japgolly/scalacss

Compile-time CSS generation

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#88 opened on Jun 17, 2016

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 (9 comments) (6 reactions) (0 assignees)Scala (41 forks)github user discovery
enhancementhelp wanted

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Description

It would be fantastic to generate CSS at compile-time instead of runtime, mainly because it would reduce the output JS size to near zero, making #72 obsolete.

Example:

val abc = style(display.block)
// Macro turns ↑ into something like ↓
val abc = StyleA(…, PreGeneratedCss("display:block"))

It would have to handle autoprefixing too.

How/could it determine whether variables are static/dynamic to handle marginLeft(zzz.px * 2)?

Even if it just takes care of the easy, static cases, I wonder how large the JS size savings could be...

Contributor guide

Research direction
Explore Scala macro features (e.g., whitebox macros) to evaluate static CSS at compile time. Study how to differentiate static vs dynamic values using tree inspection. Research autoprefixing libraries or data to embed.
Tech stack
scala
Domain
frontend
Issue type
Feature
DifficultyEstimated implementation difficulty for a new contributor, from 1 for very small changes to 5 for expert-level work.
4
Estimated timeA rough time range for an experienced contributor to investigate, implement, test, and prepare a pull request.
Over 1 week
Activity statusHow available the issue appears right now: fresh, active, stale, blocked, or waiting on maintainer input.
Active
ClarityHow clearly the issue explains the expected change, acceptance criteria, and next step.
Clear
Prerequisites
ScalaScala macrosCSS
Newbie friendlinessA 1-100 score estimating how approachable this issue is for first-time contributors.
25