Upgrade to Pro
— share decks privately, control downloads, hide ads and more …
Speaker Deck
Speaker Deck
PRO
Sign in
Sign up
for free
ビルドプロセスから考えるCSSアンチパターン
Kenji Imamula
November 25, 2018
Technology
3
870
ビルドプロセスから考えるCSSアンチパターン
HTML5 Conference 2018の発表資料です。
Kenji Imamula
November 25, 2018
Tweet
Share
More Decks by Kenji Imamula
See All by Kenji Imamula
kimamula
1
460
Other Decks in Technology
See All in Technology
chaspy
1
480
tsugimot
0
170
terurou
0
240
seto_hi
0
140
i35_267
0
280
becolomochi
0
170
mukai21
2
590
ufoo68
0
110
k1low
1
600
kolinz
0
110
yunon_phys
1
470
hololab
0
360
Featured
See All Featured
zenorocha
296
40k
philnash
8
510
keavy
106
14k
lauravandoore
437
28k
moore
125
21k
frogandcode
127
20k
ammeep
656
54k
colly
187
14k
zakiwarfel
88
3.3k
cromwellryan
101
5.9k
eitanlees
111
9.9k
marcelosomers
220
15k
Transcript
Ϗϧυϓϩηε͔Βߟ͑Δ CSSΞϯνύλʔϯ HTML5 Conference 2018 גࣜձࣾΧϒΫ ࠓଜݠ࢜ @kimamula
CSSͷΛ͠·͢
ϑϩϯτΤϯυΤϯδχΞͱCSSͱࢲ CSSಘҙ CSSۤख
CSSಘҙ CSSۤख ࢲ ϑϩϯτΤϯυΤϯδχΞͱCSSͱࢲ
ͦΜͳࢲͰ͕͢
৭ʑ͋ͬͯɺ CSSͱਅʹ͖߹Θͳ͚Ε ͳΒͳ͍ͱ͖͕͖ͨ…
ϲ݄ܦա
ؾ͕͍ͭͨ͜ͱ
Flexbox, Grid LayoutΛ͑ CSSͦΜͳʹͭΒ͘ͳ͍
Flexbox, Grid LayoutΛ͑ CSSͦΜͳʹͭΒ͘ͳ͍ ͜ͷ͠·ͤΜ
Ϗϧυϓϩηε͔Βߟ͑Δͱɺ CSSͷઃܭ͕ߟ͍͑͢
Ϗϧυϓϩηε͔Βߟ͑Δͱɺ CSSͷઃܭ͕ߟ͍͑͢ ͜ͷΛ͠·͢
Ϗϧυϓϩηε͔Βߟ͑Δ CSSΞϯνύλʔϯ
Ξϯνύλʔϯ1
ίϯϙʔωϯτϕʔεͳͷʹ CSSάϩʔόϧ
ͦͦCSSͱ͖߹͏͜ͱ Λܾҙͨ͠ݩڟݪҼͷҰͭ
• ϑϩϯτΤϯυ։ൃίϯϙʔωϯτϕʔε͕ ओྲྀ • ࠶ར༻ • είʔϓׂ ίϯϙʔωϯτϕʔε։ൃ
ͦΜͳதɺCSS͚ͩάϩʔόϧ άϩʔόϧ ίϯϙʔωϯτ ͱ͔ ಠࣗͷCSSͱ͔
άϩʔόϧ ίϯϙʔωϯτ ͱ͔ ಠࣗͷCSSͱ͔ ͦΜͳதɺCSS͚ͩάϩʔόϧ ͜ͷґଘόϯυϥʔ ͔Βݟ͑ͳ͍
όϯυϥʔʹΑΔޮతͳ code splitting͕Ͱ͖ͳ͍ • ଟ͔Εগͳ͔ΕΘΕ͍ͯͳ͍CSS͕όϯυϧ ʹࠞೖ͢Δ • ಛʹϖʔδॳظදࣔͰɺ࠷ݶඞཁͳCSS͚ͩ ΛHTMLʹΠϯϥΠϯͰຒΊࠐΉΑ͏ͳߴԽ ࢪࡦͷಋೖ͕͘͠ͳΔ
• ϖʔδͷද͕ࣔ͘ͳΔ
άϩʔόϧωʔϜεϖʔε • CSSΛ࣮࣭తʹϩʔΧϧείʔϓԽ͢Δٕज़Λ ͑ͳ͍ • ϑϨʔϜϫʔΫඪ४ • CSS Modules •
ͦͷଞCSS in JS • ౷తͳCSSͷͭΒΈͱBEMͳͲͷख๏Ͱઓ Θͳ͚ΕͳΒͳ͍
ϙʔλϏϦςΟ͕Լ͕Δ • ίϯϙʔωϯτΛϓϩδΣΫτ֎Ͱ࠶ར༻͢ Δқ্͕͕Δ • ͦͷίϯϙʔωϯτ͕ґଘ͢ΔελΠϧΛ࠶ ར༻ઌͰ༻ҙͯ͋͛͠ͳ͚ΕͳΒͳ͍
ղܾࡦ
CSSΛίϯϙʔωϯτʹؚΊΔ άϩʔόϧ ίϯϙʔωϯτ X
ϝϦοτ • ίϯϙʔωϯτͱCSSͷґଘ͕ؔ໌֬ʹͳ Γɺcode splitting͕ՄೳʹͳΔ • ίϯϙʔωϯτʹดͨ͡ϩʔΧϧͳωʔϜε ϖʔε͕͑Δ • ϙʔλϏϦςΟ্͕͢Δ
Ξϯνύλʔϯ2
ίʔυDRYɺग़ྗඇDRY
CSS in JSΛ֮͑ͨͯͷࠒͷࢲ ώϟοϋʔʂJSͰclassΛ֦ுͰ͖Δʔ̇ const basicButton = { textAlign: 'center',
cursor: 'pointer', fontWeight: 700, // ... }; const redButton = { ...basicButton, backgroundColor: 'red' };
Ϗϧυޙͷίʔυͷ͜ͱΛ ߟ͍͑ͯͳ͔ͬͨ
ग़ྗ͞ΕΔCSS .basic-button { text-align: center; cursor: pointer; font-weight: 700; //
... } .red-button { text-align: center; cursor: pointer; font-weight: 700; background-color: red; // … }
ग़ྗ͞ΕΔCSS .basic-button { text-align: center; cursor: pointer; font-weight: 700; //
... } .red-button { text-align: center; cursor: pointer; font-weight: 700; background-color: red; // … } DRY͡Όͳ͍
ͪͳΈʹstyled components https://www.styled-components.com/docs/basics#extending-styles
ͪͳΈʹstyled components https://www.styled-components.com/docs/basics#extending-styles
ͪͳΈʹstyled components https://www.styled-components.com/docs/basics#extending-styles ʊਓਓਓਓਓਓਓਓਓਓਓʊ ʼɹDRY͡Όͳ͍ʂʂɹʻ ʉY^Y^Y^Y^Y^Y^Y^Y^Yʉ
ͻΐͬͱͯ͠ճආࡦ͕͋Δʁ styled componentsৄ͍͠ํ ڭ͍͑ͯͩ͘͞
ίʔυ͕DRYͰ ग़ྗ͕DRYͰͳ͍ͱݶΒͳ͍ ※SASSͷ@extendsɺCSS Modulesͷcomposesग़ྗDRYͰ͢
ղܾࡦ
൚༻తͳελΠϧΛෳͷ ίϯϙʔωϯτͰ͍ճ͍ͨ࣌͠ • ͦͷελΠϧͦͷͷΛίϯϙʔωϯτʹׅ Γͩ͠ɺίϯϙʔωϯτ୯ҐͰ͍ճ͢ • ίϯϙʔωϯτ୯ҐͰͷ͍ճ͠ͳΒɺಉ͡ Α͏ͳclass͕ॏෳͯ͠ग़ྗ͞ΕΔ͜ͱͳ͍ -> ΄ͱΜͲελΠϧ͚ͩͷখ͍͞ίϯϙʔωϯ
τ͕ͨ͘͞ΜͰ͖Δ
෦తʹελΠϧΛม͍͑ͨ࣌ • ίϯϙʔωϯτͷϓϩύςΟͰ੍ޚ͢Δ import { button, red } from './style.css';
function Button(props) { return ( <button className={classNames( button, { [red]: props.isRed } )}> {props.children} </button> ); }
෦తʹελΠϧΛม͍͑ͨ࣌ • ίϯϙʔωϯτͷϓϩύςΟͰ੍ޚ͢Δ import { button, red } from './style.css';
function Button(props) { return ( <button className={classNames( button, { [red]: props.isRed } )}> {props.children} </button> ); } ͜͜ʹ w ར༻ଆ͔ΒʮதʯΛͤΔ Α͏ʹ͢Δ w 8FC$PNQPOFOUT 7VFKT ͳΒTMPU w "OHVMBSͳΒOHDPOUFOU
• ίϯϙʔωϯτͷϓϩύςΟͰ੍ޚ͢Δ import { button, red } from './style.css'; function
Button(props) { return ( <button className={classNames( button, { [red]: props.isRed } )}> {props.text} </button> ); } ͜ΕΑ͘ͳ͍ ෦తʹελΠϧΛม͍͑ͨ࣌
ར༻ଆ͔Βݟͨ߹ // ྑ͍ྫ: ॊೈ <Book>Click Me!</Book> <Book><a href="...">Click Me!</a></Book> <Book><i
className="icon"></i>Click Me!</Book> // ѱ͍ྫ: ॊೈͰͳ͍ // ଟ༷ͳཁ݅ʹରԠ͠Α͏ͱ͢Δͱɺ // ίϯϙʔωϯτͷ࣮͕ͲΜͲΜෳࡶʹ <Book text="Click Me!"></Book> ͜ΕΞϯνύλʔϯ ˞$44ࣗମͷͷͰͳ͍͕
ͭ·Γ
ίϯϙʔωϯτϕʔεΛపఈ͢Δ -> ͍͍ίʔυ͕Ϗϧυ͞ΕΔ • CSSΛίϯϙʔωϯτʹؚΊΔ • ελΠϧͷ࠶ར༻ͷ୯ҐΛίϯϙʔωϯτʹ ͢Δ • slotΛͬͯॊೈੑΛ֬อ͢Δ
ॳΊෆ҆ͩͬͨ • ओͳݒ೦ • ίϯϙʔωϯτ୯ҐͰͷελΠϧͷ͍ճ͠ Ͱཻ͕ߥ͗ͯ͢ɺ݁ہclass୯Ґͷ͍ճ ͠ͷັྗʹ߅͑ͳ͍ͷͰʁ -> ࠓͷͱ͜Ζᐜ༕
Atomic Design?
͏·Έ͕Α͔͍ͬͯ͘ͳ͍ • ͏·͍ͷ͔͠Εͳ͍ • ͜ͷઌߦ͖٧·ͬͨΒऔΓೖΕΔ͔ • Atoms, Molecules, Organismsͷ͚͕۠͠ ͍ͱ͍͏ΛΑ͘ฉ͘
-> ࠓͷΓํɺϏϧυ݁Ռͱ͍͏࣮རϕʔε ͷઃܭͰ࣮֬ʹ͏·͘ɺ͔ͭͦͷ؍Ͱઃܭʹ ໎͏͜ͱ͕ࠓͷͱ͜Ζ͋·Γͳ͍
Thank you!