svelte: Proxy /api requests to https://crates.io` (#12563)

... or other hosts defined via `API_HOST`

Author: Turbo87

svelte/package.json

@@ -5,6 +5,10 @@
   "type": "module",
   "scripts": {
     "dev": "vite dev",
+    "dev:docker": "API_HOST=http://backend:8888 vite dev",
+    "dev:live": "vite dev",
+    "dev:local": "API_HOST=http://127.0.0.1:8888 vite dev",
+    "dev:staging": "API_HOST=https://staging.crates.io vite dev",
     "build": "vite build",
     "preview": "vite preview",
     "prepare": "svelte-kit sync || echo ''",

svelte/vite.config.ts

@@ -3,9 +3,17 @@ import { sveltekit } from '@sveltejs/kit/vite';
 import { playwright } from '@vitest/browser-playwright';
 import { defineConfig } from 'vitest/config';
 
+const API_HOST = process.env.API_HOST ?? 'https://crates.io';
+
 export default defineConfig({
   plugins: [sveltekit(), svg()],
 
+  server: {
+    proxy: {
+      '/api': API_HOST,
+    },
+  },
+
   test: {
     expect: { requireAssertions: true },