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react-server.js
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react-server.js
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import React from 'react';
import { renderToNodeStream } from 'react-dom/server';
import { StaticRouter } from 'react-router';
import { renderRoutes } from 'react-router-config';
import { HelmetProvider } from 'react-helmet-async';
import { ServerStyleSheet } from 'styled-components';
import { ApolloProvider, getDataFromTree } from 'react-apollo';
import reactTreeWalker from 'react-tree-walker';
import { ApolloClient } from 'apollo-client';
import {
InMemoryCache,
IntrospectionFragmentMatcher,
} from 'apollo-cache-inmemory';
import { ApolloLink, Observable } from 'apollo-link';
import { isServer, isProduction } from './index.js';
import { HttpLink } from 'apollo-link-http';
class EmptyResultLink extends ApolloLink {
request(operation, forward) {
return new Observable(observer => {
observer.next({ data: {} });
return () => {};
});
}
}
export default async ({ config, app }) => {
const {
createLink,
createFragmentTypes,
shouldPrefetch,
ssrMode,
outFile,
isPWA,
name,
version,
graphqlUrl,
} = config;
const containerElementName = `${name}-${version}`;
const fragmentTypesConfig = Object.assign({}, config, {
isServer,
isProduction,
});
const introspectionQueryResultData =
createFragmentTypes && (await createFragmentTypes(fragmentTypesConfig));
const cache = introspectionQueryResultData
? new InMemoryCache({
fragmentMatcher: new IntrospectionFragmentMatcher({
introspectionQueryResultData,
}),
})
: new InMemoryCache();
const apolloLinkConfig = Object.assign({}, config, {
cache,
isServer,
isProduction,
});
const link =
(createLink && (await createLink(apolloLinkConfig))) ||
(graphqlUrl && new HttpLink({ uri: graphqlUrl }));
const client = new ApolloClient({
ssrMode: isServer,
link: shouldPrefetch ? link : new EmptyResultLink(),
cache,
});
return async (request, res, next) => {
const helmetContext = {};
const routerContext = {};
const sheet = new ServerStyleSheet();
const componentConfig = Object.assign({}, config, {
request,
isServer,
isProduction,
});
const components = app && (await app(componentConfig));
const ServerApp = React.createElement(
HelmetProvider,
{ context: helmetContext },
React.createElement(
ApolloProvider,
{ client },
React.createElement(
StaticRouter,
{
location: request.url,
context: routerContext,
},
Array.isArray(components) ? renderRoutes(components) : components,
),
),
);
if (shouldPrefetch) await getDataFromTree(ServerApp);
else await reactTreeWalker(ServerApp, (element, instance) => ({}));
const { body, helmet, data = {} } = {
body: sheet.interleaveWithNodeStream(renderToNodeStream(ServerApp)),
helmet: helmetContext.helmet,
data: client.extract(),
};
res.setHeader('Content-Type', 'text/html');
res.write(
`<!doctype html>
<html ${helmet.htmlAttributes}>
<head>
${helmet.title}
${helmet.meta}
${helmet.link}
${helmet.noscript}
${helmet.script}
${helmet.style}
${ssrMode ? '' : `<script src="/${outFile}" defer></script>`}
${isPWA ? '<link rel="manifest" href="/manifest.webmanifest" />' : ''}
${
isPWA
? '<script>if ("serviceWorker" in navigator) window.addEventListener("load", function() { navigator.serviceWorker.register("/sw.js") });</script>'
: ''
}
</head>
<body ${helmet.bodyAttributes}>
<div id="${containerElementName || 'root'}">`,
);
body.pipe(
res,
{ end: false },
);
body.on('end', () => {
res.end(
`
</div>
${
!ssrMode && data && Object.keys(data).length > 0
? `<script>window.DATA=${JSON.stringify(data)};</script>`
: ''
}
</body>
</html>`,
);
next();
});
};
};