Improve API definitions

src/server/api/endpoints/following/delete.ts

@@ -3,8 +3,11 @@ const ms = require('ms');
 import User, { pack, ILocalUser } from '../../../../models/user';
 import Following from '../../../../models/following';
 import deleteFollowing from '../../../../services/following/delete';
+import getParams from '../../get-params';
 
 export const meta = {
+	stability: 'stable',
+
 	desc: {
 		'ja-JP': '指定したユーザーのフォローを解除します。',
 		'en-US': 'Unfollow a user.'
@@ -17,24 +20,32 @@ export const meta = {
 
 	requireCredential: true,
 
-	kind: 'following-write'
+	kind: 'following-write',
+
+	params: {
+		userId: $.type(ID).note({
+			desc: {
+				'ja-JP': '対象のユーザーのID',
+				'en-US': 'Target user ID'
+			}
+		})
+	}
 };
 
 export default (params: any, user: ILocalUser) => new Promise(async (res, rej) => {
+	const [ps, psErr] = getParams(meta, params);
+	if (psErr) return rej(psErr);
+
 	const follower = user;
 
-	// Get 'userId' parameter
-	const [userId, userIdErr] = $.type(ID).get(params.userId);
-	if (userIdErr) return rej('invalid userId param');
-
 	// Check if the followee is yourself
-	if (user._id.equals(userId)) {
+	if (user._id.equals(ps.userId)) {
 		return rej('followee is yourself');
 	}
 
 	// Get followee
 	const followee = await User.findOne({
-		_id: userId
+		_id: ps.userId
 	}, {
 		fields: {
 			data: false,