server.js

import { createRequestHandler } from '@remix-run/netlify';
import * as build from '@remix-run/dev/server-build';

function getLoadContext(event, context) {
    let rawAuthorizationString;
    let netlifyGraphToken;

    if (event.authlifyToken !== null) {
        netlifyGraphToken = event.authlifyToken;
    }

    let authHeader = event.headers['authorization'];
    let graphSignatureHeader = event.headers['x-netlify-graph-signature'];

    if (authHeader !== null && /Bearer /gi.test(authHeader)) {
        rawAuthorizationString = authHeader.split(' ')[1];
    }

    let loadContext = {
        clientNetlifyGraphAccessToken: rawAuthorizationString,
        netlifyGraphToken: netlifyGraphToken,
        netlifyGraphSignature: graphSignatureHeader,
    };

    // Remove keys with undefined values
    Object.keys(loadContext).forEach((key) => {
        if (loadContext[key] == null) {
            delete loadContext[key];
        }
    });

    return loadContext;
}

export const handler = createRequestHandler({
    build,
    getLoadContext,
    mode: process.env.NODE_ENV,
});