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a tool for shared writing and social publishing
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TSX
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export type EmailTheme = { primary: string; pageBackground: string; backgroundColor: string; accentBackground: string; accentText: string; headingFont: string; bodyFont: string; // Matches the publication's web `pageWidth` (px) so subscribers see the // post at the same column width in their inbox as on the live page. // Default 624 mirrors `ThemeProvider.tsx`'s fallback. pageWidth: number;};
export const defaultEmailTheme: EmailTheme = { primary: "rgb(39, 39, 39)", pageBackground: "rgb(255, 255, 255)", backgroundColor: "rgb(240, 247, 250)", accentBackground: "rgb(0, 0, 225)", accentText: "rgb(255, 255, 255)", headingFont: "Georgia, serif", bodyFont: "Verdana, sans-serif", pageWidth: 624,};
// Parse rgb()/rgba()/#hex into [r, g, b]. Returns black on parse failure —// theme colors come from a typed config so this is just defensive.const parseColor = (input: string): [number, number, number] => { const rgbMatch = input.match( /rgba?\(\s*(\d+)[\s,]+(\d+)[\s,]+(\d+)/i, ); if (rgbMatch) return [ Number(rgbMatch[1]), Number(rgbMatch[2]), Number(rgbMatch[3]), ]; const hexMatch = input.match(/^#([0-9a-f]{6})$/i); if (hexMatch) { const h = hexMatch[1]; return [ parseInt(h.slice(0, 2), 16), parseInt(h.slice(2, 4), 16), parseInt(h.slice(4, 6), 16), ]; } const hex3 = input.match(/^#([0-9a-f]{3})$/i); if (hex3) { const h = hex3[1]; return [ parseInt(h[0] + h[0], 16), parseInt(h[1] + h[1], 16), parseInt(h[2] + h[2], 16), ]; } return [0, 0, 0];};
// Linear sRGB mix of two colors. We resolve theme tints to literal rgb() at// render time because Gmail's CSS sanitizer drops `color-mix(...)` —// leaving borders invisible and tinted text falling back to defaults.// Linear mixing isn't perceptually identical to the oklab original, but// for the near-grayscale tints we use it's visually indistinguishable.export const mixRgb = ( a: string, b: string, bPercent: number,): string => { const [ar, ag, ab] = parseColor(a); const [br, bg, bb] = parseColor(b); const t = bPercent / 100; const round = (x: number) => Math.round(x); return `rgb(${round(ar * (1 - t) + br * t)}, ${round( ag * (1 - t) + bg * t, )}, ${round(ab * (1 - t) + bb * t)})`;};
export type ResolvedColors = { primary: string; secondary: string; tertiary: string; border: string; borderLight: string;};
export const resolveColors = (theme: EmailTheme): ResolvedColors => ({ primary: theme.primary, secondary: mixRgb(theme.primary, theme.pageBackground, 25), tertiary: mixRgb(theme.primary, theme.pageBackground, 55), border: mixRgb(theme.primary, theme.pageBackground, 75), borderLight: mixRgb(theme.primary, theme.pageBackground, 85),});
// Postmark fetches `<img src>` and link `href` values verbatim from the// rendered HTML — relative paths break. Templates accept an `assetsBaseUrl`// prop and use this builder for `/email-assets/*` references.export const makeStaticUrl = (assetsBaseUrl: string) => { const base = assetsBaseUrl.replace(/\/$/, ""); return (filename: string): string => `${base}/email-assets/${filename}`;};
// React's TypeScript types don't include the deprecated `bgcolor` HTML// attribute on <td>, but every email client (especially Outlook) reads it// directly — so we spread it via a typed cast. Combined with an inline// background-color style for clients that do honor CSS, this is the// belt-and-suspenders pattern for reliable email backgrounds.export const bgcolorAttr = (color: string): Record<string, string> => ({ bgcolor: color,});
// Tailwind config shared by the Leaflet/publication confirm emails.// All `color-mix(in oklab, ...)` expressions are pre-resolved to plain// rgb() because Gmail's CSS sanitizer drops `color-mix()` — leaving// classes like `text-secondary` and `border-border` rendering with no// color in Gmail.const CONFIRM_PRIMARY = "rgb(39, 39, 39)";const CONFIRM_PAGE_BG = "rgb(255, 255, 255)";
export const confirmEmailTailwindConfig = { presets: [pixelBasedPreset], theme: { screens: { sm: "640px", md: "960px", lg: "1280px", }, borderRadius: { none: "0", md: "0.25rem", lg: "0.5rem", full: "9999px", }, colors: { inherit: "inherit", transparent: "transparent", current: "currentColor", primary: CONFIRM_PRIMARY, secondary: mixRgb(CONFIRM_PRIMARY, CONFIRM_PAGE_BG, 25), tertiary: mixRgb(CONFIRM_PRIMARY, CONFIRM_PAGE_BG, 55), border: mixRgb(CONFIRM_PRIMARY, CONFIRM_PAGE_BG, 75), "border-light": mixRgb(CONFIRM_PRIMARY, CONFIRM_PAGE_BG, 85), white: "#FFFFFF", "accent-1": "rgb(0, 0, 225)", "accent-2": "rgb(255, 255, 255)", "accent-contrast": "rgb(0, 0, 225)", "bg-leaflet": "rgb(240, 247, 250)", "bg-page": "rgba(255, 255, 255, 1)", "highlight-1": "rgb(255, 177, 177)", "highlight-2": "rgb(253, 245, 203)", "highlight-3": "rgb(255, 205, 195)", }, fontSize: { xs: ".75rem", sm: ".875rem", base: "1rem", lg: "1.125rem", xl: "1.625rem", "2xl": "2rem", }, extend: { fontFamily: { sans: ["Verdana"], serif: ["Georgia"], }, }, },};
// Wraps `<Head>` with the viewport meta that prevents iOS Mail / Gmail iOS// from auto-shrinking the email to fit a wider-than-viewport layout (which// makes every element render visually small). Templates can pass extra// children — usually a `<style>` block with template-specific @media// rules — and they'll be appended after the meta.export const MailHead = ({ children,}: { children?: React.ReactNode;}) => ( <Head> <meta name="viewport" content="width=device-width, initial-scale=1.0" /> {children} </Head>);
export const LeafletWatermark = ({ staticUrl, theme = defaultEmailTheme,}: { staticUrl?: (filename: string) => string; theme?: EmailTheme;} = {}) => { const c = resolveColors(theme); // Mail clients fetch <img src> verbatim, so the fallback must be absolute. const leafletSrc = staticUrl ? staticUrl("leaflet.png") : "https://leaflet.pub/email-assets/leaflet.png"; // Shrink-to-fit table with align="center" — the bulletproof email // pattern for centering a chunk of inline content within whatever // container it lands in (works inside both <td align="center"> in the // post template and a bare Body in the confirm emails). return ( <table role="presentation" align="center" cellPadding={0} cellSpacing={0} border={0} > <tbody> <tr> <td> <Link href="https://leaflet.pub" style={{ color: c.tertiary, fontFamily: theme.bodyFont, fontSize: 14, fontStyle: "italic", textDecoration: "none", }} > <Img src={leafletSrc} width={16} height={16} alt="" style={{ display: "inline-block", marginRight: 4, verticalAlign: "middle", }} /> <span style={{ verticalAlign: "middle" }}> Published with{" "} <span style={{ color: theme.accentBackground, fontWeight: "bold", }} > Leaflet </span> </span> </Link> </td> </tr> </tbody> </table> );};