[fix] allow passing certificates via config (#2622)

.changeset/hip-nails-taste.md

@@ -0,0 +1,5 @@
+---
+'@sveltejs/kit': patch
+---
+
+[fix] allow passing certificates via config

packages/kit/src/cli.js

@@ -104,11 +104,14 @@ prog
 				throw Error('Could not find server');
 			}
 			// we never start the server on a socket path, so address will be of type AddressInfo
-			const chosen_port = /** @type {import('net').AddressInfo} */ (
+			const address_info = /** @type {import('net').AddressInfo} */ (
 				watcher.vite.httpServer.address()
-			).port;
+			);
+
+			https = https || !!config.kit.vite().server?.https;
+			open = open || !!config.kit.vite().server?.open;
 
-			welcome({ port: chosen_port, host, https, open });
+			welcome({ port: address_info.port, host: address_info.address, https, open });
 		} catch (error) {
 			handle_error(error);
 		}

packages/kit/src/core/dev/index.js

@@ -119,7 +119,7 @@ class Watcher extends EventEmitter {
 		});
 
 		/** @type {[any, string[]]} */
-		let [merged_config, conflicts] = deep_merge(modified_vite_config, {
+		const [merged_config, conflicts] = deep_merge(modified_vite_config, {
 			configFile: false,
 			root: this.cwd,
 			resolve: {
@@ -153,13 +153,17 @@ class Watcher extends EventEmitter {
 
 		// optional config from command-line flags
 		// these should take precedence, but not print conflict warnings
-		[merged_config] = deep_merge(merged_config, {
-			server: {
-				host: this.host,
-				https: this.https,
-				port: this.port
-			}
-		});
+		if (this.host) {
+			merged_config.server.host = this.host;
+		}
+		// https is already enabled then do nothing. it could be an object and we
+		// don't want to overwrite with a boolean
+		if (this.https && !merged_config.server.https) {
+			merged_config.server.https = this.https;
+		}
+		if (this.port) {
+			merged_config.server.port = this.port;
+		}
 
 		this.vite = await vite.createServer(merged_config);
 		remove_html_middlewares(this.vite.middlewares);