A simple example project with integrating Postgraphile to SvelteKit - GitHub - gevera/sveltekit_postgraphile: A simple example project with integrating Postgraphile to SvelteKit

решил так:

svelte.config.js
config.kit.vite.server.proxy = {  '/api': API_HOST } // for dev
adapter: node({ entryPoint: './src/server.js' }) // for build
server.js
import dotenv from 'dotenv';
dotenv.config();

import { assetsMiddleware, prerenderedMiddleware, kitMiddleware } from '../build/middlewares.js';
import express from 'express';
import { createProxyMiddleware } from 'http-proxy-middleware';

const PORT = process.env["PORT"];
const API_HOST = process.env["API_HOST"];

const app = express();
app.use('/api', createProxyMiddleware({ target: API_HOST, changeOrigin: true }));
app.all('*', assetsMiddleware, prerenderedMiddleware, kitMiddleware);
app.listen(PORT, '0.0.0.0');

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