one/dist/esm/vercel/build/generate/createSsrServerlessFunction.mjs

One is a new React Framework that makes Vite serve both native and web.

import fs from "fs-extra";
import { join, resolve } from "node:path";
import { serverlessVercelNodeJsConfig } from "../config/vc-config-base.mjs";
import { serverlessVercelPackageJson } from "../config/vc-package-base.mjs";
import { getPathFromRoute } from "../getPathFromRoute.mjs";
async function createSsrServerlessFunction(route, buildInfo, oneOptionsRoot, postBuildLogs) {
  try {
    const path = getPathFromRoute(route);
    postBuildLogs.push(`[one.build][vercel.createSsrServerlessFunction] path: ${path}`);
    const buildInfoAsString = JSON.stringify(buildInfo),
      funcFolder = resolve(join(oneOptionsRoot, `.vercel/output/functions/${path}.func`));
    await fs.ensureDir(funcFolder);
    const distServerFrom = resolve(join(oneOptionsRoot, "dist", "server")),
      distServerTo = resolve(join(funcFolder, "server"));
    await fs.ensureDir(distServerTo), postBuildLogs.push(`[one.build][vercel.createSsrServerlessFunction] copy server dist files from ${distServerFrom} to ${distServerTo}`), await fs.copy(distServerFrom, distServerTo), postBuildLogs.push("[one.build][vercel.createSsrServerlessFunction] writing buildInfo.json"), await fs.writeFile(join(funcFolder, "buildInfo.js"), `export default ${buildInfoAsString}`), await fs.ensureDir(join(funcFolder, "entrypoint"));
    const entrypointFilePath = resolve(join(funcFolder, "entrypoint", "index.js"));
    postBuildLogs.push(`[one.build][vercel.createSsrServerlessFunction] writing entrypoint to ${entrypointFilePath}`), await fs.writeFile(entrypointFilePath, `
  const buildInfoConfig = await import('../buildInfo.js');
  const entry = await import('../server/_virtual_one-entry.js');
  const routeFile = ${JSON.stringify(route.file)}

  const handler = async (req, res) => {
    // console.debug("req.url", req.url);
    const url = new URL(req.url, \`https://\${process.env.VERCEL_URL}\`);
    const loaderProps = {
      path: url.pathname,
      params: Object.fromEntries(url.searchParams.entries())
    }
    const postfix = url.pathname.endsWith('/') ? 'index.tsx' : '+ssr.tsx';
    // const routeFile = \`.\${url.pathname}\${postfix}\`;
    let route = buildInfoConfig.default.routeToBuildInfo[routeFile];

    // If we cannot find the route by direct match, try to find it by looking it up in the
    // pathToRoute mapping. Currently this handles cases such as "(some-group)/index.tsx",
    // "index.web.tsx".
    if (!route) {
      const routeName = buildInfoConfig.default.pathToRoute[url.pathname];
      route = buildInfoConfig.default.routeToBuildInfo[routeName];
    }

    const render = entry.default.render;
    const exported = await import(route.serverJsPath.replace('dist/','../'))
    const loaderData = await exported.loader?.(loaderProps)
    const preloads = route.preloads
    const rendered = await render({
      mode: route.type,
      loaderData,
      loaderProps,
      path: loaderProps?.path || '/',
      preloads,
    })
    res.setHeader('Content-Type', 'text/html; charset=utf-8')
    // https://vercel.com/docs/deployments/skew-protection#supported-frameworks__
    if (process.env.VERCEL_SKEW_PROTECTION_ENABLED === '1') {
      res.setHeader('Set-Cookie', [
        \`__vdpl=\${process.env.VERCEL_DEPLOYMENT_ID}; HttpOnly\`,
      ]);
    }
    res.end(rendered)
  }

  export default handler;
  `);
    const packageJsonFilePath = resolve(join(funcFolder, "package.json"));
    postBuildLogs.push(`[one.build][vercel.createSsrServerlessFunction] writing package.json to ${packageJsonFilePath}`), await fs.writeJSON(packageJsonFilePath, serverlessVercelPackageJson);
    const vcConfigFilePath = resolve(join(funcFolder, ".vc-config.json"));
    return postBuildLogs.push(`[one.build][vercel.createSsrServerlessFunction] writing .vc-config.json to ${vcConfigFilePath}`), fs.writeJson(vcConfigFilePath, {
      ...serverlessVercelNodeJsConfig,
      handler: "entrypoint/index.js",
      environment: {
        ...serverlessVercelNodeJsConfig.environment,
        ONE_DEFAULT_RENDER_MODE: "ssr"
      }
    });
  } catch (e) {
    console.error(`[one.build][vercel.createSsrServerlessFunction] failed to generate func for ${route.file}`, e);
  }
}
export { createSsrServerlessFunction };
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