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next.js/examples/with-relay-modern/lib/createRelayEnvironment.js

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import { Environment, Network, RecordSource, Store } from 'relay-runtime'
import fetch from 'isomorphic-unfetch'
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let relayEnvironment = null
// Define a function that fetches the results of an operation (query/mutation/etc)
// and returns its results as a Promise:
function fetchQuery (operation, variables, cacheConfig, uploadables) {
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return fetch(process.env.RELAY_ENDPOINT, {
method: 'POST',
headers: {
Accept: 'application/json',
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'Content-Type': 'application/json'
}, // Add authentication and other headers here
body: JSON.stringify({
query: operation.text, // GraphQL text from input
variables
})
}).then(response => response.json())
}
export default function initEnvironment ({ records = {} } = {}) {
// Create a network layer from the fetch function
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const network = Network.create(fetchQuery)
const store = new Store(new RecordSource(records))
// Make sure to create a new Relay environment for every server-side request so that data
// isn't shared between connections (which would be bad)
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if (!process.browser) {
return new Environment({
network,
store
})
}
// reuse Relay environment on client-side
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if (!relayEnvironment) {
relayEnvironment = new Environment({
network,
store
})
}
return relayEnvironment
}