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berlin amsterdam los angeles san francisco singapore
edenspiekermann_
Local styling
with CSS Modules
@HugoGiraudel
20 May 2016
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@HugoGiraudel
Front-end developer
Edenspiekermann
Berlin, Germany
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Another CSS
in JS thing?
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Not about
making CSS
dependant on JS
in the browser
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About crafting
a CSS pipeline
(in JavaScript)
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“CSS in JS”
could as well be
“CSS in Ruby”
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We had CSS in
Ruby for years
with Sass
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“CSS in JS”
is reasonable
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CSS from JS
in the browser
would suck
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CSS Modules
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Glen Maddern
Mark Dalgleish
Tobias Koppers
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JS-powered
CSS pipeline
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Webpack
Browserify
JSPM
& moar…!
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Fixing (most)
CSS flaws
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No content
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“CSS isn’t broken”
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Hahaha.
Haha.
Ha.
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Global
namespace
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Dependency
management
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Dead code
elimination
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Configuration
sharing
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Well specified
but incomplete
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Fine!
What is it?
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A system where
everything is
local
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No more
global
namespace
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Not about
syntax
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Consider a
title
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No filename
repetition
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Not inline
styles
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Still classes
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Configurable
output
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css-loader
?modules
&localIdentName=
[name]__[local]
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Composition
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Good ol’
button
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Okay, Sass
first
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Now, CSS
Modules
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Not like
@extend
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No selector
merge
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Not like
@mixin
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No style
duplication
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Just class
composition
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Dependency
management
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Again,
composes
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Explicit
dependencies
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Sharing
styles
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COMPOSE ALL
THE THINGS!
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Global
classes?
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:global
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Shared
values?
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@value
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No content
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Basically
(local)
variables
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Explicit
dependencies
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Can be
renamed
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But, but, but…
BEM?
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Helps with
global
namespace
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Brain power,
consistency,
strictness…
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Not needed
anymore!
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But, but, but…
Webpack?
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postcss-
modules
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Statically
compiled
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No content
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But, but, but…
atomic CSS?
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Perfect
candidate
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Compose from
the stylesheet
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Have markup
updated
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But, but, but…
Sass?
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Not mutually
exclusive
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Sass makes
CSS easier to
write
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CSS Modules
make CSS easier
to maintain
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Why not both?
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Let’s sum up
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JS-powered
CSS pipeline
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Everything
is local
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Global
namespace no
more
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Pluggable in
any pipeline
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Pretty rad
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berlin amsterdam los angeles san francisco singapore
edenspiekermann_
Thank you!
@HugoGiraudel
20 May 2016