Allow users to pass config to Vite

.changeset/pink-trainers-learn.md

@@ -0,0 +1,5 @@
+---
+'astro': minor
+---
+
+Use new compiler, move Astro to Vite

.github/workflows/ci.yml

@@ -22,7 +22,8 @@ jobs:
           - os: windows-latest
             node_version: 14
       fail-fast: false
-
+    env:
+      LANG: en-us
     name: 'Test: node-${{ matrix.node_version }}, ${{ matrix.os }}'
     steps:
       - name: Checkout

docs/src/pages/reference/configuration-reference.md

@@ -22,7 +22,3 @@ export default /** @type {import('astro').AstroUserConfig} */ (
   }
 );
 ```
-
-## Snowpack Config
-
-Astro is powered internally by Snowpack. You can configure Snowpack directly by creating a `snowpack.config.mjs` file. See [snowpack.dev](https://www.snowpack.dev/reference/configuration) for full documentation on this file.

packages/astro/src/@types/astro.ts

@@ -91,6 +91,8 @@ export interface AstroUserConfig {
      */
     trailingSlash?: 'always' | 'never' | 'ignore';
   };
+  /** Pass configuration options to Vite */
+  vite?: vite.InlineConfig;
 }
 
 // NOTE(fks): We choose to keep our hand-generated AstroUserConfig interface so that

packages/astro/src/build/index.ts

@@ -62,6 +62,7 @@ class AstroBuilder {
           hmr: { overlay: false },
           middlewareMode: 'ssr',
         },
+        ...(this.config.vite || {}),
       },
       { astroConfig: this.config, logging }
     );

packages/astro/src/config.ts

@@ -66,6 +66,7 @@ export const AstroConfigSchema = z.object({
     })
     .optional()
     .default({}),
+  vite: z.any().optional().default({}), // TODO: we don’t need validation, but can we get better type inference?
 });
 
 /** Turn raw config values into normalized values */

packages/astro/src/dev/index.ts

@@ -174,6 +174,7 @@ export class AstroDevServer {
           middlewareMode: 'ssr',
           host: this.hostname,
         },
+        ...(this.config.vite || {}),
       },
       { astroConfig: this.config, logging: this.logging, devServer: this }
     );

packages/astro/src/runtime/vite/config.ts

@@ -1,12 +1,11 @@
-import type { InlineConfig, Plugin } from 'vite';
 import type { AstroConfig } from '../../@types/astro';
 import type { LogOptions } from '../../logger';
 
 import fs from 'fs';
 import slash from 'slash';
-import deepmerge from 'deepmerge';
 import { fileURLToPath } from 'url';
 import { createRequire } from 'module';
+import vite from 'vite';
 import { getPackageJSON, parseNpmName } from '../util.js';
 import astro from './plugin-astro.js';
 import markdown from './plugin-markdown.js';
@@ -16,7 +15,7 @@ import { AstroDevServer } from '../../dev';
 const require = createRequire(import.meta.url);
 
 // note: ssr is still an experimental API hence the type omission
-type ViteConfigWithSSR = InlineConfig & { ssr?: { external?: string[]; noExternal?: string[] } };
+type ViteConfigWithSSR = vite.InlineConfig & { ssr?: { external?: string[]; noExternal?: string[] } };
 
 /** Return a common starting point for all Vite actions */
 export async function loadViteConfig(
@@ -70,7 +69,7 @@ export async function loadViteConfig(
     optimizedDeps.add(`astro/client/${hydrator}`); // always prepare these for client
   });
 
-  return deepmerge(
+  return vite.mergeConfig(
     {
       cacheDir: fileURLToPath(new URL('./node_modules/.vite/', astroConfig.projectRoot)), // using local caches allows Astro to be used in monorepos, etc.
       clearScreen: false,

packages/astro/src/runtime/vite/plugin-astro.ts

@@ -1,7 +1,6 @@
 import type { TransformResult } from '@astrojs/compiler';
 import type { Plugin } from 'vite';
 import type { AstroConfig, Renderer } from '../../@types/astro.js';
-import type { TransformResult } from '@astrojs/compiler';
 
 import esbuild from 'esbuild';
 import fs from 'fs';

packages/astro/test/astro-basic.test.js

@@ -87,10 +87,10 @@ describe('Astro basics', () => {
       const result = await fixture.fetch('/bad-url');
       expect(result.status).toBe(404);
     });
-
-    // important: close preview server (free up port and connection)
-    afterAll(async () => {
-      await previewServer.stop();
-    });
   });
 });
+
+// important: close preview server (free up port and connection)
+afterAll(async () => {
+  if (previewServer) await previewServer.stop();
+});