔ ε ؅ ཧ ͸ ָ ʹ ͳ Δ ͔ ΋

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8FC4USFBNT"1* 4UBCJMJUZ • 8FCඪ४ͷ4USFBNT"1* • /PEFW ͔Β&YQF SJNF OUBM8BSOJOH͕ग़ͳ͘ͳͬͨ • Կ͕خ͍͔͠ • ੔ཧ͞Εͨ" 1* • *TPNPSQIJD 6OJWF STBM ͳίʔυ͕ॻ͖΍͘͢ͳΔ • DIVOLʹରͯ͠ܕ͕ࢦఆͰ͖Δʢ(F OF SJDTʣ • OQNύοέʔδ͝ͱͰαϙʔτঢ়گ͸·ͪ·ͪ • /PEF4USFBNͱม׵ՄೳͳͷͰ͋·Γ໰୊ʹͳΒͳ͍͔΋ʁ • *TPNPSQIJD 6OJWF STBM จ຺ͩͱࠔΓͦ͏

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֤छ4USFBNͷ૬ޓม׵

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·ͱΊ • /PEF4USFBNΛ࢖ͬͯϝϞϦ࢖༻ྔΛ௒վળͯ͠ΈͨΑ • ΋ͬͱฒྻͰ৭ʑͳॲཧΛ͢Δඞཁ͕͋Δ ΞϓϦέʔγϣϯͩͱߋʹޮՌΛൃشͦ͠͏ • 8FC4USFBNT"1*΋৮͍͖͍ͬͯͨ

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ࢀߟࢿྉ • 4 U S F B N c / P E F K T W % P D V N F O U B U J P O • I U U Q T O P E F K T P S H B Q J T U S F B N I U N M • ε τ Ϧ ʔϜ " 1 * 8 F C " 1 * c . % / • I U U Q T E F W F M P Q F S N P [ J M M B P S H K B E P D T 8 F C " 1 * 4 U S F B N T @ " 1 * • 4 U S F B N ࠓ ੲ ෺ ޠ G S P N T D S B U D I • I U U Q T Z P T V L F G V S V L B X B I B U F O B C M P H D P N F O U S Z • I J H I 8 B U F S . B S L ͔ Β ୳ Δ / P E F K T ͷ 4 U S F B N ͷ ࢓ ૊ Έ :B I P P + " 1" / 5F D I # M P H • I U U Q T U F D I C M P H Z B I P P D P K Q B E W F O U D B M F O E B S O P E F T U S F B N I J H I X B U F S N B S L • 4 U S F B N * O U P U I F ' V U V S F / P E F + 4 4 U S F B N T :P V 5 V C F • I U U Q T X X X Z P V U V C F D P N X B U D I W B 5 & % $ P U D O

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͓·͚ • TUSFBN3FBEBCMFXSBQ ͷίϝϯτ