[node] begin the great typescript rewrite

30 files changed, 877 insertions, 664 deletions

diff --git a/nodejs/.eslintrc.json b/nodejs/.eslintrc.json
deleted file mode 100644
index 47dd5e6..0000000
--- a/nodejs/.eslintrc.json
+++ /dev/null
@@ -1,44 +0,0 @@
-{
-	"env": {
-		"es2021": true,
-		"node": true
-	},
-	"extends": [
-		"eslint:recommended",
-		"plugin:node/recommended"
-	],
-	"overrides": [
-		{
-			"files": ["*.js"],
-			"rules": {
-				"no-constant-condition": "off"
-			}
-		}
-	],
-	"parserOptions": {
-		"ecmaVersion": "latest",
-		"sourceType": "module"
-	},
-	"rules": {
-		"indent": [
-			"error",
-			"tab"
-		],
-		"linebreak-style": [
-			"error",
-			"unix"
-		],
-		"quotes": [
-			"error",
-			"single"
-		],
-		"semi": [
-			"error",
-			"always"
-		],
-		"node/no-unsupported-features/es-syntax": [
-			"error",
-			{ "ignores": ["modules"] }
-		]
-	}
-}
diff --git a/nodejs/automation/contracting.js b/nodejs/automation/contracting.js
deleted file mode 100644
index 19183fb..0000000
--- a/nodejs/automation/contracting.js
+++ /dev/null
@@ -1,71 +0,0 @@
-import * as mining from './mining.js';
-import * as selling from './selling.js';
-import * as dbContracts from '../database/contracts.js';
-import * as dbShips from '../database/ships.js';
-import * as api from '../lib/api.js';
-import * as contracts from '../lib/contracts.js';
-import * as libShips from '../lib/ships.js';
-import * as systems from '../lib/systems.js';
-import * as utils from '../lib/utils.js';
-
-export async function init() {
-	const cs = dbContracts.getContracts();
-	cs.forEach(contract => run(contract));
-}
-
-async function run(contract) {
-	await contracts.accept({id: contract.id});
-	const contractSystem = utils.systemFromWaypoint(contract.terms.deliver[0].destinationSymbol);
-	let ships = dbShips.getShipsAt(contractSystem);
-	ships = ships.filter(ship => ship.registration.role !== 'SATELLITE'); // filter out probes
-
-	switch(contract.type) {
-	case 'PROCUREMENT':
-		await runProcurement(contract, ships);
-		break;
-	default:
-		throw `Handling of contract type ${contract.type} is not implemented yet`;
-	}
-}
-
-async function runProcurement(contract, ships) {
-	// TODO check if contract is fulfilled!
-	const wantedCargo = contract.terms.deliver[0].tradeSymbol;
-	const deliveryPoint = contract.terms.deliver[0].destinationSymbol;
-	const asteroids = await systems.type({symbol: ships[0].nav.systemSymbol, type: 'ENGINEERED_ASTEROID'});
-	const asteroidSymbol = asteroids[0].symbol;
-	ships.forEach(async function(ship) {
-		while (!dbContracts.getContract(contract.id).fulfilled) {
-			ship = dbShips.getShip(ship.symbol);
-			let goodCargo = ship.cargo.inventory.filter(i => i.symbol === wantedCargo)[0];
-			// If we are in transit, we wait until we arrive
-			const delay = new Date(ship.nav.route.arrival) - new Date();
-			if (delay > 0) await api.sleep(delay);
-			// Then it depends on where we are
-			switch (ship.nav.waypointSymbol) {
-			case asteroidSymbol:
-				await mining.mineUntilFullOf({
-					asteroidSymbol: asteroidSymbol,
-					good: wantedCargo,
-					symbol: ship.symbol
-				});
-				await libShips.navigate({symbol: ship.symbol, waypoint: deliveryPoint});
-				break;
-			case deliveryPoint:
-				if (goodCargo !== undefined) { // we could be here if a client restart happens right after selling before we navigate away
-					console.log(`delivering ${goodCargo.units} of ${wantedCargo}`);
-					if (await contracts.deliver({id: contract.id, symbol: ship.symbol, good: wantedCargo, units: goodCargo.units })) {
-						break;
-					}
-				}
-				await libShips.navigate({symbol: ship.symbol, waypoint: asteroidSymbol});
-				break;
-			default:
-				// we were either selling or started contracting
-				await selling.sell(ship, wantedCargo);
-				await libShips.navigate({symbol: ship.symbol, waypoint: asteroidSymbol});
-			}
-		}
-		// TODO repurpose the ship
-	});
-}
diff --git a/nodejs/automation/contracting.ts b/nodejs/automation/contracting.ts
new file mode 100644
index 0000000..2857778
--- /dev/null
+++ b/nodejs/automation/contracting.ts
@@ -0,0 +1,72 @@
+import { Contract } from '../model/contract.ts';
+import { Ship } from '../model/ship.ts';
+import * as mining from './mining.js';
+import * as selling from './selling.js';
+import * as dbContracts from '../database/contracts.ts';
+import * as dbShips from '../database/ships.ts';
+import * as api from '../lib/api.ts';
+import * as contracts from '../lib/contracts.ts';
+import * as libShips from '../lib/ships.ts';
+import * as systems from '../lib/systems.ts';
+import * as utils from '../lib/utils.ts';
+
+export async function init() {
+	const cs = dbContracts.getContracts();
+	cs.forEach(contract => run(contract));
+}
+
+async function run(contract: Contract) {
+	await contracts.accept(contract);
+	const contractSystem = utils.systemFromWaypoint(contract.terms.deliver[0].destinationSymbol);
+	let ships = dbShips.getShipsAt(contractSystem);
+	ships = ships.filter(ship => ship.registration.role !== 'SATELLITE'); // filter out probes
+
+	switch(contract.type) {
+		case 'PROCUREMENT':
+			await runProcurement(contract, ships);
+			break;
+		default:
+			throw `Handling of contract type ${contract.type} is not implemented yet`;
+	}
+}
+
+async function runProcurement(contract: Contract, ships: Array<Ship>) {
+	// TODO check if contract is fulfilled!
+	const wantedCargo = contract.terms.deliver[0].tradeSymbol;
+	const deliveryPoint = contract.terms.deliver[0].destinationSymbol;
+	const asteroids = await systems.type({symbol: ships[0].nav.systemSymbol, type: 'ENGINEERED_ASTEROID'});
+	const asteroidSymbol = asteroids[0].symbol;
+	ships.forEach(async function(ship) {
+		while (!contract.fulfilled) {
+			ship = dbShips.getShip(ship.symbol) as Ship;
+			let goodCargo = ship.cargo.inventory.filter(i => i.symbol === wantedCargo)[0]
+			// If we are in transit, we wait until we arrive
+			const delay = new Date(ship.nav.route.arrival).getTime() - new Date().getTime();
+			if (delay > 0) await api.sleep(delay);
+			// Then it depends on where we are
+			switch (ship.nav.waypointSymbol) {
+				case asteroidSymbol:
+					await mining.mineUntilFullOf({
+						asteroidSymbol: asteroidSymbol,
+						good: wantedCargo,
+						symbol: ship.symbol
+					});
+					await libShips.navigate(ship, deliveryPoint);
+					break;
+				case deliveryPoint:
+					if (goodCargo !== undefined) { // we could be here if a client restart happens right after selling before we navigate away
+						console.log(`delivering ${goodCargo.units} of ${wantedCargo}`);
+						contract = await contracts.deliver(contract, ship);
+						if (contract.fulfilled) break;
+					}
+					await libShips.navigate(ship, asteroidSymbol);
+					break;
+				default:
+					// we were either selling or started contracting
+					await selling.sell(ship, wantedCargo);
+					await libShips.navigate(ship, asteroidSymbol);
+			}
+		}
+		// TODO repurpose the ship
+	});
+}
diff --git a/nodejs/automation/init.js b/nodejs/automation/init.js
index b921942..93e5a70 100644
--- a/nodejs/automation/init.js
+++ b/nodejs/automation/init.js
@@ -6,6 +6,8 @@ import * as dbTokens from '../database/tokens.js';
 import * as api from '../lib/api.js';
 import * as ships from '../lib/ships.js';
 
+const symbol = process.env.NODE_ENV === 'test' ? 'ADYXAX-0' : 'ADYXAX-TS';
+
 // This function registers then inits the database
 export async function init() {
 	const response = await fetch('https://api.spacetraders.io/v2/register', {
@@ -14,7 +16,7 @@ export async function init() {
 			'Content-Type': 'application/json',
 		},
 		body: JSON.stringify({
-			symbol: "ADYXAX-JS",
+			symbol: symbol,
 			faction: "COSMIC",
 		}),
 	});
diff --git a/nodejs/automation/selling.js b/nodejs/automation/selling.js
index b52d52c..3d444af 100644
--- a/nodejs/automation/selling.js
+++ b/nodejs/automation/selling.js
@@ -8,65 +8,65 @@ import * as utils from '../lib/utils.js';
 // example ctx { ship: {XXX}, keep: 'SILVER_ORE' }
 export async function sell(ship, keep) {
     outer: while(true) {
-	// first lets see what we want to sell
-	let cargo = utils.categorizeCargo(ship.cargo, keep);
-	// get the marketdata from our location
-	const market = await libSystems.market(ship.nav.waypointSymbol);
-	// can we sell anything here?
-	const goods = whatCanBeTradedAt(cargo.goods, market.imports.concat(market.exchange));
-	for (let i = 0; i < goods.length; i++) {
-	    const symbol = goods[i].symbol;
-	    await libShips.sell({
-		good: symbol,
-		symbol: ship.symbol,
-		units: cargo.goods[symbol],
-	    });
-	    delete cargo.goods[symbol];
-	};
-	// are we done selling everything we can?
-	ship = dbShips.getShip(ship.symbol);
-	cargo = utils.categorizeCargo(ship.cargo, keep);
-	if (Object.keys(cargo.goods).length === 0) {
-	    return;
-	}
-	// we need to move somewhere else to sell our remaining goods
-	// first we look into markets in our system
-	const rawMarkets = await libSystems.trait({symbol: ship.nav.systemSymbol, trait: 'MARKETPLACE'});
-	// sorted by distance from where we are
-	const markets = rawMarkets.map(function (m) { return {
-	    data: m,
-	    distance: (m.x - ship.nav.route.destination.x) ** 2 + (m.y - ship.nav.route.destination.y) ** 2,
-	}});
-	markets.sort(function(a, b) {
-	    if (a.distance < b.distance) {
-		return -1;
-	    } else if (a.distance > b.distance) {
-		return 1;
-	    }
-	    return 0;
-	});
-	// check from the closest one if they import what we need to sell
-	for (let i = 0; i < markets.length; i++) {
-	    const waypointSymbol = markets[i].data.symbol;
-	    const market = await libSystems.market(waypointSymbol);
-	    // if we have no data on the market we need to go there and see
-	    // and if we have data and can sell there we need to go too
-	    if (market === null || whatCanBeTradedAt(cargo.goods, market.imports).length > 0) {
-		await libShips.navigate({symbol: ship.symbol, waypoint: waypointSymbol});
-		continue outer;
-	    }
-	}
-	// check from the closest one if they exchange what we need to sell
-	for (let i = 0; i < markets.length; i++) {
-	    const waypointSymbol = markets[i].data.symbol;
-	    const market = await libSystems.market(waypointSymbol);
-	    // if we can sell there we need to go
-	    if (whatCanBeTradedAt(cargo.goods, market.exchange).length > 0) {
-		await libShips.navigate({symbol: ship.symbol, waypoint: waypointSymbol});
-		continue outer;
-	    }
-	}
-	throw new Error(`Ship {ship.symbol} has found no importing or exchanging market for its cargo in the system`);
+		// first lets see what we want to sell
+		let cargo = utils.categorizeCargo(ship.cargo, keep);
+		// get the marketdata from our location
+		const market = await libSystems.market(ship.nav.waypointSymbol);
+		// can we sell anything here?
+		const goods = whatCanBeTradedAt(cargo.goods, market.imports.concat(market.exchange));
+		for (let i = 0; i < goods.length; i++) {
+			const symbol = goods[i].symbol;
+			await libShips.sell({
+				good: symbol,
+				symbol: ship.symbol,
+				units: cargo.goods[symbol],
+			});
+			delete cargo.goods[symbol];
+		};
+		// are we done selling everything we can?
+		ship = dbShips.getShip(ship.symbol);
+		cargo = utils.categorizeCargo(ship.cargo, keep);
+		if (Object.keys(cargo.goods).length === 0) {
+			return;
+		}
+		// we need to move somewhere else to sell our remaining goods
+		// first we look into markets in our system
+		const rawMarkets = await libSystems.trait({symbol: ship.nav.systemSymbol, trait: 'MARKETPLACE'});
+		// sorted by distance from where we are
+		const markets = rawMarkets.map(function (m) { return {
+			data: m,
+			distance: (m.x - ship.nav.route.destination.x) ** 2 + (m.y - ship.nav.route.destination.y) ** 2,
+		}});
+		markets.sort(function(a, b) {
+			if (a.distance < b.distance) {
+				return -1;
+			} else if (a.distance > b.distance) {
+				return 1;
+			}
+			return 0;
+		});
+		// check from the closest one if they import what we need to sell
+		for (let i = 0; i < markets.length; i++) {
+			const waypointSymbol = markets[i].data.symbol;
+			const market = await libSystems.market(waypointSymbol);
+			// if we have no data on the market we need to go there and see
+			// and if we have data and can sell there we need to go too
+			if (market === null || whatCanBeTradedAt(cargo.goods, market.imports).length > 0) {
+				await libShips.navigate({symbol: ship.symbol, waypoint: waypointSymbol});
+				continue outer;
+			}
+		}
+		// check from the closest one if they exchange what we need to sell
+		for (let i = 0; i < markets.length; i++) {
+			const waypointSymbol = markets[i].data.symbol;
+			const market = await libSystems.market(waypointSymbol);
+			// if we can sell there we need to go
+			if (whatCanBeTradedAt(cargo.goods, market.exchange).length > 0) {
+				await libShips.navigate({symbol: ship.symbol, waypoint: waypointSymbol});
+				continue outer;
+			}
+		}
+		throw new Error(`Ship {ship.symbol} has found no importing or exchanging market for its cargo in the system`);
     }
 }
 
diff --git a/nodejs/database/agents.js b/nodejs/database/agents.js
deleted file mode 100644
index 8b7203b..0000000
--- a/nodejs/database/agents.js
+++ /dev/null
@@ -1,21 +0,0 @@
-import db from './db.js';
-
-const addAgentStatement = db.prepare(`INSERT INTO agents(data) VALUES (json(?));`);
-const getAgentStatement = db.prepare(`SELECT data FROM agents;`);
-const setAgentStatement = db.prepare(`UPDATE agents SET data = json(?);`);
-
-export function addAgent(agent) {
-	return addAgentStatement.run(JSON.stringify(agent)).lastInsertRowid;
-}
-
-export function getAgent() {
-	const data = getAgentStatement.get();
-	if (data === undefined) {
-		return null;
-	}
-	return JSON.parse(data.data);
-}
-
-export function setAgent(agent) {
-	return setAgentStatement.run(JSON.stringify(agent)).changes;
-}
diff --git a/nodejs/database/agents.ts b/nodejs/database/agents.ts
new file mode 100644
index 0000000..41b956a
--- /dev/null
+++ b/nodejs/database/agents.ts
@@ -0,0 +1,20 @@
+import { Agent } from '../model/agent.ts';
+import db from './db.js';
+
+const addAgentStatement = db.prepare(`INSERT INTO agents(data) VALUES (json(?));`);
+const getAgentStatement = db.prepare(`SELECT data FROM agents;`);
+const setAgentStatement = db.prepare(`UPDATE agents SET data = json(?);`);
+
+export function addAgent(agent: Agent) {
+	addAgentStatement.run(JSON.stringify(agent));
+}
+
+export function getAgent(): Agent|null {
+	const data = getAgentStatement.get() as {data: string}|undefined;
+	if (!data) return null;
+	return JSON.parse(data.data);
+}
+
+export function setAgent(agent: Agent) {
+	setAgentStatement.run(JSON.stringify(agent));
+}
diff --git a/nodejs/database/contracts.js b/nodejs/database/contracts.ts
index d7f9aab..576f8dd 100644
--- a/nodejs/database/contracts.js
+++ b/nodejs/database/contracts.ts
@@ -1,30 +1,29 @@
-import db from './db.js';
+import { Contract } from '../model/contract.ts';
+import db from './db.ts';
 
 const addContractStatement = db.prepare(`INSERT INTO contracts(data) VALUES (json(?));`);
 const getContractStatement = db.prepare(`SELECT data FROM contracts WHERE data->>'id' = ?;`);
 const getContractsStatement = db.prepare(`SELECT data FROM contracts WHERE data->>'fulfilled' = false;`);
 const updateContractStatement = db.prepare(`UPDATE contracts SET data = json(:data) WHERE data->>'id' = :id;`);
 
-export function getContract(id) {
-	const data = getContractStatement.get(id);
-	if (data === undefined) {
-		return null;
-	}
+export function getContract(id: string): Contract|null {
+	const data = getContractStatement.get(id) as {data: string}|undefined;
+	if (!data) return null;
 	return JSON.parse(data.data);
 }
 
-export function getContracts() {
-	const data = getContractsStatement.all();
+export function getContracts(): Array<Contract> {
+	const data = getContractsStatement.all() as Array<{data: string}>;
 	return data.map(contractData => JSON.parse(contractData.data));
 }
 
-export function setContract(data) {
+export function setContract(data: Contract) {
 	if (getContract(data.id) === null) {
-		return addContractStatement.run(JSON.stringify(data)).lastInsertRowid;
+		addContractStatement.run(JSON.stringify(data));
 	} else {
-		return updateContractStatement.run({
+		updateContractStatement.run({
 			data: JSON.stringify(data),
 			id: data.id,
-		}).changes;
+		});
 	}
 }
diff --git a/nodejs/database/db.js b/nodejs/database/db.ts
index 4438fec..247ee5a 100644
--- a/nodejs/database/db.js
+++ b/nodejs/database/db.ts
@@ -11,7 +11,7 @@ const allMigrations = [
 
 const db = new Database(
 	process.env.NODE_ENV === 'test' ? 'test.db' : 'spacetraders.db',
-	process.env.NODE_ENV === 'development' ? { verbose: console.log } : null
+	process.env.NODE_ENV === 'development' ? { verbose: console.log } : undefined
 );
 db.pragma('foreign_keys = ON');
 db.pragma('journal_mode = WAL');
@@ -20,7 +20,8 @@ function init() {
 	db.transaction(function migrate() {
 		let version;
 		try {
-			version = db.prepare('SELECT version FROM schema_version').get().version;
+			const res = db.prepare('SELECT version FROM schema_version').get() as {version: number};
+			version = res.version;
 		} catch {
 			version = 0;
 		}
@@ -34,10 +35,10 @@ function init() {
 }
 
 export function reset() {
-	const indices = db.prepare(`SELECT name FROM sqlite_master WHERE type = 'index';`).all();
-	const tables = db.prepare(`SELECT name FROM sqlite_master WHERE type = 'table';`).all();
-	const triggers = db.prepare(`SELECT name FROM sqlite_master WHERE type = 'trigger';`).all();
-	const views = db.prepare(`SELECT name FROM sqlite_master WHERE type = 'view';`).all();
+	const indices = db.prepare(`SELECT name FROM sqlite_master WHERE type = 'index';`).all() as Array<{name: string}>;
+	const tables = db.prepare(`SELECT name FROM sqlite_master WHERE type = 'table';`).all() as Array<{name: string}>;
+	const triggers = db.prepare(`SELECT name FROM sqlite_master WHERE type = 'trigger';`).all() as Array<{name: string}>;
+	const views = db.prepare(`SELECT name FROM sqlite_master WHERE type = 'view';`).all() as Array<{name: string}>;
 	indices.forEach(elt => db.exec(`DROP INDEX ${elt.name};`));
 	tables.forEach(elt => db.exec(`DROP TABLE ${elt.name};`));
 	triggers.forEach(elt => db.exec(`DROP TRIGGER ${elt.name};`));
diff --git a/nodejs/database/ships.js b/nodejs/database/ships.ts
index f9eb668..58c8abf 100644
--- a/nodejs/database/ships.js
+++ b/nodejs/database/ships.ts
@@ -1,4 +1,6 @@
-import db from './db.js';
+import db from './db.ts';
+import { Cargo } from '../model/cargo.ts';
+import { Fuel, Nav, Ship } from '../model/ship.ts';
 
 const addShipStatement = db.prepare(`INSERT INTO ships(data) VALUES (json(?));`);
 const getShipStatement = db.prepare(`SELECT data FROM ships WHERE data->>'symbol' = ?;`);
@@ -8,51 +10,46 @@ const setShipFuelStatement = db.prepare(`UPDATE ships SET data = (SELECT json_se
 const setShipNavStatement = db.prepare(`UPDATE ships SET data = (SELECT json_set(data, '$.nav', json(:nav)) FROM ships WHERE data->>'symbol' = :symbol) WHERE data->>'symbol' = :symbol;`);
 const updateShipStatement = db.prepare(`UPDATE ships SET data = json(:data) WHERE data->>'symbol' = :symbol;`);
 
-export function getShip(symbol) {
-	const data = getShipStatement.get(symbol);
-	if (data === undefined) {
-		return null;
-	}
+export function getShip(symbol: string): Ship|null {
+	const data = getShipStatement.get(symbol) as {data: string}|undefined;
+	if (!data) return null;
 	return JSON.parse(data.data);
 }
 
-export function getShipsAt(symbol) {
-	const data = getShipsAtStatement.all(symbol);
-	if (data === undefined) {
-		return null;
-	}
+export function getShipsAt(symbol: string) {
+	const data = getShipsAtStatement.all(symbol) as Array<{data: string}>;
 	return data.map(elt => JSON.parse(elt.data));
 }
 
 
-export function setShip(data) {
+export function setShip(data: Ship) {
 	if (getShip(data.symbol) === null) {
-		return addShipStatement.run(JSON.stringify(data)).lastInsertRowid;
+		addShipStatement.run(JSON.stringify(data));
 	} else {
-		return updateShipStatement.run({
+		updateShipStatement.run({
 			data: JSON.stringify(data),
 			symbol: data.symbol,
-		}).changes;
+		});
 	}
 }
 
-export function setShipCargo(symbol, cargo) {
-	return setShipCargoStatement.run({
+export function setShipCargo(symbol: string, cargo: Cargo) {
+	setShipCargoStatement.run({
 		cargo: JSON.stringify(cargo),
 		symbol: symbol,
-	}).changes;
+	});
 }
 
-export function setShipFuel(symbol, fuel) {
-	return setShipFuelStatement.run({
+export function setShipFuel(symbol: string, fuel: Fuel) {
+	setShipFuelStatement.run({
 		fuel: JSON.stringify(fuel),
 		symbol: symbol,
-	}).changes;
+	});
 }
 
-export function setShipNav(symbol, nav) {
-	return setShipNavStatement.run({
+export function setShipNav(symbol: string, nav: Nav) {
+	setShipNavStatement.run({
 		nav: JSON.stringify(nav),
 		symbol: symbol,
-	}).changes;
+	});
 }
diff --git a/nodejs/database/tokens.js b/nodejs/database/tokens.js
deleted file mode 100644
index 2a781af..0000000
--- a/nodejs/database/tokens.js
+++ /dev/null
@@ -1,16 +0,0 @@
-import db from './db.js';
-
-const addTokenStatement = db.prepare(`INSERT INTO tokens(data) VALUES (?);`);
-const getTokenStatement = db.prepare(`SELECT data FROM tokens;`);
-
-export function addToken(token) {
-	return addTokenStatement.run(token).lastInsertRowid;
-}
-
-export function getToken() {
-	const data = getTokenStatement.get();
-	if (data === undefined) {
-		return null;
-	}
-	return data.data;
-}
diff --git a/nodejs/database/tokens.ts b/nodejs/database/tokens.ts
new file mode 100644
index 0000000..4495a65
--- /dev/null
+++ b/nodejs/database/tokens.ts
@@ -0,0 +1,14 @@
+import db from './db.ts';
+
+const addTokenStatement = db.prepare(`INSERT INTO tokens(data) VALUES (?);`);
+const getTokenStatement = db.prepare(`SELECT data FROM tokens;`);
+
+export function addToken(token: string) {
+	addTokenStatement.run(token);
+}
+
+export function getToken(): string|null {
+	const data = getTokenStatement.get() as {data: string}|undefined;
+	if (data === undefined) return null;
+	return data.data;
+}
diff --git a/nodejs/lib/api.js b/nodejs/lib/api.ts
index ecb0282..08c6c71 100644
--- a/nodejs/lib/api.js
+++ b/nodejs/lib/api.ts
@@ -1,8 +1,9 @@
 import * as fs from 'fs';
 import * as events from 'events';
 
-import { getToken } from '../database/tokens.js';
-import { PriorityQueue } from './priority_queue.js';
+import { APIError, Request, RequestPromise, Response } from '../model/api.ts';
+import { getToken } from '../database/tokens.ts';
+import { PriorityQueue } from './priority_queue.ts';
 
 // queue processor module variables
 const bus = new events.EventEmitter(); // a bus to notify the queue processor to start processing messages
@@ -10,10 +11,9 @@ let busy = false; // true if we are already sending api requests.
 let backoffSeconds = 0;
 let running = false;
 // other module variables
-let headers = undefined; // a file scoped variable so that we only evaluate these once.
+let headers: {[key:string]:string}|null = null; // a file scoped variable so that we only evaluate these once.
 let queue = new PriorityQueue(); // a priority queue to hold api calls we want to send, allows for throttling.
 
-// a single queue processor should be running at any time, otherwise there will be trouble!
 async function queue_processor() {
 	if (running) {
 		throw 'refusing to start a second queue processor';
@@ -30,9 +30,10 @@ async function queue_processor() {
 				await new Promise(resolve => bus.once('send', resolve));
 				busy = true;
 			}
-			const before = new Date();
-			await send_this(queue.dequeue().element);
-			const duration = new Date() - before;
+			const before = new Date().getTime();
+			const data = queue.dequeue() as RequestPromise<unknown>;
+			await send_this(data);
+			const duration = new Date().getTime() - before;
 			if (duration < 400) { // 333 should work, but 400 should still allow some manual requests to go through during development
 				await sleep(400 - duration);
 			}
@@ -44,21 +45,17 @@ async function queue_processor() {
 }
 queue_processor();
 
-// send takes a request object as argument and an optional context ctx
-// example request: {
-//    endpoint: the path part of the url to call,
-//    method: HTTP method for `fetch` call, defaults to 'GET',
-//    page: run a paginated request starting from this page until all the following pages are fetched
-//    payload: optional json object that will be send along with the request,
-//    priority: optional priority value (defaults to 10, lower than 10 means the message will be sent faster)
-// }
-export async function send(request, ctx) {
-	if (request.page === undefined) {
-		return await send_one(request, ctx);
-	}
-	let ret = [];
+export async function send<T>(request: Request): Promise<T|APIError> {
+	const response = await send_one<T>(request);
+	if (response.error) return response.error;
+	return response.data;
+}
+
+export async function sendPaginated<T>(request: Request): Promise<Array<T>|APIError> {
+	if (request.page === undefined) request.page = 1;
+	let ret: Array<T> = [];
 	while (true) {
-		const response = await send_one(request, ctx);
+		const response = await send_one<T>(request);
 		if (response.meta === undefined) {
 			throw {"message": "paginated request did not return a meta block", "request": request, "response": response};
 		}
@@ -70,10 +67,9 @@ export async function send(request, ctx) {
 	}
 }
 
-function send_one(request, ctx) {
+function send_one<T>(request: Request): Promise<Response<T>> {
 	return new Promise((resolve, reject) => {
-		let data = {
-			ctx: ctx,
+		const data: RequestPromise<T> = {
 			reject: reject,
 			request: request,
 			resolve: resolve,
@@ -86,8 +82,8 @@ function send_one(request, ctx) {
 }
 
 // send_this take a data object as argument built in the send function above
-async function send_this(data) {
-	if (headers === undefined) {
+async function send_this(data: RequestPromise<unknown>) {
+	if (headers === null) {
 		const token = getToken();
 		if (token === null) {
 			throw 'Could not get token from the database. Did you init or register yet?';
@@ -97,7 +93,7 @@ async function send_this(data) {
 			'Authorization': `Bearer ${token}`
 		};
 	}
-	let options = {
+	let options: {[key:string]:any} = {
 		headers: headers,
 	};
 	if (data.request.method !== undefined) {
@@ -112,52 +108,53 @@ async function send_this(data) {
 	}
 	fs.writeFileSync('log', JSON.stringify({event: 'send', date: new Date(), data: data}) + '\n', {flag: 'a+'});
 	try {
-		let response = await fetch(`https://api.spacetraders.io/v2${data.request.endpoint}${pagination}`, options);
-		response = await response.json();
-		switch(response.error?.code) {
-		case 401: // TODO 401 means a server reset happened
-			throw response;
-			// TODO reject all promises in queue
-			// reset database
-			// logrotate
-			// spawnSync?
-			// break;
-		case 429:  // 429 means rate limited, let's hold back as instructed
-			backoffSeconds = response.error.data.retryAfter;
-			queue.enqueue(data, 1);
-			break;
-		case 503:  // 503 means maintenance mode, let's hold back for 1 minute
-			backoffSeconds = 60;
-			queue.enqueue(data, 1);
-			break;
-		default: // no error!
-			fs.writeFileSync('log', JSON.stringify({event: 'response', date: new Date(), data: response}) + '\n', {flag: 'a+'});
-			return data.resolve(response);
+		const response = await fetch(`https://api.spacetraders.io/v2${data.request.endpoint}${pagination}`, options);
+		const json = await response.json() as Response<unknown>;
+		switch(json.error?.code) {
+			case 401: // TODO 401 means a server reset happened
+				throw json;
+				// TODO reject all promises in queue
+				// reset database
+				// logrotate
+				// spawnSync?
+				// break;
+			case 429:  // 429 means rate limited, let's hold back as instructed
+				backoffSeconds = json.error.data.retryAfter;
+				queue.enqueue(data, 1);
+				break;
+			case 503:  // 503 means maintenance mode, let's hold back for 1 minute
+				backoffSeconds = 60;
+				queue.enqueue(data, 1);
+				break;
+			default: // no error!
+				fs.writeFileSync('log', JSON.stringify({event: 'response', date: new Date(), data: json}) + '\n', {flag: 'a+'});
+				return data.resolve(json);
 		}
-	} catch (err) {
+	} catch (_err) {
+		const err = _err as {cause?: {code: string}};
 		fs.writeFileSync('log', JSON.stringify({event: 'error', date: new Date(), data: err}) + '\n', {flag: 'a+'});
 		switch(err.cause?.code) {
-		case 'EAI_AGAIN': // DNS lookup timed out error, let's hold back for 5 seconds
-			backoffSeconds = 5;
-			queue.enqueue(data, 1);
-			break;
-		case 'ECONNRESET':
-			queue.enqueue(data, 1);
-			break;
-		case 'UND_ERR_CONNECT_TIMEOUT':
-			queue.enqueue(data, 1);
-			break;
-		default:
-			data.reject(err);
+			case 'EAI_AGAIN': // DNS lookup timed out error, let's hold back for 5 seconds
+				backoffSeconds = 5;
+				queue.enqueue(data, 1);
+				break;
+			case 'ECONNRESET':
+				queue.enqueue(data, 1);
+				break;
+			case 'UND_ERR_CONNECT_TIMEOUT':
+				queue.enqueue(data, 1);
+				break;
+			default:
+				data.reject(err);
 		}
 	}
 }
 
-export function debugLog(ctx) {
+export function debugLog(ctx: any) {
 	console.log(`--- ${Date()} -----------------------------------------------------------------------------`);
 	console.log(JSON.stringify(ctx, null, 2));
 }
 
-export function sleep(delay) {
-	return new Promise((resolve) => setTimeout(resolve, delay))
+export function sleep(delay: number): Promise<unknown> {
+	return new Promise((resolve) => setTimeout(resolve, delay));
 }
diff --git a/nodejs/lib/contracts.js b/nodejs/lib/contracts.js
deleted file mode 100644
index 9718f99..0000000
--- a/nodejs/lib/contracts.js
+++ /dev/null
@@ -1,68 +0,0 @@
-import * as dbAgents from '../database/agents.js';
-import * as dbContracts from '../database/contracts.js';
-import * as api from './api.js';
-import * as dbShips from '../database/ships.js';
-import * as libShips from '../lib/ships.js';
-
-export async function accept(ctx) {
-	const contract = dbContracts.getContract(ctx.id);
-	if (contract.accepted) {
-		return;
-	}
-	await api.send({endpoint: `/my/contracts/${ctx.id}/accept`, method: 'POST'});
-	contract.accepted = true;
-	dbContracts.setContract(contract);
-}
-
-export async function contracts() {
-	const contracts = await api.send({endpoint: '/my/contracts', page: 1});
-	contracts.forEach(contract => dbContracts.setContract(contract));
-	return contracts;
-}
-
-// returns true if the contract has been fulfilled
-export async function deliver(ctx) {
-	const contract = dbContracts.getContract(ctx.id);
-	if (contract.terms.deliver[0].unitsRequired === contract.terms.deliver[0].unitsFulfilled) {
-		await fulfill(ctx);
-		return true;
-	}
-	await libShips.dock(ctx);
-	const response = await api.send({ endpoint: `/my/contracts/${ctx.id}/deliver`, method: 'POST', payload: {
-		shipSymbol: ctx.symbol,
-		tradeSymbol: ctx.good,
-		units: ctx.units,
-	}});
-	if (response.error !== undefined) {
-		switch(response.error.code) {
-		case 4509: // contract delivery terms have been met
-			await fulfill(ctx);
-			return true;
-		default: // yet unhandled error
-			api.debugLog(response);
-			throw response;
-		}
-	}
-	dbContracts.setContract(response.data.contract);
-	dbShips.setShipCargo(ctx.symbol, response.data.cargo);
-	// TODO track credits
-	if(response.data.contract.terms.deliver[0].unitsRequired === response.data.contract.terms.deliver[0].unitsFulfilled) {
-		await fulfill(ctx);
-		return true;
-	}
-	return false;
-}
-
-export async function fulfill(ctx) {
-	const contract = dbContracts.getContract(ctx.id);
-	if (contract.fulfilled) {
-		return;
-	}
-	const response = await api.send({ endpoint: `/my/contracts/${ctx.id}/fulfill`, method: 'POST'});
-	if (response.error !== undefined) {
-		api.debugLog(response);
-		throw response;
-	}
-	dbAgents.setAgent(response.data.agent);
-	dbContracts.setContract(response.data.contract);
-}
diff --git a/nodejs/lib/contracts.ts b/nodejs/lib/contracts.ts
new file mode 100644
index 0000000..fb62813
--- /dev/null
+++ b/nodejs/lib/contracts.ts
@@ -0,0 +1,74 @@
+import { Agent } from '../model/agent.ts';
+import { APIError } from '../model/api.ts';
+import { Cargo } from '../model/cargo.ts';
+import { Contract } from '../model/contract.ts';
+import { Ship } from '../model/ship.ts';
+import * as dbAgents from '../database/agents.ts';
+import * as dbContracts from '../database/contracts.ts';
+import * as api from './api.ts';
+import * as dbShips from '../database/ships.ts';
+import * as libShips from '../lib/ships.ts';
+
+export async function accept(contract: Contract): Promise<Contract> {
+	if (contract.accepted) return contract;
+	const response = await api.send<{agent: Agent, contract: Contract, type: ''}>({endpoint: `/my/contracts/${contract.id}/accept`, method: 'POST'});
+	if ('apiError' in response) {
+		api.debugLog(response);
+		throw response;
+	}
+	dbAgents.setAgent(response.agent);
+	dbContracts.setContract(response.contract);
+	return response.contract;
+}
+
+export async function contracts(): Promise<Array<Contract>> {
+	const response = await api.sendPaginated<Contract>({endpoint: '/my/contracts', page: 1});
+	if ('apiError' in response) {
+		api.debugLog(response);
+		throw response;
+	}
+	response.forEach(contract => dbContracts.setContract(contract));
+	return response;
+}
+
+export async function deliver(contract: Contract, ship: Ship): Promise<Contract> {
+	if (contract.terms.deliver[0].unitsRequired >= contract.terms.deliver[0].unitsFulfilled) {
+		return await fulfill(contract);
+	}
+	const tradeSymbol = contract.terms.deliver[0].tradeSymbol;
+	let units = 0;
+	ship.cargo.inventory.forEach(i => {if (i.symbol === tradeSymbol) units = i.units; });
+	ship = await libShips.dock(ship); // we need to be docked to deliver
+	const response = await api.send<{contract: Contract, cargo: Cargo}>({ endpoint: `/my/contracts/${contract.id}/deliver`, method: 'POST', payload: {
+		shipSymbol: ship.symbol,
+		tradeSymbol: tradeSymbol,
+		units: units,
+	}});
+	if ('apiError' in response) {
+		switch(response.code) {
+			case 4509: // contract delivery terms have been met
+				return await fulfill(contract);
+			default: // yet unhandled error
+				api.debugLog(response);
+				throw response;
+		}
+	}
+	dbContracts.setContract(response.contract);
+	dbShips.setShipCargo(ship.symbol, response.cargo);
+	if(response.contract.terms.deliver[0].unitsRequired >= response.contract.terms.deliver[0].unitsFulfilled) {
+		return await fulfill(contract);
+	}
+	return response.contract;
+}
+
+export async function fulfill(contract: Contract): Promise<Contract> {
+	if (contract.fulfilled) return contract;
+	const response = await api.send<{agent: Agent, contract: Contract}>({ endpoint: `/my/contracts/${contract.id}/fulfill`, method: 'POST'});
+	if ('apiError' in response) {
+		api.debugLog(response);
+		throw response;
+	}
+	dbAgents.setAgent(response.agent);
+	dbContracts.setContract(response.contract);
+	return response.contract;
+}
diff --git a/nodejs/lib/priority_queue.js b/nodejs/lib/priority_queue.js
deleted file mode 100644
index da526b2..0000000
--- a/nodejs/lib/priority_queue.js
+++ /dev/null
@@ -1,39 +0,0 @@
-export class QElement {
-	constructor(element, priority) {
-		this.element = element;
-		this.priority = priority;
-	}
-}
-
-export class PriorityQueue {
-	constructor(elt) {
-		this.items = [];
-		if (elt !== undefined) {
-			this.enqueue(elt, 0);
-		}
-	}
-
-	enqueue(element, priority) {
-		let qElement = new QElement(element, priority);
-
-		for (let i = 0; i < this.items.length; ++i) {
-			if (this.items[i].priority > qElement.priority) {
-				this.items.splice(i, 0, qElement);
-				return;
-			}
-		}
-		this.items.push(qElement);
-	}
-	dequeue() {
-		return this.items.shift(); // we would use pop to get the highest priority, shift() gives us the lowest priority
-	}
-	front() {
-		return this.items[0];
-	}
-	rear() {
-		return this.items[this.items.length - 1];
-	}
-	isEmpty() {
-		return this.items.length === 0;
-	}
-}
diff --git a/nodejs/lib/priority_queue.ts b/nodejs/lib/priority_queue.ts
new file mode 100644
index 0000000..ec9e7d0
--- /dev/null
+++ b/nodejs/lib/priority_queue.ts
@@ -0,0 +1,36 @@
+class QElement {
+	element: unknown;
+	priority: number;
+	constructor(element: unknown, priority: number) {
+		this.element = element;
+		this.priority = priority;
+	}
+}
+
+export class PriorityQueue {
+	items: Array<QElement>;
+
+	constructor(elt?: unknown) {
+		this.items = [];
+		if (elt !== undefined) this.enqueue(elt, 0);
+	}
+
+	enqueue(element: unknown, priority: number): void {
+		let qElement = new QElement(element, priority);
+
+		for (let i = 0; i < this.items.length; ++i) {
+			if (this.items[i].priority > qElement.priority) {
+				this.items.splice(i, 0, qElement);
+				return;
+			}
+		}
+		this.items.push(qElement);
+	}
+	dequeue(): unknown {
+		// we would use pop to get the highest priority, shift() gives us the lowest priority
+		return this.items.shift()?.element;
+	}
+	isEmpty(): boolean {
+		return this.items.length === 0;
+	}
+}
diff --git a/nodejs/lib/ships.js b/nodejs/lib/ships.js
deleted file mode 100644
index 835e62b..0000000
--- a/nodejs/lib/ships.js
+++ /dev/null
@@ -1,195 +0,0 @@
-import * as api from './api.js';
-import * as dbShips from '../database/ships.js';
-import * as dbSurveys from '../database/surveys.js';
-import * as systems from '../lib/systems.js';
-
-export async function extract(ctx) {
-	const ship = dbShips.getShip(ctx.symbol);
-	const asteroidFields = await systems.type({symbol: ship.nav.systemSymbol, type: 'ENGINEERED_ASTEROID'});
-	// TODO if there are multiple fields, find the closest one?
-	await navigate({symbol: ctx.symbol, waypoint: asteroidFields[0].symbol});
-	await orbit(ctx);
-	// TODO handle surveying?
-	const response = await api.send({endpoint: `/my/ships/${ctx.symbol}/extract`, method: 'POST'});
-	if (response.error !== undefined) {
-		switch(response.error.code) {
-		case 4000: // ship is on cooldown
-			await api.sleep(response.error.data.cooldown.remainingSeconds  * 1000);
-			return await extract(ctx);
-		case 4228: // ship is full
-			return null;
-		default: // yet unhandled error
-			throw response;
-		}
-	} else {
-		dbShips.setShipCargo(ctx.symbol, response.data.cargo);
-		await api.sleep(response.data.cooldown.remainingSeconds*1000);
-	}
-	return response;
-}
-
-export async function dock(ctx) {
-	const ship = dbShips.getShip(ctx.symbol);
-	if (ship.nav.status === 'DOCKED') {
-		return null;
-	}
-	const response = await api.send({endpoint: `/my/ships/${ctx.symbol}/dock`, method: 'POST'});
-	if (response.error !== undefined) {
-		switch(response.error.code) {
-		case 4214: // ship is in transit
-			await api.sleep(response.error.data.secondsToArrival  * 1000);
-			return await dock(ctx);
-		default: // yet unhandled error
-			throw response;
-		}
-	}
-	dbShips.setShipNav(ctx.symbol, response.data.nav);
-	return response;
-}
-
-function hasMount(shipSymbol, mountSymbol) {
-	const ship = dbShips.getShip(shipSymbol);
-	return ship.mounts.filter(s => s.symbol === mountSymbol).length > 0;
-}
-
-export async function jump(ctx) {
-	// TODO
-	const response = await api.send({endpoint: `/my/ships/${ctx.ship}/jump`, method: 'POST', payload: { systemSymbol: ctx.system }});
-	await api.sleep(response.data.cooldown.remainingSeconds*1000);
-	return response;
-}
-
-export async function navigate(ctx) {
-	const ship = dbShips.getShip(ctx.symbol);
-	if (ship.nav.waypointSymbol === ctx.waypoint) {
-		return;
-	}
-	await orbit(ctx);
-	// TODO if we do not have enough fuel, make a stop to refuel along the way or drift to the destination
-	const response = await api.send({endpoint: `/my/ships/${ctx.symbol}/navigate`, method: 'POST', payload: { waypointSymbol: ctx.waypoint }});
-	if (response.error !== undefined) {
-		switch(response.error.code) {
-		case 4214: // ship is in transit
-			await api.sleep(response.error.data.secondsToArrival  * 1000);
-			return await navigate(ctx);
-		default: // yet unhandled error
-			throw response;
-		}
-	}
-	dbShips.setShipFuel(ctx.symbol, response.data.fuel);
-	dbShips.setShipNav(ctx.symbol, response.data.nav);
-	const delay = new Date(response.data.nav.route.arrival) - new Date();
-	await api.sleep(delay);
-	response.data.nav.status = 'IN_ORBIT';
-	dbShips.setShipNav(ctx.symbol, response.data.nav);
-	await refuel(ctx);
-	return response;
-}
-
-export async function negotiate(ctx) {
-	// TODO
-	return await api.send({endpoint: `/my/ships/${ctx.ship}/negotiate/contract`, method: 'POST'});
-}
-
-export async function orbit(ctx) {
-	const ship = dbShips.getShip(ctx.symbol);
-	if (ship.nav.status === 'IN_ORBIT') {
-		return null;
-	}
-	const response = await api.send({endpoint: `/my/ships/${ctx.symbol}/orbit`, method: 'POST'});
-	if (response.error !== undefined) {
-		switch(response.error.code) {
-		case 4214: // ship is in transit
-			await api.sleep(response.error.data.secondsToArrival  * 1000);
-			return await orbit(ctx);
-		default: // yet unhandled error
-			throw response;
-		}
-	}
-	dbShips.setShipNav(ctx.symbol, response.data.nav);
-	return response;
-}
-
-export async function purchase(ctx) {
-	const response = await api.send({endpoint: '/my/ships', method: 'POST', payload: {
-		shipType: ctx.shipType,
-		waypointSymbol: ctx.waypoint,
-	}});
-	if (response.error !== undefined) {
-		throw response;
-	}
-	dbShips.setShip(response.data.ship);
-	return response.data;
-}
-
-export async function refuel(ctx) {
-	const ship = dbShips.getShip(ctx.symbol);
-	if (ship.fuel.current >= ship.fuel.capacity * 0.9) {
-		return null;
-	}
-	// TODO check if our current waypoint has a marketplace (and sells fuel)?
-	await dock(ctx);
-	const response = await api.send({endpoint: `/my/ships/${ctx.symbol}/refuel`, method: 'POST'});
-	if (response.error !== undefined) {
-		throw response;
-	}
-	dbShips.setShipFuel(ctx.symbol, response.data.fuel);
-	// TODO track credits
-	return response;
-}
-
-export async function sell(ctx) {
-	// TODO check if our current waypoint has a marketplace?
-	await dock(ctx);
-	const ship = dbShips.getShip(ctx.symbol);
-	const response = await api.send({endpoint: `/my/ships/${ctx.symbol}/sell`, method: 'POST', payload: { symbol: ctx.good, units: ctx.units }});
-	if (response.error !== undefined) {
-		throw response;
-	}
-	dbShips.setShipCargo(ctx.symbol, response.data.cargo);
-	// TODO track credits
-	return response;
-}
-
-export async function ships() {
-	const response = await api.send({endpoint: `/my/ships`, page: 1});
-	if (response.error !== undefined) {
-		throw response;
-	}
-	response.forEach(ship => dbShips.setShip(ship));
-	return response;
-}
-
-export async function ship(ctx) {
-	const response = await api.send({endpoint: `/my/ships/${ctx.symbol}`});
-	if (response.error !== undefined) {
-		throw response;
-	}
-	dbShips.setShip(response.data);
-	return response;
-}
-
-export async function survey(ctx) {
-	if (!hasMount(ctx.symbol, 'MOUNT_SURVEYOR_I')) { // we check if a surveyor is mounted on the ship
-		return null;
-	}
-	const ship = dbShips.getShip(ctx.symbol);
-	const asteroidFields = await systems.type({symbol: ship.nav.systemSymbol, type: 'ASTEROID_FIELD'});
-	// TODO if there are multiple fields, find the closest one?
-	await navigate({symbol: ctx.symbol, waypoint: asteroidFields[0].symbol});
-	await orbit(ctx);
-	const response = await api.send({endpoint: `/my/ships/${ctx.symbol}/survey`, method: 'POST'});
-	api.debugLog(response);
-	if (response.error !== undefined) {
-		switch(response.error.code) {
-		case 4000: // ship is on cooldown
-			await api.sleep(response.error.data.cooldown.remainingSeconds  * 1000);
-			return await survey(ctx);
-		default: // yet unhandled error
-			throw response;
-		}
-	}
-	dbSurveys.set(response.data.surveys[0]);
-	await api.sleep(response.data.cooldown.remainingSeconds*1000);
-	return response;
-}
diff --git a/nodejs/lib/ships.ts b/nodejs/lib/ships.ts
new file mode 100644
index 0000000..2e04dd4
--- /dev/null
+++ b/nodejs/lib/ships.ts
@@ -0,0 +1,204 @@
+import { Response } from '../model/api.ts';
+import { Agent } from '../model/agent.ts';
+import { Cargo } from '../model/cargo.ts';
+import { Cooldown, Fuel, Nav, Ship } from '../model/ship.ts';
+import * as api from './api.js';
+import * as dbAgents from '../database/agents.ts';
+import * as dbShips from '../database/ships.js';
+import * as dbSurveys from '../database/surveys.js';
+import * as systems from '../lib/systems.js';
+
+export async function dock(ship: Ship): Promise<Ship> {
+	if (ship.nav.status === 'DOCKED') return ship;
+	const response = await api.send({endpoint: `/my/ships/${ship.symbol}/dock`, method: 'POST'}) as Response<{nav: Nav}>;
+	if (response.error !== undefined) {
+		switch(response.error.code) {
+			case 4214: // ship is in transit
+				await api.sleep(response.error.data.secondsToArrival  * 1000);
+				return await dock(ship);
+			default: // yet unhandled error
+				api.debugLog(response);
+				throw response;
+		}
+	}
+	dbShips.setShipNav(ship.symbol, response.data.nav);
+	ship.nav = response.data.nav;
+	return ship;
+}
+
+export async function extract(ship: Ship): Promise<Ship> {
+	// TODO move to a suitable asteroid?
+	// const asteroidFields = await systems.type({symbol: ship.nav.systemSymbol, type: 'ENGINEERED_ASTEROID'});
+	// TODO if there are multiple fields, find the closest one?
+	//await navigate({symbol: ctx.symbol, waypoint: asteroidFields[0].symbol});
+	ship = await orbit(ship);
+	// TODO handle surveying?
+	const response = await api.send({endpoint: `/my/ships/${ship.symbol}/extract`, method: 'POST'}) as Response<{cooldown: Cooldown, cargo: Cargo}>; // TODO extraction and events api response fields cf https://spacetraders.stoplight.io/docs/spacetraders/b3931d097608d-extract-resources
+	if (response.error !== undefined) {
+		switch(response.error.code) {
+			case 4000: // ship is on cooldown
+				await api.sleep(response.error.data.cooldown.remainingSeconds  * 1000);
+				return await extract(ship);
+			case 4228: // ship is full
+				return ship;
+			default: // yet unhandled error
+				api.debugLog(response);
+				throw response;
+		}
+	} else {
+		dbShips.setShipCargo(ship.symbol, response.data.cargo);
+		ship.cargo = response.data.cargo;
+		await api.sleep(response.data.cooldown.remainingSeconds*1000);
+	}
+	return ship;
+}
+
+//function hasMount(shipSymbol, mountSymbol) {
+//	const ship = dbShips.getShip(shipSymbol);
+//	return ship.mounts.filter(s => s.symbol === mountSymbol).length > 0;
+//}
+
+//export async function jump(ship: Ship): Ship {
+//	// TODO
+//	const response = await api.send({endpoint: `/my/ships/${ctx.ship}/jump`, method: 'POST', payload: { systemSymbol: ctx.system }});
+//	await api.sleep(response.data.cooldown.remainingSeconds*1000);
+//	return response;
+//}
+
+export async function navigate(ship: Ship, waypoint: string): Promise<Ship> {
+	if (ship.nav.waypointSymbol === waypoint) return ship;
+	ship = await orbit(ship);
+	// TODO if we do not have enough fuel, make a stop to refuel along the way or drift to the destination
+	const response = await api.send({endpoint: `/my/ships/${ship.symbol}/navigate`, method: 'POST', payload: { waypointSymbol: waypoint }}) as Response<{fuel: Fuel, nav: Nav}>; // TODO events field
+	if (response.error !== undefined) {
+		switch(response.error.code) {
+			case 4214: // ship is in transit
+				await api.sleep(response.error.data.secondsToArrival  * 1000);
+				return await navigate(ship, waypoint);
+			default: // yet unhandled error
+				api.debugLog(response);
+				throw response;
+		}
+	}
+	dbShips.setShipFuel(ship.symbol, response.data.fuel);
+	dbShips.setShipNav(ship.symbol, response.data.nav);
+	ship.fuel = response.data.fuel;
+	ship.nav = response.data.nav
+	const delay = new Date(response.data.nav.route.arrival).getTime()  - new Date().getTime() ;
+	await api.sleep(delay);
+	response.data.nav.status = 'IN_ORBIT'; // we arrive in orbit
+	dbShips.setShipNav(ship.symbol, response.data.nav);
+	ship.nav = response.data.nav
+	ship = await refuel(ship);
+	return ship;
+}
+
+//export async function negotiate(ctx) {
+//	// TODO
+//	return await api.send({endpoint: `/my/ships/${ctx.ship}/negotiate/contract`, method: 'POST'});
+//}
+
+export async function orbit(ship: Ship): Promise<Ship> {
+	if (ship.nav.status === 'IN_ORBIT') return ship;
+	const response = await api.send({endpoint: `/my/ships/${ship.symbol}/orbit`, method: 'POST'}) as Response<{nav: Nav}>;
+	if (response.error !== undefined) {
+		switch(response.error.code) {
+			case 4214: // ship is in transit
+				await api.sleep(response.error.data.secondsToArrival  * 1000);
+				return await orbit(ship);
+			default: // yet unhandled error
+				throw response;
+		}
+	}
+	dbShips.setShipNav(ship.symbol, response.data.nav);
+	ship.nav = response.data.nav;
+	return ship;
+}
+
+//export async function purchase(ctx) {
+//	const response = await api.send({endpoint: '/my/ships', method: 'POST', payload: {
+//		shipType: ctx.shipType,
+//		waypointSymbol: ctx.waypoint,
+//	}});
+//	if (response.error !== undefined) {
+//		throw response;
+//	}
+//	dbShips.setShip(response.data.ship);
+//	return response.data;
+//}
+
+export async function refuel(ship: Ship): Promise<Ship> {
+	if (ship.fuel.current >= ship.fuel.capacity * 0.9) return ship;
+	// TODO check if our current waypoint has a marketplace (and sells fuel)?
+	ship = await dock(ship);
+	const response = await api.send({endpoint: `/my/ships/${ship.symbol}/refuel`, method: 'POST'}) as Response<{agent: Agent, fuel: Fuel}>; // TODO transaction field
+	if (response.error !== undefined) {
+		api.debugLog(response);
+		throw response;
+	}
+	dbShips.setShipFuel(ship.symbol, response.data.fuel);
+	dbAgents.setAgent(response.data.agent);
+	ship.fuel = response.data.fuel;
+	return ship;
+}
+
+export async function sell(ship: Ship, tradeSymbol: string): Promise<Ship> {
+	// TODO check if our current waypoint has a marketplace?
+	ship = await dock(ship);
+	let units = 0;
+	ship.cargo.inventory.forEach(i => {if (i.symbol === tradeSymbol) units = i.units; });
+	const response = await api.send({endpoint: `/my/ships/${ship.symbol}/sell`, method: 'POST', payload: { symbol: tradeSymbol, units: units }}) as Response<{agent: Agent, cargo: Cargo}>; // TODO transaction field
+	if (response.error !== undefined) {
+		api.debugLog(response);
+		throw response;
+	}
+	dbShips.setShipCargo(ship.symbol, response.data.cargo);
+	dbAgents.setAgent(response.data.agent);
+	ship.cargo = response.data.cargo;
+	return ship;
+}
+
+export async function ships(): Promise<Array<Ship>> {
+	const response = await api.send({endpoint: `/my/ships`, page: 1}) as Response<Array<Ship>>;
+	if (response.error !== undefined) {
+		api.debugLog(response);
+		throw response;
+	}
+	response.data.forEach(ship => dbShips.setShip(ship));
+	return response.data;
+}
+
+export async function ship(ship: Ship): Promise<Ship> {
+	const response = await api.send({endpoint: `/my/ships/${ship.symbol}`}) as Response<Ship>;
+	if (response.error !== undefined) {
+		api.debugLog(response);
+		throw response;
+	}
+	dbShips.setShip(response.data);
+	return response.data;
+}
+
+//export async function survey(ctx) {
+//	if (!hasMount(ctx.symbol, 'MOUNT_SURVEYOR_I')) { // we check if a surveyor is mounted on the ship
+//		return null;
+//	}
+//	const ship = dbShips.getShip(ctx.symbol);
+//	const asteroidFields = await systems.type({symbol: ship.nav.systemSymbol, type: 'ASTEROID_FIELD'});
+//	// TODO if there are multiple fields, find the closest one?
+//	await navigate({symbol: ctx.symbol, waypoint: asteroidFields[0].symbol});
+//	await orbit(ctx);
+//	const response = await api.send({endpoint: `/my/ships/${ctx.symbol}/survey`, method: 'POST'});
+//	api.debugLog(response);
+//	if (response.error !== undefined) {
+//		switch(response.error.code) {
+//			case 4000: // ship is on cooldown
+//				await api.sleep(response.error.data.cooldown.remainingSeconds  * 1000);
+//				return await survey(ctx);
+//			default: // yet unhandled error
+//				throw response;
+//		}
+//	}
+//	dbSurveys.set(response.data.surveys[0]);
+//	await api.sleep(response.data.cooldown.remainingSeconds*1000);
+//	return response;
+//}
diff --git a/nodejs/lib/systems.js b/nodejs/lib/systems.ts
index 6993431..94ebab7 100644
--- a/nodejs/lib/systems.js
+++ b/nodejs/lib/systems.ts
@@ -5,17 +5,17 @@ import * as dbSystems from '../database/systems.js';
 import * as utils from './utils.js';
 
 // Retrieves a marketplace's market data for waypointSymbol
-export async function market(waypointSymbol) {
+export async function market(waypointSymbol: string) {
     const data = dbMarkets.getMarketAtWaypoint(waypointSymbol);
     if (data === null) {
-	if (dbShips.getShipsAt(waypointSymbol) === null) {
-	    return null;
-	}
-	const systemSymbol = utils.systemFromWaypoint(waypointSymbol);
-	let d = await api.send({endpoint: `/systems/${systemSymbol}/waypoints/${waypointSymbol}/market`});
-	delete d.data.transactions;
-	dbMarkets.setMarket(d.data);
-	return d;
+		if (dbShips.getShipsAt(waypointSymbol) === null) {
+			return null;
+		}
+		const systemSymbol = utils.systemFromWaypoint(waypointSymbol);
+		let d = await api.send({endpoint: `/systems/${systemSymbol}/waypoints/${waypointSymbol}/market`});
+		delete d.data.transactions;
+		dbMarkets.setMarket(d.data);
+		return d;
     }
     return data;
 }
@@ -33,10 +33,10 @@ export async function system(ctx) {
 		const response = await api.send({endpoint: `/systems/${ctx.symbol}`});
 		if (response.error !== undefined) {
 			switch(response.error.code) {
-			case 404:
-				throw `Error retrieving info for system ${ctx.symbol}: ${response.error.message}`;
-			default: // yet unhandled error
-				throw response;
+				case 404:
+					throw `Error retrieving info for system ${ctx.symbol}: ${response.error.message}`;
+				default: // yet unhandled error
+					throw response;
 			}
 		}
 		s = response.data;
@@ -68,10 +68,10 @@ export async function waypoints(ctx) {
 			const response = await api.send({endpoint: `/systems/${ctx.symbol}/waypoints?limit=20&page=${page}`, priority: 98});
 			if (response.error !== undefined) {
 				switch(response.error.code) {
-				case 404:
-					throw `Error retrieving waypoints for system ${ctx.symbol}: ${response.error.message}`;
-				default: // yet unhandled error
-					throw response;
+					case 404:
+						throw `Error retrieving waypoints for system ${ctx.symbol}: ${response.error.message}`;
+					default: // yet unhandled error
+						throw response;
 				}
 			}
 			waypoints = waypoints.concat(response.data);
diff --git a/nodejs/lib/utils.js b/nodejs/lib/utils.js
deleted file mode 100644
index a2c8128..0000000
--- a/nodejs/lib/utils.js
+++ /dev/null
@@ -1,18 +0,0 @@
-// cargo is a ship.cargo object, want is an optional symbol
-export function categorizeCargo(cargo, want) {
-    const wanted = cargo.inventory.filter(i => i.symbol === want || i.symbol === 'ANTIMATTER');
-    const goods = cargo.inventory.filter(i => i.symbol !== want && i.symbol !== 'ANTIMATTER');
-    const wobj = wanted.reduce(function(acc, e) {
-	acc[e.symbol] = e.units;
-	return acc;
-    }, {});
-    const gobj = goods.reduce(function(acc, e) {
-	acc[e.symbol] = e.units;
-	return acc;
-    }, {});
-    return {wanted: wobj, goods: gobj};
-}
-
-export function systemFromWaypoint(waypoint) {
-	return waypoint.split('-').slice(0,2).join('-');
-}
diff --git a/nodejs/lib/utils.ts b/nodejs/lib/utils.ts
new file mode 100644
index 0000000..c5093a6
--- /dev/null
+++ b/nodejs/lib/utils.ts
@@ -0,0 +1,25 @@
+import { Cargo, CargoManifest } from '../model/cargo.ts';
+
+export type CategorizedCargo = {
+	wanted: CargoManifest;
+	goods: CargoManifest;
+};
+
+// cargo is a ship.cargo object, want is an optional symbol
+export function categorizeCargo(cargo: Cargo, want?: string): CategorizedCargo {
+	const wanted = cargo.inventory.filter(i => i.symbol === want || i.symbol === 'ANTIMATTER');
+	const goods = cargo.inventory.filter(i => i.symbol !== want && i.symbol !== 'ANTIMATTER');
+	const wobj = wanted.reduce(function(acc: CargoManifest, e) {
+		acc[e.symbol] = e.units;
+		return acc;
+	}, {});
+	const gobj = goods.reduce(function(acc: CargoManifest, e) {
+		acc[e.symbol] = e.units;
+		return acc;
+	}, {});
+	return {wanted: wobj, goods: gobj};
+}
+
+export function systemFromWaypoint(waypoint: string): string {
+	return waypoint.split('-').slice(0,2).join('-');
+}
diff --git a/nodejs/main.js b/nodejs/main.js
deleted file mode 100755
index a811b6a..0000000
--- a/nodejs/main.js
+++ /dev/null
@@ -1,9 +0,0 @@
-import * as autoContracting from './automation/contracting.js';
-import * as autoExploring from './automation/exploration.js';
-import * as autoInit from './automation/init.js';
-import * as api from './lib/api.js';
-import * as contracts from './lib/contracts.js';
-
-await autoInit.init();
-autoContracting.init();
-autoExploring.init();
diff --git a/nodejs/main.ts b/nodejs/main.ts
new file mode 100755
index 0000000..51be650
--- /dev/null
+++ b/nodejs/main.ts
@@ -0,0 +1,9 @@
+import * as autoContracting from './automation/contracting.ts';
+//import * as autoExploring from './automation/exploration.js';
+import * as autoInit from './automation/init.js';
+//import * as api from './lib/api.js';
+//import * as contracts from './lib/contracts.js';
+
+await autoInit.init();
+autoContracting.init();
+//autoExploring.init();
diff --git a/nodejs/model/agent.ts b/nodejs/model/agent.ts
new file mode 100644
index 0000000..dce6424
--- /dev/null
+++ b/nodejs/model/agent.ts
@@ -0,0 +1,8 @@
+export type Agent = {
+	accountId: string;
+	credits: number;
+	headquarters: string;
+	shipCount: number;
+	startingFaction: string;
+	symbol: string;
+};
diff --git a/nodejs/model/api.ts b/nodejs/model/api.ts
new file mode 100644
index 0000000..5092157
--- /dev/null
+++ b/nodejs/model/api.ts
@@ -0,0 +1,32 @@
+export type APIError = {
+	apiError: 'APIError';
+	error: string;
+	code: number;
+	data: any; // TODO
+};
+
+export type Meta = {
+	limit: number;
+	page: number;
+	total: number;
+}
+
+export type Request = {
+	endpoint: string; // the path part of the url to call
+	method?: string; // HTTP method for `fetch` call, defaults to 'GET'
+	page?: number; // run a paginated request starting from this page until all the following pages are fetched
+	payload?: { [key:string]: any}; // optional json object that will be sent along the request
+	priority?: number; // optional priority value, defaults to 10. lower than 10 means the message will be sent faster
+};
+
+export type RequestPromise<T> = {
+	reject: (reason?: any) => void;
+	request: Request;
+	resolve: (value: Response<T> | PromiseLike<Response<T>>) => void;
+};
+
+export type Response<T> = {
+	data: T;
+	error?: APIError;
+	meta?: Meta;
+}
diff --git a/nodejs/model/cargo.ts b/nodejs/model/cargo.ts
new file mode 100644
index 0000000..869fa49
--- /dev/null
+++ b/nodejs/model/cargo.ts
@@ -0,0 +1,17 @@
+export type Inventory = {
+	description: string;
+	name: string;
+	symbol: string;
+	units: number;
+};
+
+export type Cargo = {
+	"capacity": number;
+	"units": number;
+	"inventory": Array<Inventory>;
+};
+
+// Custom type, not from space traders api
+export type CargoManifest = {
+	[key: string]: number;
+};
diff --git a/nodejs/model/contract.ts b/nodejs/model/contract.ts
new file mode 100644
index 0000000..eb7add4
--- /dev/null
+++ b/nodejs/model/contract.ts
@@ -0,0 +1,22 @@
+export type Contract = {
+	id: string;
+	factionSymbol: string;
+	type: string;
+	terms: {
+		deadline: Date;
+		payment: {
+			onAccepted: number;
+			onFulfilled: number;
+		},
+		deliver: Array<{
+			tradeSymbol: string;
+			destinationSymbol: string;
+			unitsRequired: number;
+			unitsFulfilled: number;
+		}>;
+	};
+	accepted: boolean;
+	fulfilled: boolean;
+	expiration: Date;
+	deadlineToAccept: Date;
+};
diff --git a/nodejs/model/ship.ts b/nodejs/model/ship.ts
new file mode 100644
index 0000000..9aaf601
--- /dev/null
+++ b/nodejs/model/ship.ts
@@ -0,0 +1,56 @@
+import { Cargo } from './cargo.ts';
+
+export type Cooldown = {
+	shipSymbol: string;
+	totalSeconds: number;
+	remainingSeconds: number;
+};
+
+export type Consummed = {
+	amount: number;
+	timestamp: Date;
+};
+
+export type Fuel = {
+	capacity: number;
+	consummed: Consummed;
+	current: number;
+};
+
+export type Nav = {
+	flightMode: string;
+	route: Route;
+	status: string;
+	systemSymbol: string;
+	waypointSymbol: string;
+};
+
+export type Route = {
+	arrival: Date;
+	departureTime: Date;
+	destination: RouteEndpoint;
+	origin: RouteEndpoint;
+};
+
+export type RouteEndpoint = {
+	type: string;
+	symbol: string;
+	systemSymbol: string;
+	x: number;
+	y: number;
+};
+
+export type Ship = {
+	cargo: Cargo;
+	cooldown: Cooldown;
+	// crew
+	// engine
+	// frame
+	fuel: Fuel;
+	// modules
+	// mounts
+	nav: Nav;
+	// reactor
+	// registration
+	symbol: string;
+};
diff --git a/nodejs/tsconfig.json b/nodejs/tsconfig.json
new file mode 100644
index 0000000..b6ddffc
--- /dev/null
+++ b/nodejs/tsconfig.json
@@ -0,0 +1,109 @@
+{
+  "compilerOptions": {
+    /* Visit https://aka.ms/tsconfig to read more about this file */
+
+    /* Projects */
+    // "incremental": true,                              /* Save .tsbuildinfo files to allow for incremental compilation of projects. */
+    // "composite": true,                                /* Enable constraints that allow a TypeScript project to be used with project references. */
+    // "tsBuildInfoFile": "./.tsbuildinfo",              /* Specify the path to .tsbuildinfo incremental compilation file. */
+    // "disableSourceOfProjectReferenceRedirect": true,  /* Disable preferring source files instead of declaration files when referencing composite projects. */
+    // "disableSolutionSearching": true,                 /* Opt a project out of multi-project reference checking when editing. */
+    // "disableReferencedProjectLoad": true,             /* Reduce the number of projects loaded automatically by TypeScript. */
+
+    /* Language and Environment */
+    "target": "es2022",                                  /* Set the JavaScript language version for emitted JavaScript and include compatible library declarations. */
+    // "lib": [],                                        /* Specify a set of bundled library declaration files that describe the target runtime environment. */
+    // "jsx": "preserve",                                /* Specify what JSX code is generated. */
+    // "experimentalDecorators": true,                   /* Enable experimental support for legacy experimental decorators. */
+    // "emitDecoratorMetadata": true,                    /* Emit design-type metadata for decorated declarations in source files. */
+    // "jsxFactory": "",                                 /* Specify the JSX factory function used when targeting React JSX emit, e.g. 'React.createElement' or 'h'. */
+    // "jsxFragmentFactory": "",                         /* Specify the JSX Fragment reference used for fragments when targeting React JSX emit e.g. 'React.Fragment' or 'Fragment'. */
+    // "jsxImportSource": "",                            /* Specify module specifier used to import the JSX factory functions when using 'jsx: react-jsx*'. */
+    // "reactNamespace": "",                             /* Specify the object invoked for 'createElement'. This only applies when targeting 'react' JSX emit. */
+    // "noLib": true,                                    /* Disable including any library files, including the default lib.d.ts. */
+    // "useDefineForClassFields": true,                  /* Emit ECMAScript-standard-compliant class fields. */
+    // "moduleDetection": "auto",                        /* Control what method is used to detect module-format JS files. */
+
+    /* Modules */
+    "module": "esnext",                                /* Specify what module code is generated. */
+    // "rootDir": "./",                                  /* Specify the root folder within your source files. */
+    // "moduleResolution": "node10",                     /* Specify how TypeScript looks up a file from a given module specifier. */
+    // "baseUrl": "./",                                  /* Specify the base directory to resolve non-relative module names. */
+    // "paths": {},                                      /* Specify a set of entries that re-map imports to additional lookup locations. */
+    // "rootDirs": [],                                   /* Allow multiple folders to be treated as one when resolving modules. */
+    // "typeRoots": [],                                  /* Specify multiple folders that act like './node_modules/@types'. */
+    // "types": [],                                      /* Specify type package names to be included without being referenced in a source file. */
+    // "allowUmdGlobalAccess": true,                     /* Allow accessing UMD globals from modules. */
+    // "moduleSuffixes": [],                             /* List of file name suffixes to search when resolving a module. */
+    "allowImportingTsExtensions": true,               /* Allow imports to include TypeScript file extensions. Requires '--moduleResolution bundler' and either '--noEmit' or '--emitDeclarationOnly' to be set. */
+    // "resolvePackageJsonExports": true,                /* Use the package.json 'exports' field when resolving package imports. */
+    // "resolvePackageJsonImports": true,                /* Use the package.json 'imports' field when resolving imports. */
+    // "customConditions": [],                           /* Conditions to set in addition to the resolver-specific defaults when resolving imports. */
+    // "resolveJsonModule": true,                        /* Enable importing .json files. */
+    // "allowArbitraryExtensions": true,                 /* Enable importing files with any extension, provided a declaration file is present. */
+    // "noResolve": true,                                /* Disallow 'import's, 'require's or '<reference>'s from expanding the number of files TypeScript should add to a project. */
+
+    /* JavaScript Support */
+    "allowJs": true,                                  /* Allow JavaScript files to be a part of your program. Use the 'checkJS' option to get errors from these files. */
+    // "checkJs": true,                                  /* Enable error reporting in type-checked JavaScript files. */
+    // "maxNodeModuleJsDepth": 1,                        /* Specify the maximum folder depth used for checking JavaScript files from 'node_modules'. Only applicable with 'allowJs'. */
+
+    /* Emit */
+    // "declaration": true,                              /* Generate .d.ts files from TypeScript and JavaScript files in your project. */
+    // "declarationMap": true,                           /* Create sourcemaps for d.ts files. */
+    // "emitDeclarationOnly": true,                      /* Only output d.ts files and not JavaScript files. */
+    // "sourceMap": true,                                /* Create source map files for emitted JavaScript files. */
+    // "inlineSourceMap": true,                          /* Include sourcemap files inside the emitted JavaScript. */
+    // "outFile": "./",                                  /* Specify a file that bundles all outputs into one JavaScript file. If 'declaration' is true, also designates a file that bundles all .d.ts output. */
+    // "outDir": "./",                                   /* Specify an output folder for all emitted files. */
+    // "removeComments": true,                           /* Disable emitting comments. */
+    "noEmit": true,                                   /* Disable emitting files from a compilation. */
+    // "importHelpers": true,                            /* Allow importing helper functions from tslib once per project, instead of including them per-file. */
+    // "importsNotUsedAsValues": "remove",               /* Specify emit/checking behavior for imports that are only used for types. */
+    // "downlevelIteration": true,                       /* Emit more compliant, but verbose and less performant JavaScript for iteration. */
+    // "sourceRoot": "",                                 /* Specify the root path for debuggers to find the reference source code. */
+    // "mapRoot": "",                                    /* Specify the location where debugger should locate map files instead of generated locations. */
+    // "inlineSources": true,                            /* Include source code in the sourcemaps inside the emitted JavaScript. */
+    // "emitBOM": true,                                  /* Emit a UTF-8 Byte Order Mark (BOM) in the beginning of output files. */
+    // "newLine": "crlf",                                /* Set the newline character for emitting files. */
+    // "stripInternal": true,                            /* Disable emitting declarations that have '@internal' in their JSDoc comments. */
+    // "noEmitHelpers": true,                            /* Disable generating custom helper functions like '__extends' in compiled output. */
+    // "noEmitOnError": true,                            /* Disable emitting files if any type checking errors are reported. */
+    // "preserveConstEnums": true,                       /* Disable erasing 'const enum' declarations in generated code. */
+    // "declarationDir": "./",                           /* Specify the output directory for generated declaration files. */
+    // "preserveValueImports": true,                     /* Preserve unused imported values in the JavaScript output that would otherwise be removed. */
+
+    /* Interop Constraints */
+    // "isolatedModules": true,                          /* Ensure that each file can be safely transpiled without relying on other imports. */
+    // "verbatimModuleSyntax": true,                     /* Do not transform or elide any imports or exports not marked as type-only, ensuring they are written in the output file's format based on the 'module' setting. */
+    // "allowSyntheticDefaultImports": true,             /* Allow 'import x from y' when a module doesn't have a default export. */
+    "esModuleInterop": true,                             /* Emit additional JavaScript to ease support for importing CommonJS modules. This enables 'allowSyntheticDefaultImports' for type compatibility. */
+    // "preserveSymlinks": true,                         /* Disable resolving symlinks to their realpath. This correlates to the same flag in node. */
+    "forceConsistentCasingInFileNames": true,            /* Ensure that casing is correct in imports. */
+
+    /* Type Checking */
+    "strict": true,                                      /* Enable all strict type-checking options. */
+    //"noImplicitAny": true,                            /* Enable error reporting for expressions and declarations with an implied 'any' type. */
+    // "strictNullChecks": true,                         /* When type checking, take into account 'null' and 'undefined'. */
+    // "strictFunctionTypes": true,                      /* When assigning functions, check to ensure parameters and the return values are subtype-compatible. */
+    // "strictBindCallApply": true,                      /* Check that the arguments for 'bind', 'call', and 'apply' methods match the original function. */
+    // "strictPropertyInitialization": true,             /* Check for class properties that are declared but not set in the constructor. */
+    // "noImplicitThis": true,                           /* Enable error reporting when 'this' is given the type 'any'. */
+    // "useUnknownInCatchVariables": true,               /* Default catch clause variables as 'unknown' instead of 'any'. */
+    // "alwaysStrict": true,                             /* Ensure 'use strict' is always emitted. */
+    // "noUnusedLocals": true,                           /* Enable error reporting when local variables aren't read. */
+    // "noUnusedParameters": true,                       /* Raise an error when a function parameter isn't read. */
+    // "exactOptionalPropertyTypes": true,               /* Interpret optional property types as written, rather than adding 'undefined'. */
+    // "noImplicitReturns": true,                        /* Enable error reporting for codepaths that do not explicitly return in a function. */
+    // "noFallthroughCasesInSwitch": true,               /* Enable error reporting for fallthrough cases in switch statements. */
+    // "noUncheckedIndexedAccess": true,                 /* Add 'undefined' to a type when accessed using an index. */
+    // "noImplicitOverride": true,                       /* Ensure overriding members in derived classes are marked with an override modifier. */
+    // "noPropertyAccessFromIndexSignature": true,       /* Enforces using indexed accessors for keys declared using an indexed type. */
+    // "allowUnusedLabels": true,                        /* Disable error reporting for unused labels. */
+    // "allowUnreachableCode": true,                     /* Disable error reporting for unreachable code. */
+
+    /* Completeness */
+    // "skipDefaultLibCheck": true,                      /* Skip type checking .d.ts files that are included with TypeScript. */
+    "skipLibCheck": true                                 /* Skip type checking all .d.ts files. */
+  }
+}