polen/build/template/server/transformers/inject-polen-data.js

A framework for delightful GraphQL developer portals

import { createHtmlTransformer } from '#lib/html-utils/html-transformer';
import { injectGlobalDataIntoHTML } from '#lib/html-utils/inject-global-data';
import * as Theme from '#lib/theme/theme';
/**
 * HTML transformer that injects Polen global data based on request context
 * This runs in both dev and production modes to ensure consistent behavior
 */
export const createPolenDataInjector = () => {
    return createHtmlTransformer((html, ctx) => {
        // Create theme manager to read cookies
        const themeManager = Theme.createThemeManager({
            cookieName: `polen-theme-preference`,
        });
        // Get theme from request cookies
        const cookies = ctx.req.header(`cookie`) || ``;
        const cookieTheme = themeManager.readCookie(cookies);
        // Use existing Polen global data if available, otherwise create new
        const polenData = globalThis.__POLEN__ || {
            serverContext: {
                theme: cookieTheme || 'system', // No cookie means system preference
                isDev: !__BUILDING__, // true in dev, false in production
            },
        };
        // Just inject the Polen data, no additional code
        return injectGlobalDataIntoHTML(html, '__POLEN__', polenData);
    });
};
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