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TypeScriptͰ ίϚϯυϥΠϯ
 ύʔαʔ NodeֶԂ34ݶ໨ ҏ౻ɹӯ

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ࣗݾ঺հ • ҏ౻ɹӯ (͍ͱ͏ɹ͖͋ͱʣ • @akito0107 • όοΫΤϯυΤϯδχΞ • Go / TypeScriptΛॻ͍͍ͯ·͢ • https://blog.akito0107.dev

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໨࣍ • ίϚϯυϥΠϯύʔαʔΛ࡞ͬͨ࿩ • ͳͥ࡞͔ͬͨ • Demo • ࢖͍ํʹ͍ͭͯ

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Node.jsͰ
 ίϚϯυϥΠϯπʔϧΛ࡞Δ • ҎԼͷΑ͏ͳϥΠϒϥϦ͕༗໊ • substack/minimist • tj/commander • cacjs/cac • yargs/yargs • ෳࡶͳΦϓγϣϯΛύʔε͢Δͱ͖ʹਏ͍

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Option Hell • ex) kubectl


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Sub command΋ ͭΒ͍

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ίϚϯυϥΠϯͷΦϓγϣϯ • ͋Δఔ౓ෳࡶͳίϚϯυΛ࣮૷͠Α͏ͱͨ͠ ৔߹ɺΦϓγϣϯͷ਺͕Ͳ͏ͯ͠΋๲Ε্ ͕ͬͯ͠·͏ • طଘϥΠϒϥϦͰෳࡶͳΦϓγϣϯΛѻ͓͏ ͱ͢Δͱݫ͍͠(ͱࢥͬͯΔ)

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ex) commander

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ex) commander ܕ͕΄͍͠ʂʂʂʂ

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ܕ͕ͭ͘΍ͭΛ࡞ͬͨ • https://github.com/akito0107/marron-glace • σϞ

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ϑϥάͷఆٛͷ࢓ํ • makeStringFlag / makeBooleanFlag … • ͜ΕΒͷؔ਺ʹɺϑϥάͷ໊લͱΦϓγϣϯ ʢσϑΥϧτ࣌ͷ஋ɺhelpͰදࣔ͢Δจݴͳ ͲʣΛ౉͢

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<= Stringͷͱ͖͸stringҎ֎ڐ༰͠ͳ͍ <=helpͷͱ͖ͷจݴ <= -s Ͱ΋ड͚ΒΕΔΑ͏ʹ —flag1 ͷϑϥάΛఆٛ —flag2 ͷϑϥάΛఆٛ

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ϑϥάͷreduce • reduceFlagͰෳ਺ͷϑϥάΛ·ͱΊΔ • reduceFlagͷฦΓ஋΋flagͳͷͰɺ࠶౓ reduce͢Δ͜ͱ͕Ͱ͖Δ

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makeCommand • flagΛmakeCommandͷύϥϝʔλʹ౉͢ <= ͜ͷ͋ͨΓ͸helpͰग़͢΍ͭ

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(positional)Arguments • `mv src target` ͷsrc, targetͷΑ͏ʹɺίϚϯ υʹΘͨ͢Ҿ਺΋ܕ෇͖Ͱαϙʔτ

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makeCommandʹΘͨ͢ <= ͜͜ʹิ׬͕ޮ͘

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Sub commands • makeSubcommandHandlerΛ࢖͏ <= ͜͜ʹsubCommandΛ͍ΕΔ

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Sub commandΛ࡞Δ <= ਌ίϚϯυͷflag <= subίϚϯυͷflag ↑ ਌ίϚϯυͱreduce͢Δ <- ਌ίϚϯυͷflagͱ
 subίϚϯυͷflag͕྆ํ࢖͑Δ

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ͦͷଞ • —helpͰϔϧϓίϚϯυ • ಠࣗܕͷflag • ৄ͘͠͸ϒϩάʹ

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·ͱΊ • TypeScriptܕਪ࿦͕όϦόϦޮ͘ίϚϯυϥ ΠϯπʔϧΛ࡞ͬͨ • όάͳͲ͋Γ·ͨ͠Β࿈བྷ͍ͯͩ͘͠͞ʂ

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͋Γ͕ͱ͏͍͟͝·ͨ͠