diff --git a/d2m/actions/register-user.js b/d2m/actions/register-user.js
index 7e1d9f9b..68b1a887 100644
--- a/d2m/actions/register-user.js
+++ b/d2m/actions/register-user.js
@@ -1,6 +1,6 @@
 // @ts-check
 
-const assert = require("assert")
+const assert = require("assert").strict
 const reg = require("../../matrix/read-registration")
 const DiscordTypes = require("discord-api-types/v10")
 const mixin = require("mixin-deep")
@@ -180,11 +180,12 @@ function _hashProfileContent(content, powerLevel) {
  * 5. If the state content or power level have changed, send them to Matrix and update them in the database for next time
  * @param {DiscordTypes.APIUser} user
  * @param {Omit<DiscordTypes.APIGuildMember, "user">} member
- * @param {DiscordTypes.APIGuild} guild
  * @param {DiscordTypes.APIGuildChannel} channel
+ * @param {DiscordTypes.APIGuild} guild
+ * @param {string} roomID
  * @returns {Promise<string>} mxid of the updated sim
  */
-async function syncUser(user, member, guild, channel, roomID) {
+async function syncUser(user, member, channel, guild, roomID) {
 	const mxid = await ensureSimJoined(user, roomID)
 	const content = await memberToStateContent(user, member, guild.id)
 	const powerLevel = memberToPowerLevel(user, member, guild, channel)
@@ -204,6 +205,9 @@ async function syncUser(user, member, guild, channel, roomID) {
 	return mxid
 }
 
+/**
+ * @param {string} roomID
+ */
 async function syncAllUsersInRoom(roomID) {
 	const mxids = select("sim_member", "mxid", {room_id: roomID}).pluck().all()
 
@@ -228,7 +232,7 @@ async function syncAllUsersInRoom(roomID) {
 		assert.ok(user)
 
 		console.log(`[user sync] to matrix: ${user.username} in ${channel.name}`)
-		await syncUser(user, member, guild, channel, roomID)
+		await syncUser(user, member, channel, guild, roomID)
 	}
 }
 
diff --git a/d2m/actions/send-message.js b/d2m/actions/send-message.js
index 8c26f071..a1290e05 100644
--- a/d2m/actions/send-message.js
+++ b/d2m/actions/send-message.js
@@ -1,6 +1,7 @@
 // @ts-check
 
-const assert = require("assert")
+const assert = require("assert").strict
+const DiscordTypes = require("discord-api-types/v10")
 
 const passthrough = require("../../passthrough")
 const { discord, sync, db } = passthrough
@@ -18,17 +19,18 @@ const createRoom = sync.require("../actions/create-room")
 const dUtils = sync.require("../../discord/utils")
 
 /**
- * @param {import("discord-api-types/v10").GatewayMessageCreateDispatchData} message
- * @param {import("discord-api-types/v10").APIGuild} guild
+ * @param {DiscordTypes.GatewayMessageCreateDispatchData} message
+ * @param {DiscordTypes.APIGuildChannel} channel
+ * @param {DiscordTypes.APIGuild} guild
  * @param {{speedbump_id: string, speedbump_webhook_id: string} | null} row data about the webhook which is proxying messages in this channel
  */
-async function sendMessage(message, guild, row) {
+async function sendMessage(message, channel, guild, row) {
 	const roomID = await createRoom.ensureRoom(message.channel_id)
 
 	let senderMxid = null
 	if (!dUtils.isWebhookMessage(message)) {
 		if (message.member) { // available on a gateway message create event
-			senderMxid = await registerUser.syncUser(message.author, message.member, message.guild_id, roomID)
+			senderMxid = await registerUser.syncUser(message.author, message.member, channel, guild, roomID)
 		} else { // well, good enough...
 			senderMxid = await registerUser.ensureSimJoined(message.author, roomID)
 		}
diff --git a/d2m/event-dispatcher.js b/d2m/event-dispatcher.js
index 3db1d459..2c4dcd51 100644
--- a/d2m/event-dispatcher.js
+++ b/d2m/event-dispatcher.js
@@ -248,7 +248,7 @@ module.exports = {
 		if (affected) return
 
 		// @ts-ignore
-		await sendMessage.sendMessage(message, guild, row),
+		await sendMessage.sendMessage(message, channel, guild, row),
 		await discordCommandHandler.execute(message, channel, guild)
 	},
 
diff --git a/discord/utils.js b/discord/utils.js
index ff1f2152..6b6b6025 100644
--- a/discord/utils.js
+++ b/discord/utils.js
@@ -63,7 +63,7 @@ function getPermissions(userRoles, guildRoles, userID, channelOverwrites) {
  */
 function hasPermission(resolvedPermissions, permissionToCheckFor) {
 	// Make sure permissionToCheckFor has exactly one permission in it
-	assert.equal(permissionToCheckFor.toString(2).match(/1/g), 1)
+	assert.equal(permissionToCheckFor.toString(2).match(/1/g)?.length, 1)
 	// Do the actual calculation
 	return (resolvedPermissions & permissionToCheckFor) === permissionToCheckFor
 }