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A utility-first CSS framework with a radically simpler configuration system. One flat preset file in, one CSS file out compiled by a single Rust binary. No JavaScript config, no extend merge magic, no plugin system for the 90% case. https://github.com/PresetCSS/PresetCSS
A utility-first CSS framework with a radically simpler configuration system.
One flat preset file in, one CSS file out compiled by a single Rust binary.
No JavaScript config, no extend merge magic, no plugin system for the 90% case.
# preset.toml - this is the whole config
[colors]
primary = "#3b82f6"
[breakpoints]
tablet = "768px"
/* generated */
.bg-primary { background-color: #3b82f6; }
.text-primary { color: #3b82f6; }
.border-primary { border-color: #3b82f6; }
@media (min-width:768px) { .tablet\:flex { display: flex; } }
cargo build --release # binary at target/release/presetcss
cargo install --path crates/presetcss-cli
| Command | What it does |
|---|---|
presetcss init | Write a commented preset.toml (a copy of the defaults). |
presetcss build [--minify] [--verbose] [-c file] [-o out.css] | Generate CSS. |
presetcss watch | Build, then rebuild on changes to the preset or content files. |
presetcss validate | Check the preset for typos, bad hex, key collisions - no output written. |
presetcss explain <class> | Show the CSS and preset provenance for one class. |
presetcss export --format json|js|css-vars | Export design tokens. |
presetcss help theme / help static | List token keys / built-in static utilities. |
[colors] is a flat key = "value" map. No nesting.[colors] replaces the default color group.[extend.colors] adds to it (your keys win). That is the only merge.[variants] - nothing is implicit.[utilities] takes raw CSS. Still no JavaScript.[extend.colors] # keep defaults, add one color
brand = "#ff0050"
[variants] # only colors get hover/focus; statics get breakpoints
colors = ["hover", "focus"]
static = ["responsive"]
[utilities]
btn = "padding: 0.5rem 1rem; border-radius: 6px; background: #3b82f6; color: white;"
breakpoint:state:utility - e.g. tablet:hover:bg-primary. Breakpoint names are
yours (from [breakpoints]), not a fixed sm/md/lg.
Set content = ["src/**/*.html"] in [options] and build emits only the
classes it finds in those files. Near-misses are reported instead of silently
dropped: 'bg-primry' looks like a PresetCSS class but is not generated - did you mean 'bg-primary'?
crates/presetcss-core/ # pure library: parse -> resolve -> [scan] -> generate -> emit
crates/presetcss-cli/ # the `presetcss` binary
examples/ # minimal + advanced presets
DESIGN.md # full design document
cargo test # core has a snapshot-style unit suite
cargo clippy --all-targets
GPL-3.0 © Seyyed Ali Mohammadiyeh (MAX BASE)
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PresetCSS /
A utility-first CSS framework with a radically simpler configuration system. One flat preset file in, one CSS file out compiled by a single Rust binary. No JavaScript config, no extend merge magic, no plugin system for the 90% case.