improve config

things/nest/src/utility/config.ts

@@ -6,6 +6,21 @@ export interface Config {
   port: number;
 }
 
+const defaultConfig: Config = {
+  host: '::',
+  port: 3000,
+};
+
 export async function loadConfig(): Promise<Config> {
-  return yaml.parse(await fs.promises.readFile('./config.yaml', 'utf-8'));
+  let readConfig: Partial<Config> = {};
+  try {
+    const configText = await fs.promises.readFile('./config.yaml', 'utf-8');
+    readConfig = yaml.parse(configText);
+  } catch (e) {
+    console.error(`Failed to read config: ${e.toString()}`);
+  }
+  return {
+    ...defaultConfig,
+    ...readConfig,
+  };
 }