Gridsome向けの ESLintパッケージを作って公式に組み込まれた話

by Tyankatsu

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Gridsome޲͚ͷ ESLintύοέʔδΛ࡞ͬͯ ެࣜʹ૊Έࠐ·Εͨ࿩

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ࣗݾ঺հ • νϟϯΧπ(@tyankatsu5) • ϕΨίʔϙϨʔγϣϯ • ϑϩϯτΤϯυΤϯδχΞ • GridsomeͷϑΝϯ • eslint-plugin-gridsomeͷ  ίϥϘϨʔλʔ • ӳޠษڧத • ӡӦɿFrontEnd-Fukuoka.spec, Ξχϝʔγϣϯݚڀ ձ

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Ұ؏ͯ͠Δ͜ͱ

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͋Ε͹࢖͏ ͳ͚Ε͹࡞Δ

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ࠓ೔࿩͢͜ͱ • Gridsomeͷ঺հ • ESLintͷϧʔϧ࡞੒ͷܾ·Γ͝ͱ • Pluginͱͯ͠npmͰެ։͢ΔྲྀΕ • ASTͱ͔parserͱ͔

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ࠓ೔࿩͞ͳ͍͜ͱ • Gridsome޲͚ͷESLintύοέʔδΛ࡞ͬͯެࣜʹ૊ Έࠐ·Εͨ࿩ • eslint-conﬁg-xxxͷ࡞Γํ • scoped packageͷ࡞Γํ

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Gridsomeͱ͸

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Gridsomeͱ͸ʢͬ͘͟Γʣ • ReactͷGatsbyʹӨڹΛड͚ͨSSG(Static Site Generator) • LazyLoadΛ౥ࡌͨ͠g-imageɺϖʔδͷઌಡΈΛ͢ Δg-linkͳͲΛఏڙ • API΍mdϑΝΠϧ͔Βऔಘͨ͠σʔλΛม׵ͯ͠ɺ GraphQLͰΞΫηεՄೳʹ͢Δ • GraphQL͸component͔ΒಠࣗϒϩοΫͰΞΫηε Մೳ

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https://gridsome.org/docs/how-it-works

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GraphQL͸component͔Β ಠࣗϒϩοΫͰΞΫηεՄೳ

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ݒ೦఺ • ಠࣗͷϒϩοΫ͔ͩΒPrettierΈ͍ͨͳformatter͕ͳ ͍ • ಠࣗͷϒϩοΫ͔ͩΒLinterΈ͍ͨͳRule͕ͳ͍

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ͦͷޙͷྲྀΕ eslint-plugin-gridsomeΛ࡞ͬͨ - Tyankatsu Sketch Book https://tyankatsu.netlify.com/posts/create-eslint- plugin-gridsome

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ESLintͷPluginΛ࡞Δ

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ඞཁ஌ࣝ • parser • AST • ESLintͷPlugin࡞੒࣌ͷܾ·Γ͝ͱ • Test

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ESLintͷparserΛ஌Δ

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ESLintͷparserΛ஌Δ • parser = ߏจղੳث • EsprimaΛϑΥʔΫͨ͠Espreeͱ͍͏parserΛ࢖༻ ͍ͯ͠Δ • SFC(.vue)ͷ৔߹͸vue-eslint-parserʢ಺෦͸Espree ͱ౳Ձʣͱ͍͏parserΛ࢖༻͢Δ • parser͸ଞʹ΋Acornɺ@babel/parser(چBabylon) ͱ͔

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mysticatea/vue-eslint-parser

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ASTΛ஌Δ

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ASTΛ஌Δ • parseͨ݁͠ՌͰந৅ߏจ໦ͷ͜ͱ • JSͷparser͸େମESTreeʹجͮ͘ASTΛग़ྗ͢Δ

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const tyankatsu = ‘spinach’;

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ESLintͷplugin࡞੒࣌ͷ جຊͷྲྀΕ https://eslint.org/docs/developer-guide/ working-with-plugins

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ESLintͷplugin࡞੒࣌ͷ جຊͷྲྀΕ • RuleఆٛϑΝΠϧΛ࡞Δ • TestΛॻ͘ • ҰͭͷJSϑΝΠϧʹRuleΛ·ͱΊͯExport • package.jsonͷmainϑΟʔϧυʹͦͷJSͷύεΛॻ ͘ • npmͰύοέʔδެ։

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RuleఆٛϑΝΠϧΛ࡞Δ https://eslint.org/docs/developer-guide/working-with- rules

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RuleఆٛϑΝΠϧΛ࡞Δ • ObjectΛExport͢Δ • େ͖͘metaϓϩύςΟͱcreateϝιουʹ෼͔ΕΔ

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meta • metaϓϩύςΟࣗମΦϓγϣϯͳͷͰॻ͔ͳͯ͘΋ ಈ͘ • type,docs,fixable,schema,deprecated,replacedBy͕ ೖΔ • fixable͕ͳ͍ͱɺ--fix ͰfixͰ͖ͳ͍

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create • ϧʔϧͷఆٛ • Ҿ਺ʹcontext͕ೖΔ • context͔Βੜ͍͑ͯΔϓϩύςΟͱϝιουΛ returnͯ͠࡞Δ • AST͔Βཉ͍͠nodeΛऔಘ͢Δศརͳϝιουͱ͔ ΛESLint͕ఏڙͯ͠Δ

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TestΛॻ͘

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TestΛॻ͘ • Mocha্Ͱeslint͕ఏڙͯ͠Δςελʔ(RuleTester) Λ࢖༻ͯ͠ςετ࣮ߦ • validͰ੒ޭύλʔϯ,invalidͰࣦഊύλʔϯΛςετ • ﬁxͤ͞Δ৔߹͸invalidͷதͷoutputʹਖ਼͍͠ίʔυ Λॻ͘

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varΛconstͱletʹ͢ΔΑ͏ʹ ܯࠂ͢ΔRuleʢଈڵʣ

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ҰͭͷJSϑΝΠϧʹ RuleΛ·ͱΊͯExport

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ҰͭͷJSϑΝΠϧʹ RuleΛ·ͱΊͯExport • ObjectΛExport͢Δ • rulesϓϩύςΟͷΩʔʹϧʔϧ໊ɺ஋ʹϧʔϧΛ requireͨ͠΋ͷΛࢦఆ • େମ lib/index.js

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package.jsonͷmainϑΟʔ ϧυʹͦͷJSͷύεΛॻ͘

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package.jsonͷmainϑΟʔϧυ ʹͦͷJSͷύεΛॻ͖·͢

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npmͰύοέʔδެ։

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npmͰύοέʔδެ։ • ύοέʔδ໊͸ eslint-plugin-xxxxਪ঑  (eslintrcͰύοέʔδͷࢦఆָ͕ʹͳΔ)

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eslint-plugin-gridsome Λ࡞ͬͯΈͯ

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eslint-plugin-gridsome Λ࡞ͬͯΈͯ • ެࣜυΩϡϝϯτͰΘ͔Βͳ͍৔߹͸eslint-jpͰ࣭໰ ͢ΔखஈΛߟྀ • AST explorerΛݟͳ͕Β࡞ۀ • npm publish͸CIʹ೚ͤΔͱָ • ϩʔΧϧͳΒnpָ͕ • ϧʔϧͷdocsΛӳޠͰॻ͘ͷ͠ΜͲ͍

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eslint-plugin-gridsome ͷࠓޙ

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eslint-plugin-gridsome ͷࠓޙ • ϧʔϧΛ࡞Δ্ͰศརʹͳΔUtilityΛ࡞Γ͍ͨ • ࣗಈԽग़དྷΔՕॴ͸script࡞͍͖͍ͬͯͨ • GridsomeͷఏڙίϯϙʔωϯτΛνΣοΫͰ͖Δ rule࡞Γ͍ͨ

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·ͱΊ

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·ͱΊ • ϧʔϧΛ૿΍͢͜ͱ͸؆୯ • ެ։΋؆୯ • ESLint࢖͏ଆ͚ͩ͡Όͳͯ͘࡞Δଆʹ΋ཱͬͯΈΑ ͏ʂʂʂ

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͓ΘΓ