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One free scan finds every outdated or missing driver and matches the right update for your exact hardware.Free scan · exact hardware matchTo use st-core.fscss with Svelte in compiled mode, write an FSCSS source file with the chart mixins, compile it to CSS during your app’s build, import that CSS, and have Svelte update the chart’s CSS custom properties as data changes. The chart’s number of points is fixed when the CSS is compiled, so choose a known series length or set a maximum and pad shorter inputs.
How compiled mode divides the work
st-core.fscss is a CSS chart and dashboard system built on FSCSS. Its chart shapes use clip-path: polygon(), with values supplied through CSS custom properties. In compiled mode, the FSCSS CLI expands the mixins into ordinary CSS before the app is delivered; Svelte then supplies changing values at runtime. The project describes this as avoiding the FSCSS browser runtime and a chart-layer remote request. Project README
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The integration tutorial describes compiled mode as the practical choice for a Svelte app that already has a build pipeline, while runtime loading can suit a quick static demo. The distinction is when compilation happens and whether the page relies on a runtime script; it is not a claim of independently measured performance. Svelte compiled-mode integration tutorial
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The polygon geometry is generated at compile time. Adding more --st-pN properties later does not create additional polygon stops, so decide how many points the chart must support before writing its FSCSS template.
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- If every series has the same known length, compile the template for that number of points and pass the same number of values.
- If series length varies up to a known maximum, compile for that maximum, trim longer input to the limit, and pad shorter input to the same length.
This fixed geometry is the main constraint to account for before wiring Svelte reactivity. Svelte compiled-mode integration tutorial
Create the FSCSS chart source
The tutorial’s example puts the entry file at src/styles/st-core.fscss. It imports the st-core mixins, calls @st-root(), defines a chart-data array as a compile-time shape template, and applies the chart-points, fill, and line mixins. Use a zero-filled array of the required length as the template; the live values will come from custom properties set by Svelte.
The exact import and mixin declarations depend on the project’s FSCSS and st-core setup. Refer to the package README for its current mixin names and usage: st-core.fscss project README.
Compile FSCSS as part of the Svelte build
Install FSCSS as a development dependency, then use its CLI to turn the .fscss entry file into a .css file. The integration tutorial recommends adding this compilation as a prebuild step so the generated stylesheet is refreshed during the normal application build. Its install example uses @latest; check the current package release and CLI syntax rather than assuming that example remains current. Svelte compiled-mode integration tutorial
- Add a compile script. Configure a package script to invoke the FSCSS CLI on
src/styles/st-core.fscssand write its output to a CSS file in the app’s source tree. - Run it before the app build. Add the compile script as a prebuild task so a production build does not use stale or missing generated CSS.
- Import the generated stylesheet. Import the CSS from a root layout, app-level stylesheet, or the chart component, depending on the app’s structure.
The CLI command and package-script details can vary with the FSCSS version, so use the syntax documented for the version installed in the project.
Connect Svelte data to CSS custom properties
Map each chart value to a numbered custom property such as --st-p0, --st-p1, and so on. Include chart height and accent color in the component’s inline style if the chart mixins expect those values. When the input series changes, recompute the style string; the compiled CSS remains in place, and the browser redraws the chart from the updated properties.
Svelte 4
The tutorial uses export let for component props and a reactive statement ($:) to rebuild the style string when its inputs change. This example is for Svelte 4’s component syntax; keep the point count consistent with the compiled template.
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export let values = [];
export let height = 120;
export let accent = "#4f46e5";
$: style = [
`--st-height: ${height}px`,
`--st-accent: ${accent}`,
...values.map((value, index) => `--st-p${index}: ${value}`)
].join(";");
</script>
<div class="chart" style={style}></div>Svelte 5
The tutorial’s Svelte 5 version uses $props() to read props and $derived() to compute the style string. Use this API when the component is written for Svelte 5 rather than mixing it with the Svelte 4 example’s prop and reactivity syntax.
<script>
let { values = [], height = 120, accent = "#4f46e5" } = $props();
let style = $derived([
`--st-height: ${height}px`,
`--st-accent: ${accent}`,
...values.map((value, index) => `--st-p${index}: ${value}`)
].join(";"));
</script>
<div class="chart" style={style}></div>These snippets illustrate the data-to-custom-property pattern described by the integration tutorial; adapt property names to the mixins and selectors in the project’s stylesheet. For current Svelte syntax and migration details, consult the official Svelte documentation.
Independent reader supportYour contribution helps us test, update, and keep practical guides available for everyone.Handle short and overlong series deliberately
For a maximum of N points, normalize the input to exactly N entries before building the inline style. Truncate values after the maximum and pad missing entries with a value appropriate to the chart’s scale, commonly zero. This does not change the compiled polygon; it ensures each generated stop has a corresponding runtime value.
const normalized = values.slice(0, maxPoints);
while (normalized.length < maxPoints) normalized.push(0);Choose a padding value that makes sense for the data rather than treating zero as universally correct. If the series needs more points than the compiled maximum, increase the FSCSS template and rebuild the CSS.
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What compiled mode does—and does not—change
Compilation removes the need for the FSCSS browser runtime according to the project documentation; it does not make chart data static. Svelte can continue to update custom properties reactively. The project README gives approximate size figures of roughly 0.5 KB for compiled st-core and roughly 10 KB minified for its runtime; those are maintainer estimates, not independently verified measurements. st-core.fscss project README
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