refactor: add isAppExtensionType guard and APP_EXTENSION_TYPES const

Author: dmitriyeff

src/cli.ts

@@ -9,6 +9,7 @@ import { nodeGenerator } from './generators/node/index.js';
 import { addOAuth } from './subcommands/addOAuth.js';
 import { addAppExtension } from './subcommands/addAppExtension.js';
 import type { AppExtensionType } from './generators/interface.js';
+import { isAppExtensionType } from './generators/interface.js';
 
 interface NextStepOptions {
 	nameOrPath: string;
@@ -59,8 +60,9 @@ export async function dispatchSubcommand(argv: string[]): Promise<boolean> {
 
 	if (subcommand === 'add-app-extension') {
 		const appExtIdx = argv.indexOf('--app-extensions');
-		const appExtensions =
-			appExtIdx !== -1 ? ([argv[appExtIdx + 1]] as AppExtensionType[]) : undefined;
+		const appExtValue = appExtIdx !== -1 ? argv[appExtIdx + 1] : undefined;
+		const appExtensions: AppExtensionType[] | undefined =
+			appExtValue !== undefined && isAppExtensionType(appExtValue) ? [appExtValue] : undefined;
 		await addAppExtension(outputDir, appExtensions);
 		return true;
 	}

src/generators/interface.ts

@@ -1,5 +1,11 @@
 export type Database = 'postgres' | 'mysql' | 'sqlite';
-export type AppExtensionType = 'custom-panel' | 'custom-modal';
+
+export const APP_EXTENSION_TYPES = ['custom-panel', 'custom-modal'] as const;
+export type AppExtensionType = (typeof APP_EXTENSION_TYPES)[number];
+
+export function isAppExtensionType(value: string): value is AppExtensionType {
+	return (APP_EXTENSION_TYPES as readonly string[]).includes(value);
+}
 
 export interface GeneratorOptions {
 	projectName: string;