diff --git a/src/index.d.ts b/src/index.d.ts
new file mode 100644
index 0000000..bb5bdc1
--- /dev/null
+++ b/src/index.d.ts
@@ -0,0 +1,222 @@
+/** Configuration object. */
+interface Config {
+    api: {
+        baseUrl: string;
+    };
+    endDateTime: Date;
+    ignorePingLocation: boolean;
+    locale: string;
+    map: {
+        attribution: string;
+        center: {
+          lat: number;
+          lng: number;
+        };
+        circle: {
+          color: OptionalColor;
+          fillColor: OptionalColor;
+          fillOpacity: number;
+        };
+        circleMarker: {
+          color: OptionalColor;
+          fillColor: OptionalColor;
+          fillOpacity: number;
+          radius: number;
+        };
+        controls: {
+          scale: {
+            display: boolean;
+            imperial: boolean;
+            maxWidth: number;
+            metric: boolean;
+            position: string;
+          };
+          zoom: {
+            display: boolean;
+            position: string;
+          };
+        };
+        heatmap: {
+          blur: number;
+          gradient: { number: Color } | null;
+          max: number;
+          radius: number;
+        };
+        layers: {
+          heatmap: boolean;
+          last: boolean;
+          line: boolean;
+          points: boolean;
+        };
+        maxNativeZoom: number;
+        maxPointDistance: number | null;
+        maxZoom: number;
+        polyline: {
+          color: OptionalColor;
+          fillColor: OptionalColor;
+        };
+        url: string;
+        zoom: number;
+    };
+    onLocationChange: {
+        reloadHistory: boolean;
+    };
+    primaryColor: Color;
+    selectedUser: User| null;
+    selectedDevice: Device| null;
+    startDateTime: Date;
+    verbose: boolean;
+}
+
+/** Vuex state. */
+interface State {
+    isLoading: boolean;
+    frontendVersion: string;
+    recorderVersion: string;
+    users: User[];
+    devices: { User: Device[] };
+    lastLocations: OTLocation[];
+    locationHistory: LocationHistory;
+    selectedUser: User| null;
+    selectedDevice: Device| null;
+    startDateTime: string;
+    endDateTime: string;
+    map: {
+        center: {
+            lat: number;
+            lng: number;
+        };
+        layers: {
+            heatmap: boolean;
+            last: boolean;
+            line: boolean;
+            points: boolean;
+        };
+        zoom: number;
+    };
+}
+
+/**
+ * A location object as returned by the OwnTracks recorder.
+ * https://owntracks.org/booklet/tech/json/#_typelocation
+ */
+interface OTLocation {
+    _http: boolean;
+    /**
+     * In this case always "location"
+     * https://owntracks.org/booklet/tech/json/#types
+     */
+    _type: string;
+    /** Accuracy in meters */
+    acc?: number;
+    /** Altitude above sea level in meters */
+    alt?: number;
+    /** Device battery level in percent */
+    batt?: number;
+    /**
+     * Battery status (iOS only)
+     *
+     * - `0` = unknown
+     * - `1` = unplugged
+     * - `2` = charging
+     * - `3` = full
+     */
+    bs?: number;
+    /** Course over ground in degrees (iOS only) */
+    cog?: number;
+    /**
+     * Internet connectivity status (route to host) when the message is created
+     *
+     * - `"w"` = phone is connected to a WiFi connection
+     * - `"o"` = phone is offline
+     * - `"m"` = mobile data
+     */
+    conn?: string;
+    /** Device name */
+    device?: Device;
+    /** Timestamp in a readable format */
+    disptst: string;
+    /** Base64-encoded face image (device icon) */
+    face?: string;
+    /**
+     * Geohash of the location
+     * https://en.wikipedia.org/wiki/Geohash
+     */
+    ghash?: string;
+    /** Regions the device is currently in (e.g. `["Home"; "Garage"]`). Might be empty. */
+    inregions?: string[];
+    /**
+     * No idea; some kind of timestamp as well - figure it out yourself. :)
+     * https://github.com/owntracks/recorder/blob/df009f791a845012e9cce24923e6203a079ca1ed/storage.c#L659
+     * https://github.com/owntracks/recorder/blob/df009f791a845012e9cce24923e6203a079ca1ed/storage.c#L704
+     */
+    isorcv?: string;
+    /** ISO 8601 timestamp */
+    isotst?: string;
+    /** Latitude in degrees */
+    lat: number;
+    /** Longitude in degrees */
+    lon: number;
+    /** Friendly device name */
+    name?: string;
+    /**
+     * Trigger for the location report
+     *
+     * - `"p"` = ping issued randomly by background task
+     * - `"c"` = circular region enter/leave event
+     * - `"b"` = beacon region enter/leave event (iOS only)
+     * - `"r"` = response to a reportLocation cmd message
+     * - `"u"` = manual publish requested by the user
+     * - `"t"` = timer based publish in move move (iOS only)
+     * - `"v"` = updated by Settings/Privacy/Locations Services/System Services/Frequent Locations monitoring (iOS only)
+     */
+    t?: string;
+    /** Tracker ID used to display the initials of a user */
+    tid?: string;
+    /**
+     * Original publish topic
+     * https://owntracks.org/booklet/tech/json/#topics
+     */
+    topic?: string;
+    /** UNIX epoch timestamp of the location fix in seconds */
+    tst: number;
+    /** User */
+    username?: User;
+    /** Vertical accuracy of the alt element in meters */
+    vac?: number;
+    /** Velocity in km/h */
+    vel?: number;
+}
+
+/** URL query parameters (prior to any parsing so it's all strings). */
+interface QueryParams {
+    /** Map center latitude */
+    lat?: string;
+    /** Map center longitude */
+    lng?: string;
+    /** Start date and time of selected time range */
+    start?: string;
+    /** End date and time of selected time range */
+    end?: string;
+    /** Selected user */
+    user?: string;
+    /** Selected device */
+    device?: string;
+    /** Comma-separated list of active layers */
+    layers?: string;
+}
+
+/** A CSS color. */
+type Color = string;
+
+/** A CSS color that will use `primaryColor` as fallback. */
+type OptionalColor = Color | null;
+
+/** A user's name. */
+type User = string;
+
+/** A device's name. */
+type Device = string;
+
+/** Multiple location histories mapped to user and devices. */
+type LocationHistory = { User: { Device: OTLocation[] } };