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PostCSS and cssnext
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Masaaki Morishita
November 26, 2015
Programming
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PostCSS and cssnext
at html5j, 61th.
Masaaki Morishita
November 26, 2015
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Transcript
PostCSS'ͱ'cssnext @morishi(er_
About&me • Masaaki'Morishita • Twi.er:'@morishi.er_ • GitHub:'morishi.er • Blog:'h.p:/ /morishi.er/hatenablog.com
• αΠόʔΤʔδΣϯτʢ৽ଔ1ʣ • PostCSSΤόϯδΣϦετʢࣗশʣ
None
Blog
None
PostCSSͰ࡞ͬͨͷ • CSSfmt:((S)CSSίʔυܗπʔϧ • AtCSS:(Annota/ons(based(CSS(processor • postcss7style7guide:(ελΠϧΨΠυδΣωϨʔλʔ • ଞϓϥάΠϯ7ͭ
Agenda 1. PostCSSͱ 2. PostCSSͷྺ࢙ 3. PostCSSͷύϑΥʔϚϯε 4. PostCSSπʔϧ 5.
cssnext 6. ·ͱΊ
PostCSSͱ
Over%7000%!%on%GitHub
None
None
None
͍͕͋Δ!
PostCSS'ͱ • by$Andrey$Sitnik • Node.jsͷCSSύʔαʔ • ASTΛૢ࡞͢ΔศརAPIΛఏڙ • ASTͷૢ࡞શͯϓϥάΠϯ͕୲
PostCSSͷॲཧͷྲྀΕ
PostCSSͷྺ࢙
PostCSSͷΑ͏ͳπʔϧੲ͔Β͋ͬͨ…
rework Plugin'framework'for'CSS'preprocessing
Modular(CSS(preprocessing( with(rework h"p:/ /tjholowaychuk.tumblr.com/post/ 44267035203/modular=css=preprocessing=with= rework
Custom'CSS'preprocessing h"p:/ /nicolasgallagher.com/custom4css4 preprocessing/
rework&(in&2012) • AndreyreworkΛͬͯAutoprefixerΛ࡞ͬͨ • ͔࣌͠͠reworkϒϥβϋοΫΛύʔεͰ͖ͳ͔ͬͨ • ʢ͋ͱTJʹAutoprefixerΛdisΒΕͨΓ…ʣ • ʮΑ͠ɺࣗͰreworkͷΑ͏ͳͷ࡞Ζ͏ʂʯ
PostCSS'ੜ
PostCSSʢʙ'v1ʣ • "PostCSS)is)a)framework)for)CSS)postprocessors" • AutoprefixerͷͨΊʹ࡞ΒΕͨ • ͜ͷࠒCoffeeScriptͰॻ͔Εͯͨ • ࡞ऀRuby͖ͰSass͖
PostCSS'(v2'ʙ'v4) • ϓϥάΠϯ͕େྔʹ࡞ΒΕ͍ͯ͘ • ݴޠ֦ுͷͨΊͷϓϥάΠϯ࡞ΒΕ͍ͯ͘ • cssnext,)AtCSS,)PreCSS • ʮϙετϓϩηεͱ͍͍ͬͨ…ʯ
None
PostCSS'v5
PostCSS'v5 • ࠓ·ͰͰҰ൪େ͖͍มߋ • Custom'Syntaxes • CSSҎ֎ͷߏจΛύʔεͰ͖ΔΑ͏ʹͳͬͨ • (reworkશʹΦϫίϯʹ)
Custom'Syntaxes • postcss'scss • SCSS༻ͷύʔαʔ • postcss'js • JSΦϒδΣΫτͱͯ͠ఆٛͨ͠CSSͷύʔαʔ •
͍ΘΏΔCSS,in,JS༻
PostCSSͷύϑΥʔϚϯε
ϓϦϓϩηοαʔͱͯ͠ postcss&nested*+*postcss&simple&vars*+*postcss&calc*+*postcss&mixins
CSSύʔαʔͱͯ͠
ϕϯμʔϓϦϑΟοΫε༩πʔϧͱͯ͠ CompassΑΓ50ഒҎ্͍ ϕϯμʔϓϦϑΟοΫε༩ͷͨΊ͚ͩʹCompassΛ͍ͬͯΔ ͳΒૣࣺͯ͘Δ͖
PostCSS'is'Fast h"ps:/ /github.com/postcss/benchmark
PostCSSπʔϧ
ۀͰPostCSSπʔϧϓϥάΠϯΛ Έ߹Θ͍ͤͯͬͯ͘
Autoprefixer ʮCan$I$Useʯͱ͍͏αΠτͷσʔλΛࢀ র͍ͯ͠Δ input: .flex { display: flex; } output:
.flex { display: -webkit-box; display: -webkit-flex; display: -ms-flexbox; display: flex; }
stylelint ϞμϯͳCSSͷLintπʔϧ Custom'proper+escalc()ʹରԠ ESLintͷΑ͏ʹॊೈͳઃఆ͕Ͱ͖Δ
cssnano CSSͷminifyπʔϧ ͍͔ͭ͘ͷPostCSSͷϓϥάΠϯ͔ΒͰ͖ ͍ͯΔ
PreCSS PostCSSϓϦϓϩηοαʔ Sass$like$syntax • ηϨΫλʔͷωετදه • mixin • extend •
for,#each • if
CSS#Modules CSSͷελΠϧͷӨڹൣғΛίϯϙʔω ϯτͰด͡Α͏ͱ͢ΔࢼΈ • webpackͷcss*loaderΛͬͯηϨΫλ ΛBase64ͰΤϯίʔυ • composesͷػೳΛPostCSSΛͬͯ ࣮ CSS#Modules#ॴײ
h"p:/ /morishi"er.hatenablog.com/entry/ 2015/09/28/103334
CSSfmt CSSϑΥʔϚολʔ • ະདྷͷCSSͷه๏ɺSCSSه๏ʹରԠ • ϑΥʔϚοςΟϯάͷΦϓγϣϯ͕Ұ ͳ͍ h"ps:/ /github.com/morishi"er/cssfmt ϩΰืूதʂʂ
cssnext Use$tomorrow's$CSS$syntax,$ today. h"p:/ /cssnext.io/
cssnext
cssnext • by$Maxime$Thirouin • ݱࡏࡦఆஈ֊Ͱϒϥβ͕ະ࣮ͷCSSͷه๏Λɺࠓͷϒϥ β͕ղऍͰ͖ΔΑ͏ʹτϥϯεύΠϧ͢Δπʔϧ • PostCSS
cssnext ͍͔ͭ͘ͷPostCSSϓϥάΠϯ͔ΒͰ͖͍ͯΔ • Custom(proper,es • Custom(media(queries • Custom(selectors • color(),(hwb(),(gray()
• Autoprefixer • etc...
Custom'proper+es input: :root { --color: red; } div { color:
var(--color); } output: div { color: red; }
Custom'media'queries input: @custom-media --small-viewport (max-width: 30em); @media (--small-viewport) { /*
styles for small viewport */ } output: @media (max-width: 30em) { /* styles for small viewport */ } • ϝσΟΞΫΤϦʔͷmax%width:,30emͱ͔ʹ໊લΛ͚ͯཧ ͢Δ͜ͱ͕Ͱ͖·͢ɻ
Media&query&ranges input: @media screen and (width >= 500px) and (width
<= 1200px) { .foo { display: block; } } output: @media screen and (min-width: 500px) and (max-width: 1200px) { .bar { display: block; } }
Custom'selectors input: @custom-selector :--heading h1, h2, h3; article :--heading +
p { margin-top: 0; } output: article h1 + p, article h2 + p, article h3 + p { margin-top: 0; }
Color%func*on input: body { background: color(red a(90%)) } output: body
{ background: rgba(255, 0, 0, 0.9) }
cssnextΛ͏ͱ'ະདྷͷCSSͷγϯλοΫεΛ ઌऔΓͰ͖Δ
tabatkins(/(specs by#Tab#Atkins#Jr. h"ps:/ /github.com/tabatkins/specs
tabatkins(/(specs • CSS$Toggle$States • CSS$Nes.ng • CSS$Aliases$(custom$stuff) • CSS$will9change$Property •
CSS$Font$Rendering$Controls • etc...
CSS#@apply#Rule#(by#postcss2apply) :root { --toolbar-theme: { background-color: hsl(120, 70%, 95%); border-radius:
4px; border: 1px solid var(--theme-color late); }; --toolbar-title-theme: { color: green; }; } .toolbar { @apply --toolbar-theme; } .toolbar > .title { @apply --toolbar-title-theme; }
CSS#Extend#Rule#(by#postcss4extend) .error { color: red; border: thick dotted red; }
.serious-error { @extend .error; font-weight: bold; }
·ͱΊ
PostCSSͱ • PostCSSࣗମͨͩͷύʔαʔ • ύʔαʔͱͯ͠ͱͯྑ͍ • ASTͷૢ࡞શͯϓϥάΠϯ͕୲ • ·͋·͍͋ •
Stylusͷ4ഒ,/Ruby/Sassͷ26ഒ • Compassͷ50ഒҎ্
PostCSSπʔϧ • Autoprefixer • stylelint • cssnano • PreCSS •
CSS5Modules • CSSfmt
PostCSS.parts h"p:/ /postcss.parts
cssnext • ະདྷͷCSSΛઌऔΓʂ࠷ߴʂ • Custom)proper-es • Custom)media)queries • Custom)selectors •
color(),)hwb(),)gray() • etc...
※͔͜͜ΒݸਓͷײͰ͢
PostCSSʹ͍ͭͯ • ύʔαʔͱͯ͠ͱͯ༏ल • ͜Ε͔ΒCSSܥͷπʔϧΛ࡞Δͱ͖PostCSSΛ͏ • ඞཁͳػೳʢϓϥάΠϯʣ͚ͩΛબͯ͑͠Δ • ʮSassΛ͍ͬͯΔ͚Ͳ@extend@mixinΘͳ͍ʯ •
ʮมఆٛͱ@importͷΠϯϥΠϯల։͚ͩͰ͍͍Θʔʯ
ͨͩ…
PostCSSʹ͍ͭͯ • γϯλοΫεγϡΨʔܥͷϓϥάΠϯ͕ଟ͍ • ࠷ۙωλܥ૿͖͍͑ͯͯΔ • ϓϥάΠϯಉ࢜ʹґଘ͕ؔ͋Δ • ʮpostcss-mixinspostcss-nestedΑΓઌʹಡΈࠐΈ ·͠ΐ͏ʯ
ࡶʹPostCSSϓϥάΠϯΛͬͨΠϝʔδ
cssnextʹ͍ͭͯ • ະདྷͷCSSΛઌऔΓʂ$Ͱͳ͍ • CSSͷ༷ॻ͜Μͳʹബ͘ͳ͍ • cssnextͰମײͰ͖ΔͷγϯλοΫεͷॻ͖৺͙Β͍ • Extensible$Webͷจ຺ͰޠΒΕΔ͜ͱ͋Δ͕ɺPostCSSͰ Ͱ͖Δ͜ͱগͳ͍
cssnextʹ͍ͭͯ • cssnextϙϦϑΟϧ(Ͱͳ͍ • ػೳ͕࣮͞Ε͍ͯͳ͍ϒϥβͰ͑ΔΑ͏ʹ͢Δͷ ͡Όͳ͍ • ࠓͷϒϥβ͕ղऍͰ͖ΔCSSʹม͢Δ߹ɺͰ͖Δ͜ͱ গͳ͍ •
HoudiniͷCSS(Parser(APIʹظ
cssnextʹ͍ͭͯ • cssnextϓϦϓϩηοαʔ • ଞͷϓϦϓϩηοαʔͱಉ༷ʹɺग़ྗޙͷCSSΛҙࣝͯ͠ॻ ͘ඞཁ͕͋Δ • JSͷBabelײ֮Ͱ༻͢Δͱةݥ
Thanks':D @morishi(er_