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server-side-rendering.js
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server-side-rendering.js
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import express from 'express';
import path from "path";
import React from 'react';
import { renderToString } from 'react-dom/server';
import { ServerStyleSheet } from 'styled-components'
export function addServerSideRendering(app, handlebarsEngine) {
const devEnv = app.get('env') === 'development';
const viewsDir = app.get('views');
// Serve the views directory so we can include the component's script on the page
app.use(express.static(viewsDir));
const ssrEngine = function (viewFile, options, callback) {
// Allow specifying the template by the name of the source file or the transpiled file
const viewFilePath = viewFile.replace(/\.jsx$/,'.js');
const relativeViewFilePath = path.join('/', path.relative(viewsDir, viewFilePath));
// The `build` script produces a nodejs-friendly and a browser-friendly version of the view.
const nodeViewPath = path.join(viewsDir, 'node', relativeViewFilePath);
const props = { ...options };
// The properties included in all template render calls include some potentially-sensitive data we don't want to
// expose in the serialised properties on the page, so leave those out.
for (const key of Object.keys(props._locals)) {
if (props[key] === props._locals[key]) {
delete props[key];
}
}
delete props._locals;
delete props.settings;
delete props.cache;
let sheet = null;
try {
const ssrOptions = {
body: '',
styleTags: ''
};
// Provide an option for skipping server-side rendering in case it causes issues or is simply not necessary.
if (!options.browserOnly) {
// Some atlaskit components use a css-in-js solution called "Styled Components" (though most have switched to Emotion).
// It requires some special handling when rendering on the server.
sheet = new ServerStyleSheet();
// Dynamically require the component file that was requested. Assume the root component is the default export.
// Ensure we pick up the latest version if we're running in dev mode.
if (devEnv) delete require.cache[nodeViewPath];
const rootElement = React.createElement(require(nodeViewPath).default, props);
ssrOptions.body = renderToString(sheet.collectStyles(rootElement));
ssrOptions.styleTags = sheet.getStyleTags();
}
const viewOptions = {
...options,
...ssrOptions,
// React is configured as an "external" so we can share a cached, CDN-delivered version between pages.
reactSource: `//unpkg.com/react@16/umd/react.${devEnv ? 'development' : 'production.min'}.js`,
reactDomSource: `//unpkg.com/react-dom@16/umd/react-dom.${devEnv ? 'development' : 'production.min'}.js`,
rootComponentSource: relativeViewFilePath,
// Supply props for rendering / hydration
props: JSON.stringify(props)
};
const layoutTemplate = path.join(viewsDir, 'react-layout.hbs');
return handlebarsEngine(
layoutTemplate,
viewOptions,
callback
);
} catch (e) {
if (e && e.code === 'MODULE_NOT_FOUND') {
return callback(new Error(`Could not load the component ${path.basename(viewFile)}. Did you run \`npm build\` to compile your jsx files?`));
}
return callback(e);
} finally {
sheet && sheet.seal();
}
};
app.engine('.js', ssrEngine);
app.engine('.jsx', ssrEngine);
}