import { defineConfig } from 'vite'
import { svelte } from '@sveltejs/vite-plugin-svelte'

// The backend the dev server proxies to. 127.0.0.1 rather than localhost on
// purpose: Node resolves "localhost" to ::1 first, and the Go server binds
// IPv4, so the proxy would fail before falling back.
const apiTarget = process.env.VELLUM_API ?? 'http://127.0.0.1:7788'

// The bundle is embedded into the Go binary and served from /, so all asset
// paths must be relative (base: './').
export default defineConfig({
  plugins: [svelte()],
  base: './',
  build: {
    outDir: 'dist',
    emptyOutDir: true,
    target: 'es2020',
  },
  server: {
    port: 5173,
    // Listen on both stacks so a browser using either localhost works.
    host: true,
    proxy: {
      '/api': apiTarget,
      '/healthz': apiTarget,
    },
  },
})