feat: npm login check [#3]

Author: syi0808

src/registry/npm.ts

@@ -62,6 +62,20 @@ export class NpmRegistry extends Registry {
 		}
 	}
 
+	async isLoggedIn() {
+		try {
+			await this.npm(['whoami']);
+
+			return true;
+		} catch (error) {
+			if (`${error}`.includes('ENEEDAUTH')) {
+				return false;
+			}
+
+			throw new NpmError('Failed to run `npm whoami`', { cause: error });
+		}
+	}
+
 	async collaborators() {
 		try {
 			return JSON.parse(

src/tasks/npm.ts

@@ -22,6 +22,12 @@ export const npmAvailableCheckTasks: ListrTask<Ctx> = {
 	task: async () => {
 		const npm = await npmRegistry();
 
+		if (!(await npm.isLoggedIn())) {
+			throw new NpmAvailableError(
+				'You are not logged in. Please log in first using `npm login`.',
+			);
+		}
+
 		if (await npm.isPublished()) {
 			if (!(await npm.hasPermission())) {
 				throw new NpmAvailableError(