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a tool for shared writing and social publishing
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TSX
123456789101112131415161718192021222324252627282930313233343536373839404142434445464748495051525354555657585960616263646566676869707172737475767778798081828384858687888990919293949596979899100101102103104105106// Server-side font loading component// Following Google's best practices: https://web.dev/articles/font-best-practices// - Preconnect to font origins for early connection// - Use font-display: swap (shows fallback immediately, swaps when ready)// - Don't block rendering - some FOUT is acceptable and better UX than invisible text
import { getFontConfig, getGoogleFontsUrl, getFontFamilyValue, getFontBaseSize, defaultFontId,} from "src/fonts";
type FontLoaderProps = { headingFontId: string | undefined; bodyFontId: string | undefined;};
export function FontLoader({ headingFontId, bodyFontId }: FontLoaderProps) { const headingFont = getFontConfig(headingFontId); const bodyFont = getFontConfig(bodyFontId);
// Don't load the default font (Quattro) here — it's already loaded via // next/font/local in layout.tsx under --font-quattro. Loading it again with // a different family name ('iA Writer Quattro V') causes issues when the // @font-face from this component isn't available (e.g., client-side navigation). const isDefaultHeading = headingFont.id === defaultFontId; const isDefaultBody = bodyFont.id === defaultFontId;
// Collect Google Fonts URLs (deduplicated) const fontsToLoad = [headingFont, bodyFont].filter( (f, i, arr) => f.id !== defaultFontId && arr.findIndex((o) => o.id === f.id) === i ); const googleFontsUrls = [...new Set( fontsToLoad .map((font) => getGoogleFontsUrl(font)) .filter((url): url is string => url !== null) )];
const headingFontValue = isDefaultHeading ? (isDefaultBody ? null : "var(--font-quattro)") : getFontFamilyValue(headingFont); const bodyFontValue = isDefaultBody ? (isDefaultHeading ? null : "var(--font-quattro)") : getFontFamilyValue(bodyFont); const bodyFontBaseSize = isDefaultBody ? null : getFontBaseSize(bodyFont);
// Set font CSS variables scoped to .leafletWrapper so they don't affect app UI // Don't set variables for the default font — let CSS fallback to var(--font-quattro) const fontVariableLines = [ headingFontValue && ` --theme-heading-font: ${headingFontValue};`, bodyFontValue && ` --theme-font: ${bodyFontValue};`, bodyFontBaseSize && ` --theme-font-base-size: ${bodyFontBaseSize}px;`, ].filter(Boolean);
const fontVariableCSS = fontVariableLines.length > 0 ? `.leafletWrapper {\n${fontVariableLines.join("\n")}\n}` : "";
return ( <> {/* Google Fonts best practice: preconnect to both origins - fonts.googleapis.com serves the CSS - fonts.gstatic.com serves the font files (needs crossorigin for CORS) Place these as early as possible in <head> */} {googleFontsUrls.length > 0 && ( <> <link rel="preconnect" href="https://fonts.googleapis.com" /> <link rel="preconnect" href="https://fonts.gstatic.com" crossOrigin="anonymous" /> {googleFontsUrls.map((url) => ( <link key={url} rel="stylesheet" href={url} /> ))} </> )} {/* CSS variables scoped to .leafletWrapper for SSR (before client hydration) */} {fontVariableCSS && ( <style dangerouslySetInnerHTML={{ __html: fontVariableCSS, }} /> )} </> );}
// Helper to extract fonts from facts array (for server-side use)export function extractFontsFromFacts( facts: Array<{ entity: string; attribute: string; data: { value: string } | Record<string, unknown> }>, rootEntity: string): { headingFontId: string | undefined; bodyFontId: string | undefined } { const headingFontFact = facts.find( (f) => f.entity === rootEntity && f.attribute === "theme/heading-font" ); const bodyFontFact = facts.find( (f) => f.entity === rootEntity && f.attribute === "theme/body-font" ); return { headingFontId: headingFontFact?.data?.value as string | undefined, bodyFontId: bodyFontFact?.data?.value as string | undefined, };}