diff --git a/src/app/src/App.vue b/src/app/src/App.vue
index ec693bd..9ebd92a 100644
--- a/src/app/src/App.vue
+++ b/src/app/src/App.vue
@@ -35,7 +35,7 @@ import Vue from 'vue'
 
 import Navigation from '@/components/common/Navigation'
 
-import actions from '@/store/action-types'
+import { Actions } from '@/store/types'
 import { version } from '../package.json'
 
 export default {
@@ -63,7 +63,7 @@ export default {
     this.progress.events.$on('done', this.hideProgress)
     this.snackbar.events.$on('info', this.showInfo)
     this.snackbar.events.$on('error', this.showError)
-    await this.$store.dispatch(actions.CHECK_AUTHENTICATION)
+    await this.$store.dispatch(Actions.CheckAuthentication)
   },
   computed: {
     version () {
diff --git a/src/app/src/api/index.ts b/src/app/src/api/index.ts
index 4766239..bcecb32 100644
--- a/src/app/src/api/index.ts
+++ b/src/app/src/api/index.ts
@@ -13,9 +13,9 @@ export default {
 
   /**
    * Set the bearer token for all future requests
-   * @param {string} token The token to use to identify the user to the server
+   * @param token The token to use to identify the user to the server
    */
-  setBearer: token => { http.defaults.headers.common.Authorization = `Bearer ${token}` },
+  setBearer: (token: string) => { http.defaults.headers.common.Authorization = `Bearer ${token}` },
 
   /**
    * Remove the bearer token
@@ -24,18 +24,19 @@ export default {
 
   /**
    * Add a note for a prayer request
-   * @param {string} requestId The Id of the request to which the note applies
-   * @param {string} notes The notes to be added
+   * @param requestId The Id of the request to which the note applies
+   * @param notes The notes to be added
    */
-  addNote: (requestId, notes) => http.post(`request/${requestId}/note`, { notes }),
+  addNote: (requestId: string, notes: string) => http.post(`request/${requestId}/note`, { notes }),
 
   /**
    * Add a new prayer request
-   * @param {string} requestText The text of the request to be added
-   * @param {string} recurType The type of recurrence for this request
-   * @param {number} recurCount The number of intervals of recurrence
+   * @param requestText The text of the request to be added
+   * @param recurType The type of recurrence for this request
+   * @param recurCount The number of intervals of recurrence
    */
-  addRequest: (requestText, recurType, recurCount) => http.post('request', { requestText, recurType, recurCount }),
+  addRequest: (requestText: string, recurType: string, recurCount: number) =>
+    http.post('request', { requestText, recurType, recurCount }),
 
   /**
    * Get all answered requests, along with the text they had when it was answered
@@ -44,21 +45,21 @@ export default {
 
   /**
    * Get a prayer request (full; includes all history and notes)
-   * @param {string} requestId The Id of the request to retrieve
+   * @param requestId The Id of the request to retrieve
    */
-  getFullRequest: requestId => http.get(`request/${requestId}/full`),
+  getFullRequest: (requestId: string) => http.get(`request/${requestId}/full`),
 
   /**
    * Get past notes for a prayer request
-   * @param {string} requestId The Id of the request for which notes should be retrieved
+   * @param requestId The Id of the request for which notes should be retrieved
    */
-  getNotes: requestId => http.get(`request/${requestId}/notes`),
+  getNotes: (requestId: string) => http.get(`request/${requestId}/notes`),
 
   /**
    * Get a prayer request (journal-style; only latest update)
-   * @param {string} requestId The Id of the request to retrieve
+   * @param requestId The Id of the request to retrieve
    */
-  getRequest: requestId => http.get(`request/${requestId}`),
+  getRequest: (requestId: string) => http.get(`request/${requestId}`),
 
   /**
    * Get all prayer requests and their most recent updates
@@ -67,32 +68,33 @@ export default {
 
   /**
    * Show a request after the given date (used for "show now")
-   * @param {string} requestId The ID of the request which should be shown
-   * @param {number} showAfter The ticks after which the request should be shown
+   * @param requestId The ID of the request which should be shown
+   * @param showAfter The ticks after which the request should be shown
    */
-  showRequest: (requestId, showAfter) => http.patch(`request/${requestId}/show`, { showAfter }),
+  showRequest: (requestId: string, showAfter: number) => http.patch(`request/${requestId}/show`, { showAfter }),
 
   /**
    * Snooze a request until the given time
-   * @param {string} requestId The ID of the prayer request to be snoozed
-   * @param {number} until The ticks until which the request should be snoozed
+   * @param requestId The ID of the prayer request to be snoozed
+   * @param until The ticks until which the request should be snoozed
    */
-  snoozeRequest: (requestId, until) => http.patch(`request/${requestId}/snooze`, { until }),
+  snoozeRequest: (requestId: string, until: number) => http.patch(`request/${requestId}/snooze`, { until }),
 
   /**
    * Update recurrence for a prayer request
-   * @param {string} requestId The ID of the prayer request for which recurrence is being updated
-   * @param {string} recurType The type of recurrence to set
-   * @param {number} recurCount The number of recurrence intervals to set
+   * @param requestId The ID of the prayer request for which recurrence is being updated
+   * @param recurType The type of recurrence to set
+   * @param recurCount The number of recurrence intervals to set
    */
-  updateRecurrence: (requestId, recurType, recurCount) =>
+  updateRecurrence: (requestId: string, recurType: string, recurCount: number) =>
     http.patch(`request/${requestId}/recurrence`, { recurType, recurCount }),
 
   /**
    * Update a prayer request
-   * @param {string} requestId The ID of the request to be updated
-   * @param {string} status The status of the update
-   * @param {string} updateText The text of the update (optional)
+   * @param requestId The ID of the request to be updated
+   * @param status The status of the update
+   * @param updateText The text of the update (optional)
    */
-  updateRequest: (requestId, status, updateText) => http.post(`request/${requestId}/history`, { status, updateText })
+  updateRequest: (requestId: string, status: string, updateText: string) =>
+    http.post(`request/${requestId}/history`, { status, updateText })
 }
diff --git a/src/app/src/auth/AuthService.ts b/src/app/src/auth/index.ts
similarity index 59%
rename from src/app/src/auth/AuthService.ts
rename to src/app/src/auth/index.ts
index 5a1c912..f10010d 100644
--- a/src/app/src/auth/AuthService.ts
+++ b/src/app/src/auth/index.ts
@@ -1,18 +1,18 @@
-'use strict'
-/* eslint-disable */
-import auth0            from 'auth0-js'
+import { Store } from 'vuex'
+import auth0, { Auth0DecodedHash } from 'auth0-js'
 import { EventEmitter } from 'events'
 
-import AUTH_CONFIG from './auth0-variables'
-import mutations   from '@/store/mutation-types'
-/* es-lint-enable*/
+import { Mutations, AppState } from '@/store/types'
+
+import Auth0Config from './auth0-variables'
+import { Session } from './types'
 
 // Auth0 web authentication instance to use for our calls
 const webAuth = new auth0.WebAuth({
-  domain: AUTH_CONFIG.domain,
-  clientID: AUTH_CONFIG.clientId,
-  redirectUri: AUTH_CONFIG.appDomain + AUTH_CONFIG.callbackUrl,
-  audience: `https://${AUTH_CONFIG.domain}/userinfo`,
+  domain: Auth0Config.domain,
+  clientID: Auth0Config.clientId,
+  redirectUri: Auth0Config.appDomain + Auth0Config.callbackUrl,
+  audience: `https://${Auth0Config.domain}/userinfo`,
   responseType: 'token id_token',
   scope: 'openid profile email'
 })
@@ -21,14 +21,13 @@ const webAuth = new auth0.WebAuth({
  * A class to handle all authentication calls and determinations
  */
 class AuthService extends EventEmitter {
-  
   // Local storage key for our session data
   AUTH_SESSION = 'auth-session'
 
   // Received and calculated values for our ssesion (initially loaded from local storage if present)
-  session: any = {}
+  session = new Session()
 
-  constructor() {
+  constructor () {
     super()
     this.refreshSession()
   }
@@ -36,7 +35,7 @@ class AuthService extends EventEmitter {
   /**
    * Starts the user log in flow
    */
-  login (customState) {
+  login (customState: any) {
     webAuth.authorize({
       appState: customState
     })
@@ -45,10 +44,10 @@ class AuthService extends EventEmitter {
   /**
    * Promisified parseHash function
    */
-  parseHash () {
+  parseHash (): Promise<Auth0DecodedHash> {
     return new Promise((resolve, reject) => {
       webAuth.parseHash((err, authResult) => {
-        if (err) {
+        if (err || authResult === null) {
           reject(err)
         } else {
           resolve(authResult)
@@ -59,33 +58,31 @@ class AuthService extends EventEmitter {
 
   /**
    * Handle authentication replies from Auth0
-   * 
    * @param store The Vuex store
    */
-  async handleAuthentication (store) {
+  async handleAuthentication (store: Store<AppState>) {
     try {
-      const authResult: any = await this.parseHash()
+      const authResult = await this.parseHash()
       if (authResult && authResult.accessToken && authResult.idToken) {
         this.setSession(authResult)
-        store.commit(mutations.USER_LOGGED_ON, this.session.profile)
+        store.commit(Mutations.UserLoggedOn, this.session.profile)
       }
-    } catch(err) {
-      console.error(err)
+    } catch (err) {
+      console.error(err) // eslint-disable-line no-console
       alert(`Error: ${err.error}. Check the console for further details.`)
     }
   }
 
   /**
    * Set up the session and commit it to local storage
-   * 
    * @param authResult The authorization result
    */
-  setSession (authResult) {
+  setSession (authResult: Auth0DecodedHash) {
     this.session.profile = authResult.idTokenPayload
-    this.session.id.token = authResult.idToken
+    this.session.id.token = authResult.idToken!
     this.session.id.expiry = this.session.profile.exp * 1000
-    this.session.access.token = authResult.accessToken
-    this.session.access.expiry = authResult.expiresIn * 1000 + Date.now()
+    this.session.access.token = authResult.accessToken!
+    this.session.access.expiry = authResult.expiresIn! * 1000 + Date.now()
 
     localStorage.setItem(this.AUTH_SESSION, JSON.stringify(this.session))
 
@@ -100,25 +97,27 @@ class AuthService extends EventEmitter {
    * Refresh this instance's session from the one in local storage
    */
   refreshSession () {
-    this.session = 
+    const emptySession = {
+      profile: {},
+      id: {
+        token: null,
+        expiry: null
+      },
+      access: {
+        token: null,
+        expiry: null
+      }
+    }
+    this.session =
       localStorage.getItem(this.AUTH_SESSION)
-      ? JSON.parse(localStorage.getItem(this.AUTH_SESSION) || '{}')
-      : { profile: {},
-          id: {
-            token: null,
-            expiry: null
-          },
-          access: {
-            token: null,
-            expiry: null
-          }
-        }
+        ? JSON.parse(localStorage.getItem(this.AUTH_SESSION) || '{}')
+        : emptySession
   }
 
   /**
    * Renew authorzation tokens with Auth0
    */
-  renewTokens () {
+  renewTokens (): Promise<Auth0DecodedHash> {
     return new Promise((resolve, reject) => {
       this.refreshSession()
       if (this.session.id.token !== null) {
@@ -126,67 +125,58 @@ class AuthService extends EventEmitter {
           if (err) {
             reject(err)
           } else {
-            this.setSession(authResult)
-            resolve(authResult)
+            const result = authResult as Auth0DecodedHash
+            this.setSession(result)
+            resolve(result)
           }
         })
       } else {
-        reject('Not logged in')
+        reject(new Error('Not logged in'))
       }
     })
   }
 
   /**
    * Log out of myPrayerJournal
-   * 
    * @param store The Vuex store
    */
-  logout (store) {
+  logout (store: Store<AppState>) {
     // Clear access token and ID token from local storage
     localStorage.removeItem(this.AUTH_SESSION)
     this.refreshSession()
 
-    store.commit(mutations.USER_LOGGED_OFF)
+    store.commit(Mutations.UserLoggedOff)
 
     webAuth.logout({
-      returnTo: `${AUTH_CONFIG.appDomain}/`,
-      clientID: AUTH_CONFIG.clientId
+      returnTo: `${Auth0Config.appDomain}/`,
+      clientID: Auth0Config.clientId
     })
     this.emit('loginEvent', { loggedIn: false })
   }
 
-  /**
-   * Check expiration for a token (the way it's stored in the session)
-   */
-  checkExpiry = (it) => it.token && it.expiry && Date.now() < it.expiry
-  
   /**
    * Is there a user authenticated?
    */
   isAuthenticated () {
-    return this.checkExpiry(this.session.id)
+    return this.session.id.isValid()
   }
 
   /**
    * Is the current access token valid?
    */
   isAccessTokenValid () {
-    return this.checkExpiry(this.session.access)
+    return this.session.access.isValid()
   }
 
   /**
    * Get the user's access token, renewing it if required
    */
-  async getAccessToken () {
+  async getAccessToken (): Promise<string> {
     if (this.isAccessTokenValid()) {
       return this.session.access.token
     } else {
-      try {
-        const authResult: any = await this.renewTokens()
-        return authResult.accessToken
-      } catch (reject) {
-        throw reject
-      }
+      const authResult = await this.renewTokens()
+      return authResult.accessToken!
     }
   }
 }
diff --git a/src/app/src/auth/types.ts b/src/app/src/auth/types.ts
new file mode 100644
index 0000000..e3bc8af
--- /dev/null
+++ b/src/app/src/auth/types.ts
@@ -0,0 +1,25 @@
+/** A token and expiration set */
+export class Token {
+  /** The actual token */
+  token: string = ''
+
+  /** The expiration for the token */
+  expiry: number = 0
+
+  /** Whether this token is currently valid */
+  isValid (): boolean {
+    return this.token !== '' && this.expiry !== 0 && Date.now() < this.expiry
+  }
+}
+
+/** A user's current session */
+export class Session {
+  /** The user's profile from Auth0 */
+  profile: any = {}
+
+  /** The user's ID token */
+  id = new Token()
+
+  /** The user's access token */
+  access = new Token()
+}
diff --git a/src/app/src/components/Journal.vue b/src/app/src/components/Journal.vue
index f5d30bf..a44b50e 100644
--- a/src/app/src/components/Journal.vue
+++ b/src/app/src/components/Journal.vue
@@ -31,7 +31,7 @@ import NotesEdit from './request/NotesEdit'
 import RequestCard from './request/RequestCard'
 import SnoozeRequest from './request/SnoozeRequest'
 
-import actions from '@/store/action-types'
+import { Actions } from '@/store/types'
 
 export default {
   name: 'journal',
@@ -59,7 +59,7 @@ export default {
     ...mapState(['user', 'journal', 'isLoadingJournal'])
   },
   async created () {
-    await this.$store.dispatch(actions.LOAD_JOURNAL, this.progress)
+    await this.$store.dispatch(Actions.LoadJournal, this.progress)
     this.messages.$emit('info', `Loaded ${this.journal.length} prayer requests`)
   },
   provide () {
diff --git a/src/app/src/components/request/ActiveRequests.vue b/src/app/src/components/request/ActiveRequests.vue
index 5353488..504edc8 100644
--- a/src/app/src/components/request/ActiveRequests.vue
+++ b/src/app/src/components/request/ActiveRequests.vue
@@ -21,7 +21,7 @@ import { mapState } from 'vuex'
 
 import RequestList from '@/components/request/RequestList'
 
-import actions from '@/store/action-types'
+import { Actions } from '@/store/types'
 
 export default {
   name: 'active-requests',
@@ -46,7 +46,7 @@ export default {
     async ensureJournal () {
       if (!Array.isArray(this.journal)) {
         this.loaded = false
-        await this.$store.dispatch(actions.LOAD_JOURNAL, this.progress)
+        await this.$store.dispatch(Actions.LoadJournal, this.progress)
       }
       this.requests = this.journal
         .sort((a, b) => a.showAfter - b.showAfter)
diff --git a/src/app/src/components/request/EditRequest.vue b/src/app/src/components/request/EditRequest.vue
index 8c578ac..2f0110a 100644
--- a/src/app/src/components/request/EditRequest.vue
+++ b/src/app/src/components/request/EditRequest.vue
@@ -54,7 +54,7 @@ md-content(role='main').mpj-narrow
 
 import { mapState } from 'vuex'
 
-import actions from '@/store/action-types'
+import { Actions } from '@/store/types'
 
 export default {
   name: 'edit-request',
@@ -114,7 +114,7 @@ export default {
       this.title = 'Edit Prayer Request'
       this.isNew = false
       if (this.journal.length === 0) {
-        await this.$store.dispatch(actions.LOAD_JOURNAL, this.progress)
+        await this.$store.dispatch(Actions.LoadJournal, this.progress)
       }
       const req = this.journal.filter(r => r.requestId === this.id)[0]
       this.form.requestId = this.id
@@ -140,12 +140,12 @@ export default {
     },
     async ensureJournal () {
       if (!Array.isArray(this.journal)) {
-        await this.$store.dispatch(actions.LOAD_JOURNAL, this.progress)
+        await this.$store.dispatch(Actions.LoadJournal, this.progress)
       }
     },
     async saveRequest () {
       if (this.isNew) {
-        await this.$store.dispatch(actions.ADD_REQUEST, {
+        await this.$store.dispatch(Actions.AddRequest, {
           progress: this.progress,
           requestText: this.form.requestText,
           recurType: this.form.recur.typ === 'Immediate' ? 'Immediate' : this.form.recur.other,
@@ -153,7 +153,7 @@ export default {
         })
         this.messages.$emit('info', 'New prayer request added')
       } else {
-        await this.$store.dispatch(actions.UPDATE_REQUEST, {
+        await this.$store.dispatch(Actions.UpdateRequest, {
           progress: this.progress,
           requestId: this.form.requestId,
           updateText: this.form.requestText,
diff --git a/src/app/src/components/request/RequestCard.vue b/src/app/src/components/request/RequestCard.vue
index a3b5fbf..bb6dab0 100644
--- a/src/app/src/components/request/RequestCard.vue
+++ b/src/app/src/components/request/RequestCard.vue
@@ -27,7 +27,7 @@ md-card(v-if='shouldDisplay'
 <script>
 'use strict'
 
-import actions from '@/store/action-types'
+import { Actions } from '@/store/types'
 
 export default {
   name: 'request-card',
@@ -47,7 +47,7 @@ export default {
   },
   methods: {
     async markPrayed () {
-      await this.$store.dispatch(actions.UPDATE_REQUEST, {
+      await this.$store.dispatch(Actions.UpdateRequest, {
         progress: this.progress,
         requestId: this.request.requestId,
         status: 'Prayed',
diff --git a/src/app/src/components/request/RequestListItem.vue b/src/app/src/components/request/RequestListItem.vue
index 9edbcce..bfad4b5 100644
--- a/src/app/src/components/request/RequestListItem.vue
+++ b/src/app/src/components/request/RequestListItem.vue
@@ -31,7 +31,7 @@ md-table-row
 <script>
 'use strict'
 
-import actions from '@/store/action-types'
+import { Actions } from '@/store/types'
 
 export default {
   name: 'request-list-item',
@@ -61,7 +61,7 @@ export default {
   },
   methods: {
     async cancelSnooze () {
-      await this.$store.dispatch(actions.SNOOZE_REQUEST, {
+      await this.$store.dispatch(Actions.SnoozeRequest, {
         progress: this.progress,
         requestId: this.request.requestId,
         until: 0
@@ -73,7 +73,7 @@ export default {
       this.$router.push({ name: 'EditRequest', params: { id: this.request.requestId } })
     },
     async showNow () {
-      await this.$store.dispatch(actions.SHOW_REQUEST_NOW, {
+      await this.$store.dispatch(Actions.ShowRequestNow, {
         progress: this.progress,
         requestId: this.request.requestId,
         showAfter: 0
diff --git a/src/app/src/components/request/SnoozeRequest.vue b/src/app/src/components/request/SnoozeRequest.vue
index 472894e..c716e9b 100644
--- a/src/app/src/components/request/SnoozeRequest.vue
+++ b/src/app/src/components/request/SnoozeRequest.vue
@@ -15,7 +15,7 @@ md-dialog(:md-active.sync='snoozeVisible').mpj-skinny
 <script>
 'use strict'
 
-import actions from '@/store/action-types'
+import { Actions } from '@/store/types'
 
 export default {
   name: 'snooze-request',
@@ -56,7 +56,7 @@ export default {
       this.snoozeVisible = true
     },
     async snoozeRequest () {
-      await this.$store.dispatch(actions.SNOOZE_REQUEST, {
+      await this.$store.dispatch(Actions.SnoozeRequest, {
         progress: this.progress,
         requestId: this.form.requestId,
         until: Date.parse(this.form.snoozedUntil)
diff --git a/src/app/src/components/request/SnoozedRequests.vue b/src/app/src/components/request/SnoozedRequests.vue
index 0b50e0c..c6c41fb 100644
--- a/src/app/src/components/request/SnoozedRequests.vue
+++ b/src/app/src/components/request/SnoozedRequests.vue
@@ -19,7 +19,7 @@ article.mpj-main-content(role='main')
 
 import { mapState } from 'vuex'
 
-import actions from '@/store/action-types'
+import { Actions } from '@/store/types'
 
 import RequestList from '@/components/request/RequestList'
 
@@ -45,7 +45,7 @@ export default {
     async ensureJournal () {
       if (!Array.isArray(this.journal)) {
         this.loaded = false
-        await this.$store.dispatch(actions.LOAD_JOURNAL, this.progress)
+        await this.$store.dispatch(Actions.LoadJournal, this.progress)
       }
       this.requests = this.journal
         .filter(req => req.snoozedUntil > Date.now())
diff --git a/src/app/src/plugins/auth.ts b/src/app/src/plugins/auth.ts
index 003dd50..b1e4feb 100644
--- a/src/app/src/plugins/auth.ts
+++ b/src/app/src/plugins/auth.ts
@@ -1,6 +1,4 @@
-'use strict'
-
-import authService from '../auth/AuthService'
+import authService from '@/auth'
 
 export default {
   install (Vue) {
diff --git a/src/app/src/router.ts b/src/app/src/router.ts
index 7143fee..799ab34 100644
--- a/src/app/src/router.ts
+++ b/src/app/src/router.ts
@@ -1,12 +1,8 @@
-'use strict'
-
-/* eslint-disable */
-import Vue    from 'vue'
+import Vue from 'vue'
 import Router from 'vue-router'
 
-import auth from './auth/AuthService'
+import auth from '@/auth'
 import Home from '@/components/Home.vue'
-/* eslint-enable */
 
 Vue.use(Router)
 
diff --git a/src/app/src/store/action-types.ts b/src/app/src/store/action-types.ts
deleted file mode 100644
index 9b20443..0000000
--- a/src/app/src/store/action-types.ts
+++ /dev/null
@@ -1,16 +0,0 @@
-'use strict'
-
-export default {
-  /** Action to add a prayer request (pass request text) */
-  ADD_REQUEST: 'add-request',
-  /** Action to check if a user is authenticated, refreshing the session first if it exists */
-  CHECK_AUTHENTICATION: 'check-authentication',
-  /** Action to load the user's prayer journal */
-  LOAD_JOURNAL: 'load-journal',
-  /** Action to update a request */
-  UPDATE_REQUEST: 'update-request',
-  /** Action to skip the remaining recurrence period */
-  SHOW_REQUEST_NOW: 'show-request-now',
-  /** Action to snooze a request */
-  SNOOZE_REQUEST: 'snooze-request'
-}
diff --git a/src/app/src/store/index.ts b/src/app/src/store/index.ts
index afd1fc4..c91dc4b 100644
--- a/src/app/src/store/index.ts
+++ b/src/app/src/store/index.ts
@@ -1,20 +1,15 @@
-'use strict'
+import Vue from 'vue'
+import Vuex, { StoreOptions } from 'vuex'
 
-/* eslint-disable no-multi-spaces */
-import Vue  from 'vue'
-import Vuex from 'vuex'
+import api from '@/api'
+import auth from '@/auth'
 
-import api  from '@/api'
-import auth from '@/auth/AuthService'
-
-import mutations from './mutation-types'
-import actions   from './action-types'
-/* eslint-enable no-multi-spaces */
+import { AppState, Actions, JournalRequest, Mutations } from './types'
 
 Vue.use(Vuex)
 
 /* eslint-disable no-console */
-const logError = function (error) {
+const logError = function (error: any) { // TODO: can we do better on this type?
   if (error.response) {
     // The request was made and the server responded with a status code
     // that falls out of the range of 2xx
@@ -41,7 +36,7 @@ const setBearer = async function () {
     await auth.getAccessToken()
     api.setBearer(auth.session.id.token)
   } catch (err) {
-    if (err === 'Not logged in') {
+    if (err.message === 'Not logged in') {
       console.warn('API request attempted when user was not logged in')
     } else {
       console.error(err)
@@ -54,88 +49,87 @@ const setBearer = async function () {
  * Get the sort value for a prayer request
  * @param x The prayer request
  */
-const sortValue = x => x.showAfter === 0 ? x.asOf : x.showAfter
+const sortValue = (x: JournalRequest) => x.showAfter === 0 ? x.asOf : x.showAfter
 
 /**
  * Sort journal requests either by asOf or showAfter
  */
-const journalSort = (a, b) => sortValue(a) - sortValue(b)
+const journalSort = (a: JournalRequest, b: JournalRequest) => sortValue(a) - sortValue(b)
 
-const emptyJournal: any = []
-
-export default new Vuex.Store({
+/** The initial state of the store */
+const store : StoreOptions<AppState> = {
   state: {
     user: auth.session.profile,
     isAuthenticated: auth.isAuthenticated(),
-    journal: emptyJournal,
+    journal: [],
     isLoadingJournal: false
   },
   mutations: {
-    [mutations.LOADING_JOURNAL] (state, flag) {
+    [Mutations.LoadingJournal] (state, flag: boolean) {
       state.isLoadingJournal = flag
     },
-    [mutations.LOADED_JOURNAL] (state, journal) {
+    [Mutations.LoadedJournal] (state, journal: JournalRequest[]) {
       state.journal = journal.sort(journalSort)
     },
-    [mutations.REQUEST_ADDED] (state, newRequest) {
+    [Mutations.RequestAdded] (state, newRequest: JournalRequest) {
       state.journal.push(newRequest)
     },
-    [mutations.REQUEST_UPDATED] (state, request) {
+    [Mutations.RequestUpdated] (state, request: JournalRequest) {
       const jrnl = state.journal.filter(it => it.requestId !== request.requestId)
       if (request.lastStatus !== 'Answered') jrnl.push(request)
       state.journal = jrnl
     },
-    [mutations.SET_AUTHENTICATION] (state, value) {
+    [Mutations.SetAuthentication] (state, value: boolean) {
       state.isAuthenticated = value
     },
-    [mutations.USER_LOGGED_OFF] (state) {
+    [Mutations.UserLoggedOff] (state) {
       state.user = {}
       api.removeBearer()
       state.isAuthenticated = false
     },
-    [mutations.USER_LOGGED_ON] (state, user) {
+    [Mutations.UserLoggedOn] (state, user) {
       state.user = user
       state.isAuthenticated = true
     }
   },
   actions: {
-    async [actions.ADD_REQUEST] ({ commit }, { progress, requestText, recurType, recurCount }) {
+    async [Actions.AddRequest] ({ commit }, { progress, requestText, recurType, recurCount }) {
       progress.$emit('show', 'indeterminate')
       try {
         await setBearer()
         const newRequest = await api.addRequest(requestText, recurType, recurCount)
-        commit(mutations.REQUEST_ADDED, newRequest.data)
+        commit(Mutations.RequestAdded, newRequest.data)
         progress.$emit('done')
       } catch (err) {
         logError(err)
         progress.$emit('done')
       }
     },
-    async [actions.CHECK_AUTHENTICATION] ({ commit }) {
+    async [Actions.CheckAuthentication] ({ commit }) {
       try {
         await auth.getAccessToken()
-        commit(mutations.SET_AUTHENTICATION, auth.isAuthenticated())
+        commit(Mutations.SetAuthentication, auth.isAuthenticated())
       } catch (_) {
-        commit(mutations.SET_AUTHENTICATION, false)
+        commit(Mutations.SetAuthentication, false)
       }
     },
-    async [actions.LOAD_JOURNAL] ({ commit }, progress) {
-      commit(mutations.LOADED_JOURNAL, [])
+    async [Actions.LoadJournal] ({ commit }, progress) {
+      commit(Mutations.LoadedJournal, [])
       progress.$emit('show', 'query')
-      commit(mutations.LOADING_JOURNAL, true)
+      commit(Mutations.LoadingJournal, true)
       await setBearer()
       try {
         const jrnl = await api.journal()
-        commit(mutations.LOADED_JOURNAL, jrnl.data)
+        commit(Mutations.LoadedJournal, jrnl.data)
         progress.$emit('done')
       } catch (err) {
         logError(err)
         progress.$emit('done')
       } finally {
-        commit(mutations.LOADING_JOURNAL, false)
+        commit(Mutations.LoadingJournal, false)
       }
     },
-    async [actions.UPDATE_REQUEST] ({ commit, state }, { progress, requestId, status, updateText, recurType, recurCount }) {
+    async [Actions.UpdateRequest] ({ commit, state }, { progress, requestId, status, updateText, recurType, recurCount }) {
       progress.$emit('show', 'indeterminate')
       try {
         await setBearer()
@@ -149,33 +143,33 @@ export default new Vuex.Store({
           await api.updateRequest(requestId, status, oldReq.text !== updateText ? updateText : '')
         }
         const request = await api.getRequest(requestId)
-        commit(mutations.REQUEST_UPDATED, request.data)
+        commit(Mutations.RequestUpdated, request.data)
         progress.$emit('done')
       } catch (err) {
         logError(err)
         progress.$emit('done')
       }
     },
-    async [actions.SHOW_REQUEST_NOW] ({ commit }, { progress, requestId, showAfter }) {
+    async [Actions.ShowRequestNow] ({ commit }, { progress, requestId, showAfter }) {
       progress.$emit('show', 'indeterminate')
       try {
         await setBearer()
         await api.showRequest(requestId, showAfter)
         const request = await api.getRequest(requestId)
-        commit(mutations.REQUEST_UPDATED, request.data)
+        commit(Mutations.RequestUpdated, request.data)
         progress.$emit('done')
       } catch (err) {
         logError(err)
         progress.$emit('done')
       }
     },
-    async [actions.SNOOZE_REQUEST] ({ commit }, { progress, requestId, until }) {
+    async [Actions.SnoozeRequest] ({ commit }, { progress, requestId, until }) {
       progress.$emit('show', 'indeterminate')
       try {
         await setBearer()
         await api.snoozeRequest(requestId, until)
         const request = await api.getRequest(requestId)
-        commit(mutations.REQUEST_UPDATED, request.data)
+        commit(Mutations.RequestUpdated, request.data)
         progress.$emit('done')
       } catch (err) {
         logError(err)
@@ -185,4 +179,6 @@ export default new Vuex.Store({
   },
   getters: {},
   modules: {}
-})
+}
+
+export default new Vuex.Store<AppState>(store)
diff --git a/src/app/src/store/mutation-types.ts b/src/app/src/store/mutation-types.ts
deleted file mode 100644
index b59c3c5..0000000
--- a/src/app/src/store/mutation-types.ts
+++ /dev/null
@@ -1,18 +0,0 @@
-'use strict'
-
-export default {
-  /** Mutation for when the user's prayer journal is being loaded */
-  LOADING_JOURNAL: 'loading-journal',
-  /** Mutation for when the user's prayer journal has been loaded */
-  LOADED_JOURNAL: 'journal-loaded',
-  /** Mutation for adding a new prayer request (pass text) */
-  REQUEST_ADDED: 'request-added',
-  /** Mutation to replace a prayer request at the top of the current journal */
-  REQUEST_UPDATED: 'request-updated',
-  /** Mutation for setting the authentication state */
-  SET_AUTHENTICATION: 'set-authentication',
-  /** Mutation for logging a user off */
-  USER_LOGGED_OFF: 'user-logged-off',
-  /** Mutation for logging a user on (pass user) */
-  USER_LOGGED_ON: 'user-logged-on'
-}
diff --git a/src/app/src/store/types.ts b/src/app/src/store/types.ts
new file mode 100644
index 0000000..3e49cec
--- /dev/null
+++ b/src/app/src/store/types.ts
@@ -0,0 +1,95 @@
+/** A prayer request that is part of the user's journal */
+export interface JournalRequest {
+  /** The ID of the request (just the CUID part) */
+  requestId: string
+
+  /** The ID of the user to whom the request belongs */
+  userId: string
+
+  /** The current text of the request */
+  text: string
+
+  /** The last time action was taken on the request */
+  asOf: number
+
+  /** The last status for the request */
+  lastStatus: string // TODO string union?
+
+  /** The time that this request should reappear in the user's journal */
+  snoozedUntil: number
+
+  /** The time after which this request should reappear in the user's journal by configured recurrence */
+  showAfter: number
+
+  /** The type of recurrence for this request */
+  recurType: string // TODO Recurrence union?
+
+  /** How many of the recurrence intervals should occur between appearances in the journal */
+  recurCount: number
+
+  /** History entries for the request */
+  history: any[] // History list
+
+  /** Note entries for the request */
+  notes: any[] // Note list
+}
+
+/** The state of myPrayerJournal */
+export interface AppState {
+  /** The user's profile */
+  user: any,
+
+  /** Whether there is a user signed in */
+  isAuthenticated: boolean,
+
+  /** The current set of prayer requests */
+  journal: JournalRequest[],
+
+  /** Whether the journal is currently being loaded */
+  isLoadingJournal: boolean
+}
+
+const actions = {
+  /** Action to add a prayer request (pass request text) */
+  AddRequest: 'add-request',
+
+  /** Action to check if a user is authenticated, refreshing the session first if it exists */
+  CheckAuthentication: 'check-authentication',
+
+  /** Action to load the user's prayer journal */
+  LoadJournal: 'load-journal',
+
+  /** Action to update a request */
+  UpdateRequest: 'update-request',
+
+  /** Action to skip the remaining recurrence period */
+  ShowRequestNow: 'show-request-now',
+
+  /** Action to snooze a request */
+  SnoozeRequest: 'snooze-request'
+}
+export { actions as Actions }
+
+const mutations = {
+  /** Mutation for when the user's prayer journal is being loaded */
+  LoadingJournal: 'loading-journal',
+
+  /** Mutation for when the user's prayer journal has been loaded */
+  LoadedJournal: 'journal-loaded',
+
+  /** Mutation for adding a new prayer request (pass text) */
+  RequestAdded: 'request-added',
+
+  /** Mutation to replace a prayer request at the top of the current journal */
+  RequestUpdated: 'request-updated',
+
+  /** Mutation for setting the authentication state */
+  SetAuthentication: 'set-authentication',
+
+  /** Mutation for logging a user off */
+  UserLoggedOff: 'user-logged-off',
+
+  /** Mutation for logging a user on (pass user) */
+  UserLoggedOn: 'user-logged-on'
+}
+export { mutations as Mutations }