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TypeScript
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export type FontConfig = { id: string; displayName: string; fontFamily: string; fallback: string[]; baseSize?: number; // base font size in px for document content} & ( | { // Google Fonts loaded via CDN type: "google"; googleFontsFamily: string; // e.g., "Open+Sans:ital,wght@0,400;0,700;1,400;1,700" } | { // System fonts or fonts loaded elsewhere (e.g. next/font/local) type: "system"; });
export const fonts: Record<string, FontConfig> = { quattro: { id: "quattro", displayName: "iA Writer Quattro", fontFamily: "iA Writer Quattro V", baseSize: 16, type: "system", // Loaded via next/font/local in layout.tsx fallback: ["system-ui", "sans-serif"], }, lora: { id: "lora", displayName: "Lora", fontFamily: "Lora", baseSize: 17, type: "google", googleFontsFamily: "Lora:ital,wght@0,400..700;1,400..700", fallback: ["Georgia", "serif"], }, "atkinson-hyperlegible": { id: "atkinson-hyperlegible", displayName: "Atkinson Hyperlegible", fontFamily: "Atkinson Hyperlegible Next", baseSize: 18, type: "google", googleFontsFamily: "Atkinson+Hyperlegible+Next:ital,wght@0,200..800;1,200..800", fallback: ["system-ui", "sans-serif"], }, // Additional Google Fonts - Mono "sometype-mono": { id: "sometype-mono", displayName: "Sometype Mono", fontFamily: "Sometype Mono", baseSize: 17, type: "google", googleFontsFamily: "Sometype+Mono:ital,wght@0,400;0,700;1,400;1,700", fallback: ["monospace"], },
// Additional Google Fonts - Sans montserrat: { id: "montserrat", displayName: "Montserrat", fontFamily: "Montserrat", baseSize: 17, type: "google", googleFontsFamily: "Montserrat:ital,wght@0,400;0,700;1,400;1,700", fallback: ["system-ui", "sans-serif"], }, "source-sans": { id: "source-sans", displayName: "Source Sans 3", fontFamily: "Source Sans 3", baseSize: 18, type: "google", googleFontsFamily: "Source+Sans+3:ital,wght@0,400;0,700;1,400;1,700", fallback: ["system-ui", "sans-serif"], },};
export const defaultFontId = "quattro";export const defaultBaseSize = 16;
// Parse a Google Fonts URL or string to extract the font name and family parameter// Supports various formats:// - Full URL: https://fonts.googleapis.com/css2?family=Open+Sans:wght@400;700&display=swap// - Family param: Open+Sans:ital,wght@0,400;0,700// - Just font name: Open Sansexport function parseGoogleFontInput(input: string): { fontName: string; googleFontsFamily: string;} | null { const trimmed = input.trim(); if (!trimmed) return null;
// Try to parse as full URL try { const url = new URL(trimmed); const family = url.searchParams.get("family"); if (family) { // Extract font name from family param (before the colon if present) const fontName = family.split(":")[0].replace(/\+/g, " "); return { fontName, googleFontsFamily: family }; } } catch { // Not a valid URL, continue with other parsing }
// Check if it's a family parameter with weight/style specifiers (contains : or @) if (trimmed.includes(":") || trimmed.includes("@")) { const fontName = trimmed.split(":")[0].replace(/\+/g, " "); // Ensure plus signs are used for spaces in the family param const googleFontsFamily = trimmed.includes("+") ? trimmed : trimmed.replace(/ /g, "+"); return { fontName, googleFontsFamily }; }
// Treat as just a font name - construct a basic family param with common weights const fontName = trimmed.replace(/\+/g, " "); const googleFontsFamily = `${trimmed.replace(/ /g, "+")}:wght@400;700`; return { fontName, googleFontsFamily };}
// Custom font ID format: "custom:FontName:googleFontsFamily"export function createCustomFontId( fontName: string, googleFontsFamily: string,): string { return `custom:${fontName}:${googleFontsFamily}`;}
export function isCustomFontId(fontId: string): boolean { return fontId.startsWith("custom:");}
export function parseCustomFontId(fontId: string): { fontName: string; googleFontsFamily: string;} | null { if (!isCustomFontId(fontId)) return null; const parts = fontId.slice("custom:".length).split(":"); if (parts.length < 2) return null; const fontName = parts[0]; const googleFontsFamily = parts.slice(1).join(":"); return { fontName, googleFontsFamily };}
export function getFontConfig(fontId: string | undefined): FontConfig { if (!fontId) return fonts[defaultFontId];
// Check for custom font if (isCustomFontId(fontId)) { const parsed = parseCustomFontId(fontId); if (parsed) { return { id: fontId, displayName: parsed.fontName, fontFamily: parsed.fontName, type: "google", googleFontsFamily: parsed.googleFontsFamily, fallback: ["system-ui", "sans-serif"], }; } }
return fonts[fontId] || fonts[defaultFontId];}
// Get Google Fonts URL for a font// Using display=swap per Google's recommendation: shows fallback immediately, swaps when ready// This is better UX than blocking text rendering (display=block)export function getGoogleFontsUrl(font: FontConfig): string | null { if (font.type !== "google") return null; return `https://fonts.googleapis.com/css2?family=${font.googleFontsFamily}&display=swap`;}
// Get the base font size for a font configexport function getFontBaseSize(font: FontConfig): number { return font.baseSize ?? defaultBaseSize;}
// Get the CSS font-family value with fallbacksexport function getFontFamilyValue(font: FontConfig): string { const family = font.fontFamily.includes(" ") ? `'${font.fontFamily}'` : font.fontFamily; return [family, ...font.fallback].join(", ");}