diff --git a/src/@types/journalLines.d.ts b/src/@types/journalLines.d.ts
new file mode 100644
index 0000000..ad6bdf9
--- /dev/null
+++ b/src/@types/journalLines.d.ts
@@ -0,0 +1,183 @@
+interface journalEntry<eventType = string> {
+    timestamp: string,
+    event: eventType,
+}
+
+export interface discoveryHonk extends journalEntry<'FSSDiscoveryScan'> {
+    Progress: number,
+    BodyCount: number,
+    NonBodyCount: number,
+    SystemName: string,
+    SystemAddress: number,
+}
+
+export interface completedSystemFSSScan extends journalEntry<'FSSAllBodiesFound'> {
+    event: 'FSSAllBodiesFound',
+    SystemName: string,
+    SystemAddress: number,
+    Count: number,
+}
+
+export interface dssIndicator extends journalEntry<'SAAScanComplete'> {
+    BodyName: string,
+    SystemAddress: number,
+    BodyID: number,
+    ProbesUsed: number,
+    EfficiencyTarget: number,
+}
+
+interface bodyParent {
+    [index: string]: number,
+}
+
+interface bodyAtmosphere {
+    Name: string,
+    Percent: number,
+}
+
+interface bodyMaterials {
+    Name: string,
+    Percent: number,
+}
+
+interface bodyRings {
+    Name: string,
+    RingClass: string,
+    MassMT: number,
+    InnerRad: number,
+    OuterRad: number,
+}
+
+export interface starScan<scanType> extends journalEntry<'Scan'> {
+    ScanType: scanType,
+    BodyName: string,
+    BodyID: number,
+    Parents: bodyParent[],
+    StarSystem: string,
+    SystemAddress: number,
+    DistanceFromArrivalLS: number,
+    StarType: string,
+    Subclass: number,
+    StellarMass: number,
+    Radius: number,
+    AbsoluteMagnitude: number,
+    Age_MY: number,
+    SurfaceTemperature: number,
+    Luminosity: string,
+    SemiMajorAxis: number,
+    Eccentricity: number,
+    OrbitalInclination: number,
+    Periapsis: number,
+    OrbitalPeriod: number,
+    AscendingNode: number,
+    MeanAnomaly: number,
+    RotationPeriod: number,
+    AxialTilt: number,
+    WasDiscovered: boolean,
+    WasMapped: false,
+}
+
+export interface asteroidScan<scanType> extends journalEntry<'Scan'> {
+    ScanType: scanType,
+    BodyName: string,
+    BodyID: number,
+    Parents: bodyParent[],
+    StarSystem: string,
+    SystemAddress: number,
+    DistanceFromArrivalLS: number,
+    WasDiscovered: boolean,
+    WasMapped: false,
+}
+
+export interface planetScan<scanType> extends journalEntry<'Scan'> {
+    ScanType: scanType,
+    BodyName: string,
+    BodyID: number,
+    Parents: bodyParent[],
+    StarSystem: string,
+    SystemAddress: number,
+    DistanceFromArrivalLS: number,
+    TidalLock: boolean,
+    TerraformState: string,
+    PlanetClass: string,
+    Atmosphere: string,
+    AtmosphereType: string,
+    AtmosphereComposition?: bodyAtmosphere[]
+    Volcanism: string,
+    MassEM: number,
+    Radius: number,
+    SurfaceGravity: number,
+    SurfaceTemperature: number,
+    SurfacePressure: number,
+    Landable: boolean,
+    Materials: bodyMaterials[],
+    Composition: {
+        Ice: number,
+        Rock: number,
+        Metal: number,
+    },
+    SemiMajorAxis: number,
+    Eccentricity: number,
+    OrbitalInclination: number,
+    Periapsis: number,
+    OrbitalPeriod: number,
+    AscendingNode: number,
+    MeanAnomaly: number,
+    RotationPeriod: number,
+    AxialTilt: number,
+    Rings?: bodyRings[],
+    ReserveLevel?: string,
+    WasDiscovered: boolean,
+    WasMapped: boolean,
+}
+
+export type autoScan = starScan<'AutoScan'> & asteroidScan<'AutoScan'> & planetScan<'AutoScan'>
+export type discoveryScan = starScan<'Detailed'> & asteroidScan<'Detailed'> & planetScan<'Detailed'>
+export type fssScan = starScan<'Detailed'> & asteroidScan<'Detailed'> & planetScan<'Detailed'>
+export type dssScan = starScan<'Detailed'> & asteroidScan<'Detailed'> & planetScan<'Detailed'>
+
+export interface startFsdJump extends journalEntry<'StartJump'> {
+    JumpType: 'Hyperspace',
+    StarSystem: string,
+    SystemAddress: number,
+    StarClass: string,
+}
+
+interface faction {
+    Name: string,
+    FactionState: string,
+    Government: string,
+    Influence: number,
+    Allegiance: string,
+    Happiness: string,
+    Happiness_Localized: string,
+    MyReputation: number,
+    RecoveringStates?: {State: string, Trend: number}[],
+    ActiveStates?: {State: string}[],
+}
+
+export interface completeFsdJump extends journalEntry<'FSDJump'> {
+    Taxi: boolean,
+    Multicrew: boolean,
+    StarSystem: string,
+    SystemAddress: number,
+    StarPos: [number, number, number],
+    SystemAllegiance: string,
+    SystemEconomy: string,
+    SystemEconomy_Localised: string,
+    SystemSecondEconomy: string,
+    SystemSecondEconomy_Localised: string,
+    SystemGovernment: string,
+    SystemGovernment_Localised: string,
+    SystemSecurity: string,
+    SystemSecurity_Localised: string,
+    Population: number,
+    Body: string,
+    BodyID: number,
+    BodyType: string,
+    JumpDist: number,
+    FuelUsed: number,
+    FuelLevel: number,
+    Factions: faction[],
+    SystemFaction: {Name: string},
+}
\ No newline at end of file
diff --git a/src/interfaces/JournalInterface.js b/src/interfaces/JournalInterface.ts
similarity index 97%
rename from src/interfaces/JournalInterface.js
rename to src/interfaces/JournalInterface.ts
index 5f0dd07..49086b9 100644
--- a/src/interfaces/JournalInterface.js
+++ b/src/interfaces/JournalInterface.ts
@@ -18,7 +18,13 @@ const findIndex = require('lodash/findIndex')
 const log = console.log.bind(console)
 
 export class JournalInterface extends EventEmitter {
-    constructor(isPackaged) {
+    journalDir: null|string
+    journalPattern: string
+    currentJournal: string
+    location: null|System
+
+
+    constructor(isPackaged: boolean) {
         super()
 
         this.journalDir = null
@@ -35,6 +41,7 @@ export class JournalInterface extends EventEmitter {
         this.journalPattern = this.journalDir + "Journal.*.log"
 
         this.currentJournal = this.getLatestJournal()
+        log(`New journal file found, now watching ${path.basename(this.currentJournal)}.`)
 
         // LineReader seems to be async, so start async processes here.
         this.location = null
@@ -46,22 +53,20 @@ export class JournalInterface extends EventEmitter {
     /* -------------------------------------------------------------------- getLatestJournal ---- */
 
     // https://stackoverflow.com/questions/15696218/get-the-most-recent-file-in-a-directory-node-js
-    getLatestJournal() {
+    getLatestJournal(): string {
         const journals = globSync(this.journalPattern)
 
         return max(journals, file => {
             const fullPath = path.join(this.journalDir, file)
             return fs.statSync(fullPath).mtime
         })
-
-        log(`New journal file found, now watching ${path.basename(this.currentJournal)}.`)
     }
 
     /* ------------------------------------------------------------------ getCurrentLocation ---- */
 
     // Get current location on setup, so if app is restarted, user can pick up where they left off
     // Rather than waiting til they jump to the next system to use the program again.
-    getCurrentLocation() {
+    getCurrentLocation(): void {
         lineReader.eachLine(this.currentJournal, (raw, last) => {            
             if (raw) { // skip blank line at end of file
                 const line = JSON.parse(raw)
@@ -85,8 +90,8 @@ export class JournalInterface extends EventEmitter {
     /* -------------------------------------------------------------------- getScannedBodies ---- */
 
     // Look for all scanned bodies before last FSDJump, for same reasons as getCurrentLocation().
-    getScannedBodies() {
-        let detailedScanLine = null
+    getScannedBodies(): void {
+        let detailedScanLine: Object|null = null
 
         lineReader.eachLine(this.currentJournal, (raw, last) => {