diff --git a/node/src/client.js b/node/src/client.js
index bc28579..92ff962 100644
--- a/node/src/client.js
+++ b/node/src/client.js
@@ -34,6 +34,12 @@ const { KnownChatType } = chat
 
 import { emitLines, promisify } from "./util.js"
 
+/**
+ * @typedef {Object} ChannelProps
+ * @property {Long} id
+ * @property {ChannelType} type
+ */
+
 
 ServiceApiClient.prototype.requestFriendList = async function() {
 	const res = await this._client.requestData(
@@ -132,24 +138,22 @@ class UserClient {
 	}
 
 	/**
-	 * @param {Object} channel_props
-	 * @param {Long} channel_props.id
-	 * @param {ChannelType} channel_props.type
+	 * @param {ChannelProps} channelProps
 	 */
-	async getChannel(channel_props) {
-		let channel = this.#talkClient.channelList.get(channel_props.id)
+	async getChannel(channelProps) {
+		let channel = this.#talkClient.channelList.get(channelProps.id)
 		if (channel) {
 			return channel
 		} else {
 			const channelList = getChannelListForType(
 				this.#talkClient.channelList,
-				channel_props.type
+				channelProps.type
 			)
 			const res = await channelList.addChannel({
-				channelId: channel_props.id,
+				channelId: channelProps.id,
 			})
 			if (!res.success) {
-				throw new Error(`Unable to add ${channel_props.type} channel ${channel_props.id}`)
+				throw new Error(`Unable to add ${channelProps.type} channel ${channelProps.id}`)
 			}
 			return res.result
 		}
@@ -347,10 +351,10 @@ export default class PeerClient {
 
 	/**
 	 * @param {string} mxid
-	 * @param {Object} channel_props
+	 * @param {ChannelProps} channelProps
 	 */
-	async #getUserChannel(mxid, channel_props) {
-		return await this.#getUser(mxid).getChannel(channel_props)
+	async #getUserChannel(mxid, channelProps) {
+		return await this.#getUser(mxid).getChannel(channelProps)
 	}
 
 	/**
@@ -424,7 +428,7 @@ export default class PeerClient {
 	/**
 	 * @param {Object} req
 	 * @param {string} req.mxid
-	 * @param {Object} req.channel_props
+	 * @param {ChannelProps} req.channel_props
 	 */
 	getPortalChannelInfo = async (req) => {
 		const talkChannel = await this.#getUserChannel(req.mxid, req.channel_props)
@@ -442,7 +446,7 @@ export default class PeerClient {
 	/**
 	 * @param {Object} req
 	 * @param {string} req.mxid
-	 * @param {Object} req.channel_props
+	 * @param {ChannelProps} req.channel_props
 	 */
 	getParticipants = async (req) => {
 		const talkChannel = await this.#getUserChannel(req.mxid, req.channel_props)
@@ -452,7 +456,7 @@ export default class PeerClient {
 	/**
 	 * @param {Object} req
 	 * @param {string} req.mxid
-	 * @param {Object} req.channel_props
+	 * @param {ChannelProps} req.channel_props
 	 * @param {?Long} req.sync_from
 	 * @param {?Number} req.limit
 	 */
@@ -506,7 +510,7 @@ export default class PeerClient {
 	/**
 	 * @param {Object} req
 	 * @param {string} req.mxid
-	 * @param {Object} req.channel_props
+	 * @param {ChannelProps} req.channel_props
 	 * @param {string} req.text
 	 * @param {?ReplyAttachment} req.reply_to
 	 * @param {?MentionStruct[]} req.mentions
@@ -524,7 +528,7 @@ export default class PeerClient {
 	/**
 	 * @param {Object} req
 	 * @param {string} req.mxid
-	 * @param {Object} req.channel_props
+	 * @param {ChannelProps} req.channel_props
 	 * @param {int} req.type
 	 * @param {number[]} req.data
 	 * @param {string} req.name
@@ -676,11 +680,18 @@ export default class PeerClient {
  * @param {ChannelType} channelType
  */
 function getChannelListForType(channelList, channelType) {
+	return isChannelTypeOpen(channelType) ? channelList.open : channelList.normal
+}
+
+/**
+ * @param {ChannelType} channelType
+ */
+function isChannelTypeOpen(channelType) {
 	switch (channelType) {
 	case "OM":
 	case "OD":
-		return channelList.open
+		return true
 	default:
-		return channelList.normal
+		return false
 	}
 }