diff --git a/.woodpecker.yml b/.woodpecker.yml
index 9a45e0b..f2c7f5f 100644
--- a/.woodpecker.yml
+++ b/.woodpecker.yml
@@ -40,7 +40,7 @@ pipeline:
     image: *node_image
     commands:
       - *create_synapse_access_token
-      - npm test
+      - npm test --ci
 
   node-compile:
     image: *node_image
diff --git a/src/handlers/rooms.test.ts b/src/handlers/rooms.test.ts
index b166001..bf3e80a 100644
--- a/src/handlers/rooms.test.ts
+++ b/src/handlers/rooms.test.ts
@@ -2,6 +2,7 @@ import { expect, jest, test } from '@jest/globals'
 import axios from 'axios'
 import { IdMapping } from '../entity/IdMapping'
 import * as storage from '../helpers/storage'
+import { SessionOptions } from '../helpers/synapse'
 import {
   MatrixRoomPresets,
   MatrixRoomVisibility,
@@ -54,7 +55,7 @@ const rcPrivateRoom = {
   u: roomCreator,
 }
 
-const sessionOption = {
+const sessionOption: SessionOptions = {
   headers: { Authorization: 'Bearer secretAuthToken' },
   testingOption: 'there might be other options',
 }
diff --git a/src/handlers/rooms.ts b/src/handlers/rooms.ts
index 3a4b954..0ed2897 100644
--- a/src/handlers/rooms.ts
+++ b/src/handlers/rooms.ts
@@ -6,6 +6,7 @@ import {
   getMemberships,
 } from '../helpers/storage'
 import {
+  SessionOptions,
   axios,
   formatUserSessionOptions,
   getUserSessionOptions,
@@ -114,7 +115,7 @@ export async function parseMemberships(rcRoom: RcRoom): Promise<void> {
 
 export async function getCreatorSessionOptions(
   creatorId: string
-): Promise<object> {
+): Promise<SessionOptions | object> {
   if (creatorId) {
     try {
       const creatorSessionOptions = await getUserSessionOptions(creatorId)
@@ -129,7 +130,7 @@ export async function getCreatorSessionOptions(
 
 export async function registerRoom(
   room: MatrixRoom,
-  creatorSessionOptions: object
+  creatorSessionOptions: SessionOptions | object
 ): Promise<string> {
   return (
     await axios.post(
@@ -143,7 +144,7 @@ export async function registerRoom(
 export async function inviteMember(
   inviteeId: string,
   roomId: string,
-  creatorSessionOptions: object
+  creatorSessionOptions: SessionOptions | object
 ): Promise<void> {
   log.http(`Invite member ${inviteeId}`)
   await axios.post(
diff --git a/src/handlers/roomsWithMockedSynapse.test.ts b/src/handlers/roomsWithMockedSynapse.test.ts
index a944f06..5ae7119 100644
--- a/src/handlers/roomsWithMockedSynapse.test.ts
+++ b/src/handlers/roomsWithMockedSynapse.test.ts
@@ -1,5 +1,5 @@
+import { expect, jest, test } from '@jest/globals'
 import { getUserSessionOptions } from '../helpers/synapse'
-import { jest, expect, test } from '@jest/globals'
 import { getCreatorSessionOptions } from './rooms'
 
 jest.mock('../helpers/synapse')
diff --git a/src/helpers/storage.ts b/src/helpers/storage.ts
index 3b8c8d3..961de7a 100644
--- a/src/helpers/storage.ts
+++ b/src/helpers/storage.ts
@@ -10,26 +10,32 @@ const AppDataSource = new DataSource({
   logging: false,
 })
 
-export async function initStorage() {
+export async function initStorage(): Promise<void> {
   await AppDataSource.initialize()
 }
 
-export function getMapping(id: string, type: number) {
+export function getMapping(
+  id: string,
+  type: number
+): Promise<IdMapping | null> {
   return AppDataSource.manager.findOneBy(IdMapping, {
     rcId: id,
     type: type,
   })
 }
 
-export async function save(entity: IdMapping | Membership) {
+export async function save(entity: IdMapping | Membership): Promise<void> {
   await AppDataSource.manager.save(entity)
 }
 
-export async function getAccessToken(id: string) {
+export async function getAccessToken(id: string): Promise<string | undefined> {
   return (await getMapping(id, 0))?.accessToken
 }
 
-export async function createMembership(rcRoomId: string, rcUserId: string) {
+export async function createMembership(
+  rcRoomId: string,
+  rcUserId: string
+): Promise<void> {
   const membership = new Membership()
   membership.rcRoomId = rcRoomId
   membership.rcUserId = rcUserId
@@ -37,7 +43,7 @@ export async function createMembership(rcRoomId: string, rcUserId: string) {
   await save(membership)
 }
 
-export async function getMemberships(rcRoomId: string) {
+export async function getMemberships(rcRoomId: string): Promise<string[]> {
   return (
     await AppDataSource.manager.find(Membership, {
       select: {
diff --git a/src/helpers/synapse.ts b/src/helpers/synapse.ts
index 3ab2990..da85899 100644
--- a/src/helpers/synapse.ts
+++ b/src/helpers/synapse.ts
@@ -7,6 +7,13 @@ axios.defaults.baseURL = 'http://localhost:8008'
 axios.defaults.headers.common['Authorization'] = `Bearer ${access_token}`
 axios.defaults.headers.post['Content-Type'] = 'application/json'
 
+export interface SessionOptions {
+  headers: {
+    Authorization: string
+  }
+  [others: string]: unknown
+}
+
 export { default as axios } from 'axios'
 export const whoami = () =>
   new Promise<void>((resolve, reject) => {
@@ -22,11 +29,13 @@ export const whoami = () =>
       })
   })
 
-export function formatUserSessionOptions(accessToken: string) {
+export function formatUserSessionOptions(accessToken: string): SessionOptions {
   return { headers: { Authorization: `Bearer ${accessToken}` } }
 }
 
-export async function getUserSessionOptions(id: string) {
+export async function getUserSessionOptions(
+  id: string
+): Promise<SessionOptions> {
   const accessToken = await getAccessToken(id)
   if (!accessToken) {
     throw new Error(`Could not retrieve access token for ID ${id}`)