'use strict'; // Server-side render Hydrogen to a string. // // We use a `child_process` because we want to be able to exit the process after // we receive the SSR results. We don't want Hydrogen to keep running after we // get our initial rendered HTML. const assert = require('assert'); const RethrownError = require('../lib/rethrown-error'); const runInChildProcess = require('../child-process-runner/run-in-child-process'); const resolvedRenderHydrogenToStringUnsafeScriptPath = require.resolve( './render-hydrogen-to-string-unsafe' ); // The render should be fast. If it's taking more than 5 seconds, something has // gone really wrong. const RENDER_TIMEOUT = 5000; async function renderHydrogenToString(renderOptions) { assert(renderOptions); // We expect `config` but we should sanity check that we aren't leaking the access token // to the client if someone naievely copied the whole `config` object to here. assert(renderOptions.vmRenderContext.config); assert( !renderOptions.vmRenderContext.config.matrixAccessToken, 'We should not be leaking the `config.matrixAccessToken` to the Hydrogen render function because this will reach the client!' ); try { // In development, if you're running into a hard to track down error with // the render hydrogen stack and fighting against the multiple layers of // complexity with `child_process `and `vm`; you can get away with removing // the `child_process` part of it by using // `render-hydrogen-to-string-unsafe` directly. // ```js // const _renderHydrogenToStringUnsafe = require('../hydrogen-render/render-hydrogen-to-string-unsafe'); // const hydrogenHtmlOutput = await _renderHydrogenToStringUnsafe(renderOptions); // ``` // // We use a child_process because we want to be able to exit the process after // we receive the SSR results. We don't want Hydrogen to keep running after we // get our initial rendered HTML. const hydrogenHtmlOutput = await runInChildProcess( resolvedRenderHydrogenToStringUnsafeScriptPath, renderOptions, { timeout: RENDER_TIMEOUT, } ); return hydrogenHtmlOutput; } catch (err) { throw new RethrownError( `Failed to render Hydrogen to string. In order to reproduce, feed in these arguments into \`renderHydrogenToString(...)\`:\n renderHydrogenToString arguments: ${JSON.stringify( renderOptions )}`, err ); } } module.exports = renderHydrogenToString;