How to Integrate st-core.fscss CSS Charts into a Svelte App at Build Time

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The st-core.fscss library renders charts using pure CSS clip-path polygons and custom properties, requiring no JavaScript chart library, SVG, or canvas. Integrating it into a Svelte or SvelteKit project involves compiling the FSCSS source file into static CSS once at build time using the FSCSS CLI, rather than loading a runtime CDN script on every page load. Svelte's role is limited to reactively mapping data values to CSS custom properties such as --st-p1 and --st-p2, while the browser handles rendering via the compiled CSS. A key constraint is that the array length defined in the FSCSS template must match the number of data points, as it determines the polygon geometry and cannot be changed without recompiling. The article provides component examples for both Svelte 4 and Svelte 5, along with package.json scripts to automate compilation before each build.

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ProgrammingDEV Community ·

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ProgrammingDEV Community ·

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