Node.js standalone mode + support for astro preview (#5056)

* wip

* Deprecate buildConfig and move to config.build

* Implement the standalone server

* Stay backwards compat

* Add changesets

* correctly merge URLs

* Get config earlier

* update node tests

* Return the preview server

* update remaining tests

* swap usage and config ordering

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

Co-authored-by: Sarah Rainsberger <sarah@rainsberger.ca>

* Update .changeset/metal-pumas-walk.md

Co-authored-by: Sarah Rainsberger <sarah@rainsberger.ca>

* Update .changeset/metal-pumas-walk.md

Co-authored-by: Sarah Rainsberger <sarah@rainsberger.ca>

* Update .changeset/stupid-points-refuse.md

Co-authored-by: Sarah Rainsberger <sarah@rainsberger.ca>

* Update .changeset/stupid-points-refuse.md

Co-authored-by: Sarah Rainsberger <sarah@rainsberger.ca>

* Link to build.server config

Co-authored-by: Fred K. Schott <fkschott@gmail.com>
Co-authored-by: Sarah Rainsberger <sarah@rainsberger.ca>

1 files changed, 27 insertions, 3 deletions

diff --git a/packages/integrations/node/src/index.ts b/packages/integrations/node/src/index.ts
index 53b94b916..80dfacdab 100644
--- a/packages/integrations/node/src/index.ts
+++ b/packages/integrations/node/src/index.ts
@@ -1,24 +1,48 @@
 import type { AstroAdapter, AstroIntegration } from 'astro';
+import type { Options, UserOptions } from './types';
 
-export function getAdapter(): AstroAdapter {
+export function getAdapter(options: Options): AstroAdapter {
 	return {
 		name: '@astrojs/node',
 		serverEntrypoint: '@astrojs/node/server.js',
+		previewEntrypoint: '@astrojs/node/preview.js',
 		exports: ['handler'],
+		args: options
 	};
 }
 
-export default function createIntegration(): AstroIntegration {
+export default function createIntegration(userOptions: UserOptions): AstroIntegration {
+	if(!userOptions?.mode) {
+		throw new Error(`[@astrojs/node] Setting the 'mode' option is required.`)
+	}
+
+	let needsBuildConfig = false;
+	let _options: Options;
 	return {
 		name: '@astrojs/node',
 		hooks: {
 			'astro:config:done': ({ setAdapter, config }) => {
-				setAdapter(getAdapter());
+				needsBuildConfig = !config.build?.server;
+				_options = {
+					...userOptions,
+					client: config.build.client?.toString(),
+					server: config.build.server?.toString(),
+					host: config.server.host,
+					port: config.server.port,
+				};
+				setAdapter(getAdapter(_options));
 
 				if (config.output === 'static') {
 					console.warn(`[@astrojs/node] \`output: "server"\` is required to use this adapter.`);
 				}
 			},
+			'astro:build:start': ({ buildConfig }) => {
+				// Backwards compat
+				if(needsBuildConfig) {
+					_options.client = buildConfig.client.toString();
+					_options.server = buildConfig.server.toString();
+				}
+			}
 		},
 	};
 }