diff --git a/bin/add_fisken_invoices.ts b/bin/add_fisken_invoices.ts
index 97d3fae..328456f 100644
--- a/bin/add_fisken_invoices.ts
+++ b/bin/add_fisken_invoices.ts
@@ -16,8 +16,8 @@ knex.destroy()
 
 async function readdir(dir: string) {
   const files = (await fs.readdir(dir)).toSorted((a: string, b: string) => {
-    const [, aNum] = a.match(rFileName)
-    const [, bNum] = b.match(rFileName)
+    const [, aNum] = a.match(rFileName) as string[]
+    const [, bNum] = b.match(rFileName) as string[]
 
     if (parseInt(aNum) > parseInt(bNum)) {
       return 1
diff --git a/client/public/components/accounts_page.tsx b/client/public/components/accounts_page.tsx
index 4709118..59211db 100644
--- a/client/public/components/accounts_page.tsx
+++ b/client/public/components/accounts_page.tsx
@@ -1,16 +1,15 @@
-import { h } from 'preact'
+import { h, type FunctionComponent } from 'preact'
 import { useEffect, useState } from 'preact/hooks'
 import rek from 'rek'
 import Head from './head.ts'
-// import s from './accounts_page.module.scss'
 
-const AccountsPage = () => {
-  const [accounts, setAccounts] = useState([])
+import type { Account } from '../../../shared/types.ts'
+
+const AccountsPage: FunctionComponent = () => {
+  const [accounts, setAccounts] = useState<Account[]>([])
 
   useEffect(() => {
-    rek('/api/accounts').then((accounts) => {
-      setAccounts(accounts)
-    })
+    rek('/api/accounts').then(setAccounts)
   }, [])
 
   return (
diff --git a/client/public/components/app.tsx b/client/public/components/app.tsx
index 0045c47..f383054 100644
--- a/client/public/components/app.tsx
+++ b/client/public/components/app.tsx
@@ -1,4 +1,4 @@
-import { h } from 'preact'
+import { h, type FunctionComponent } from 'preact'
 import { useCallback, useEffect } from 'preact/hooks'
 import { LocationProvider, Route, Router } from 'preact-iso'
 import { get } from 'lowline'
@@ -11,6 +11,11 @@ import throttle from '../../shared/utils/throttle.ts'
 
 import s from './app.module.scss'
 
+type Props = {
+  error?: Error
+  title?: string
+}
+
 const remember = throttle(function remember() {
   window.history.replaceState(
     {
@@ -22,7 +27,7 @@ const remember = throttle(function remember() {
   )
 }, 100)
 
-export default function App({ error, title }) {
+const App: FunctionComponent<Props> = ({ error, title }) => {
   useEffect(() => {
     addEventListener('scroll', remember)
 
@@ -52,7 +57,7 @@ export default function App({ error, title }) {
           ) : (
             <Router onRouteChange={onRouteChange}>
               {routes.map((route) => (
-                <Route key={route.path} route={route} path={route.path} component={route.component} />
+                <Route key={route.path} path={route.path} component={route.component} />
               ))}
             </Router>
           )}
@@ -63,3 +68,5 @@ export default function App({ error, title }) {
     </LocationProvider>
   )
 }
+
+export default App
diff --git a/client/public/components/balances_page.tsx b/client/public/components/balances_page.tsx
index 3c956a9..1e9c39d 100644
--- a/client/public/components/balances_page.tsx
+++ b/client/public/components/balances_page.tsx
@@ -1,4 +1,4 @@
-import { h } from 'preact'
+import { h, type FunctionComponent } from 'preact'
 import { useEffect, useState } from 'preact/hooks'
 import cn from 'classnames'
 import rek from 'rek'
@@ -6,13 +6,15 @@ import Head from './head.ts'
 import { formatNumber } from '../utils/format_number.ts'
 import s from './balances_page.module.scss'
 
-const BalancesPage = () => {
-  const [balances, setBalances] = useState([])
+import type { Balance, FinancialYear } from '../../../shared/types.ts'
+
+const BalancesPage: FunctionComponent = () => {
+  const [balances, setBalances] = useState<Balance[]>([])
   const [years, setYears] = useState<number[]>([])
 
   useEffect(() => {
     rek(`/api/balances`).then(setBalances)
-    rek(`/api/financial-years`).then((years) => setYears(years.map((fy) => fy.year)))
+    rek(`/api/financial-years`).then((financialYears: FinancialYear[]) => setYears(financialYears.map((fy) => fy.year)))
   }, [])
 
   return (
diff --git a/client/public/components/entries_page.tsx b/client/public/components/entries_page.tsx
index f0e0698..f20127b 100644
--- a/client/public/components/entries_page.tsx
+++ b/client/public/components/entries_page.tsx
@@ -1,4 +1,4 @@
-import { h } from 'preact'
+import { h, type FunctionComponent } from 'preact'
 import { useCallback, useEffect, useState } from 'preact/hooks'
 import { useLocation } from 'preact-iso'
 import { isEmpty } from 'lowline'
@@ -8,12 +8,14 @@ import rek from 'rek'
 import Head from './head.ts'
 import serializeForm from '../../shared/utils/serialize_form.ts'
 
+import type { Entry, FinancialYear, Journal } from '../../../shared/types.ts'
+
 const dateYear = new Date().getFullYear()
 
-const EntriesPage = () => {
-  const [journals, setJournals] = useState([])
-  const [financialYears, setFinancialYears] = useState([])
-  const [entries, setEntries] = useState([])
+const EntriesPage: FunctionComponent = () => {
+  const [journals, setJournals] = useState<Journal[]>([])
+  const [financialYears, setFinancialYears] = useState<FinancialYear[]>([])
+  const [entries, setEntries] = useState<Entry[]>([])
 
   const location = useLocation()
 
@@ -22,7 +24,7 @@ const EntriesPage = () => {
   const onSubmit = useCallback((e: SubmitEvent) => {
     e.preventDefault()
 
-    const values = serializeForm(e.target as HTMLFormElement)
+    const values = serializeForm(e.target as HTMLFormElement) as Record<string, string>
 
     const search = !isEmpty(values) ? '?' + qs.stringify(values) : ''
 
@@ -30,16 +32,12 @@ const EntriesPage = () => {
   }, [])
 
   useEffect(() => {
-    rek('/api/journals').then((journals) => {
-      setJournals(journals)
-    })
-    rek('/api/financial-years').then((financialYears) => {
-      setFinancialYears(financialYears)
-    })
+    rek('/api/journals').then(setJournals)
+    rek('/api/financial-years').then(setFinancialYears)
   }, [])
 
   useEffect(() => {
-    rek(`/api/entries?journal=${selectedJournal}&year=${selectedYear}`).then((entries) => setEntries(entries))
+    rek(`/api/entries?journal=${selectedJournal}&year=${selectedYear}`).then(setEntries)
   }, [selectedJournal, selectedYear])
 
   return financialYears.length && journals.length ? (
diff --git a/client/public/components/entry_page.tsx b/client/public/components/entry_page.tsx
index 4b0b2ac..7ff51e0 100644
--- a/client/public/components/entry_page.tsx
+++ b/client/public/components/entry_page.tsx
@@ -1,4 +1,4 @@
-import { h } from 'preact'
+import { h, type FunctionComponent } from 'preact'
 import { useEffect, useState } from 'preact/hooks'
 import { useRoute } from 'preact-iso'
 import { formatNumber } from '../utils/format_number.ts'
@@ -8,14 +8,12 @@ import { type Entry } from '../../../shared/types.ts'
 
 import Head from './head.ts'
 
-const EntriesPage = () => {
-  const [entry, setEntry] = useState<Entry>(null)
+const EntryPage: FunctionComponent = () => {
+  const [entry, setEntry] = useState<Entry | null>(null)
   const route = useRoute()
 
   useEffect(() => {
-    rek(`/api/entries/${route.params.id}`).then((entry) => {
-      setEntry(entry)
-    })
+    rek(`/api/entries/${route.params.id}`).then(setEntry)
   }, [])
 
   if (!entry) return
@@ -84,4 +82,4 @@ const EntriesPage = () => {
   )
 }
 
-export default EntriesPage
+export default EntryPage
diff --git a/client/public/components/error_page.tsx b/client/public/components/error_page.tsx
index 35764e1..6ffd2cc 100644
--- a/client/public/components/error_page.tsx
+++ b/client/public/components/error_page.tsx
@@ -1,7 +1,7 @@
-import { h } from 'preact'
+import { h, type FunctionComponent } from 'preact'
 import Head from './head.ts'
 
-const OtherPage = ({ error }) => (
+const OtherPage: FunctionComponent<{ error: Error }> = ({ error }) => (
   <section>
     <Head>
       <title> : Error</title>
diff --git a/client/public/components/footer.tsx b/client/public/components/footer.tsx
index 861be7c..5eab7f4 100644
--- a/client/public/components/footer.tsx
+++ b/client/public/components/footer.tsx
@@ -1,5 +1,5 @@
-import { h } from 'preact'
+import { h, type FunctionComponent } from 'preact'
 
-const Footer = () => <footer />
+const Footer: FunctionComponent = () => <footer />
 
 export default Footer
diff --git a/client/public/components/head.ts b/client/public/components/head.ts
index ed26361..045e29a 100644
--- a/client/public/components/head.ts
+++ b/client/public/components/head.ts
@@ -1,9 +1,14 @@
-import { toChildArray, Component } from 'preact'
+import { toChildArray, Component, type VNode } from 'preact'
 import { mapKeys } from 'lowline'
 
+type Tag = {
+  type: string
+  attributes: Record<string, string>
+}
+
 const CLASSNAME = '__preact_generated__'
 
-const DOMAttributeNames = {
+const DOMAttributeNames: Record<string, string> = {
   acceptCharset: 'accept-charset',
   className: 'class',
   htmlFor: 'for',
@@ -12,11 +17,11 @@ const DOMAttributeNames = {
 
 const isBrowser = typeof window !== 'undefined'
 
-let mounted = []
+let mounted: Head[] = []
 
-function reducer(components) {
+function reducer(components: Head[]) {
   return components
-    .map((c) => toChildArray(c.props.children))
+    .map((c) => toChildArray(c.props.children) as VNode<any>[])
     .reduce((result, c) => result.concat(c), [])
     .reverse()
     .filter(unique())
@@ -27,18 +32,18 @@ function reducer(components) {
           result.title += toChildArray(c.props.children).join('')
         } else {
           result.tags.push({
-            type: c.type,
+            type: c.type as string,
             attributes: mapKeys(c.props, (_value, key) => DOMAttributeNames[key] || key),
           })
         }
 
         return result
       },
-      { title: '', tags: [] },
+      { title: '', tags: [] } as { title: string; tags: Tag[] },
     )
 }
 
-function updateClient({ title, tags }) {
+function updateClient({ title, tags }: { title: string; tags: Tag[] }) {
   const head = document.head
 
   const prevElements = Array.from(head.getElementsByClassName(CLASSNAME))
@@ -60,7 +65,7 @@ function updateClient({ title, tags }) {
   document.title = title
 }
 
-function createDOMElement(tag) {
+function createDOMElement(tag: Tag) {
   const el = document.createElement(tag.type)
   const attributes = tag.attributes || {}
 
@@ -80,11 +85,11 @@ const METATYPES = ['name', 'httpEquiv', 'charSet', 'itemProp']
 // returns a function for filtering head child elements
 // which shouldn't be duplicated, like <title/>.
 function unique() {
-  const tags = []
-  const metaTypes = []
-  const metaCategories = {}
+  const tags: string[] = []
+  const metaTypes: string[] = []
+  const metaCategories: Record<string, string[]> = {}
 
-  return (h) => {
+  return (h: VNode<Record<string, string>>) => {
     switch (h.type) {
       case 'base':
         if (~tags.indexOf(h.type)) {
@@ -109,8 +114,8 @@ function unique() {
 
             metaTypes.push(metatype)
           } else {
-            const category = h.props[metatype]
-            const categories = metaCategories[metatype] || []
+            const category = h.props[metatype] as string
+            const categories: string[] = metaCategories[metatype] || []
 
             if (~categories.indexOf(category)) {
               return false
diff --git a/client/public/components/header.tsx b/client/public/components/header.tsx
index 9a02ce8..2be5552 100644
--- a/client/public/components/header.tsx
+++ b/client/public/components/header.tsx
@@ -1,7 +1,9 @@
-import { h } from 'preact'
+import { h, type FunctionComponent } from 'preact'
 import s from './header.module.scss'
 
-const Header = ({ routes }) => (
+import type { Route } from '../../../shared/types.ts'
+
+const Header: FunctionComponent<{ routes: Route[] }> = ({ routes }) => (
   <header>
     <h1>BRF Tegeltrasten</h1>
     <nav className={s.nav}>
diff --git a/client/public/components/invoice.tsx b/client/public/components/invoice.tsx
index c512754..133ad92 100644
--- a/client/public/components/invoice.tsx
+++ b/client/public/components/invoice.tsx
@@ -2,12 +2,14 @@ import { h, type FunctionalComponent } from 'preact'
 import { useEffect, useState } from 'preact/hooks'
 import rek from 'rek'
 
+import type { Transaction } from '../../../shared/types.ts'
+
 interface Props {
   year: number
 }
 
 const Invoices: FunctionalComponent<Props> = ({ year }) => {
-  const [invoices, setInvoices] = useState([])
+  const [invoices, setInvoices] = useState<Transaction[]>([])
 
   useEffect(() => {
     rek(`/api/invoices/by-year/${year}`).then(setInvoices)
diff --git a/client/public/components/invoice_page.tsx b/client/public/components/invoice_page.tsx
index 7c373ad..6d6e3e0 100644
--- a/client/public/components/invoice_page.tsx
+++ b/client/public/components/invoice_page.tsx
@@ -1,16 +1,18 @@
-import { h } from 'preact'
+import { h, type FunctionComponent } from 'preact'
 import { useEffect, useState } from 'preact/hooks'
 import { useRoute } from 'preact-iso'
 import rek from 'rek'
 import Head from './head.ts'
 import { formatNumber } from '../utils/format_number.ts'
 
-const InvoicePage = () => {
-  const [invoice, setInvoice] = useState(null)
+import type { Invoice } from '../../../shared/types.ts'
+
+const InvoicePage: FunctionComponent = () => {
+  const [invoice, setInvoice] = useState<Invoice | null>(null)
   const route = useRoute()
 
   useEffect(() => {
-    rek(`/api/invoices/${route.params.id}`).then((invoice) => setInvoice(invoice))
+    rek(`/api/invoices/${route.params.id}`).then(setInvoice)
   }, [])
 
   return (
diff --git a/client/public/components/invoices_by_supplier_page.tsx b/client/public/components/invoices_by_supplier_page.tsx
index 2486971..05e296f 100644
--- a/client/public/components/invoices_by_supplier_page.tsx
+++ b/client/public/components/invoices_by_supplier_page.tsx
@@ -1,25 +1,25 @@
-import { h } from 'preact'
+import { h, type FunctionComponent } from 'preact'
+// @ts-ignore
 import Format from 'easy-tz/format'
 import { useEffect, useState } from 'preact/hooks'
 import { useRoute } from 'preact-iso'
 import rek from 'rek'
 import Head from './head.ts'
+import type { Invoice, Supplier } from '../../../shared/types.ts'
 
 const format = Format.bind(null, null, 'YYYY.MM.DD')
 
-const InvoicesPage = () => {
-  const [supplier, setSupplier] = useState(null)
-  const [invoices, setInvoices] = useState([])
-  const [totalAmount, setTotalAmount] = useState<number>(null)
+const InvoicesPage: FunctionComponent = () => {
+  const [supplier, setSupplier] = useState<Supplier | null>(null)
+  const [invoices, setInvoices] = useState<Invoice[]>([])
+  const [totalAmount, setTotalAmount] = useState<number | null>(null)
 
   const route = useRoute()
 
   useEffect(() => {
-    rek(`/api/suppliers/${route.params.supplier}`).then((supplier) => setSupplier(supplier))
-    rek(`/api/invoices?supplier=${route.params.supplier}`).then((invoices) => setInvoices(invoices))
-    rek(`/api/invoices/total-amount?supplier=${route.params.supplier}`).then((totalAmount) =>
-      setTotalAmount(totalAmount.amount),
-    )
+    rek(`/api/suppliers/${route.params.supplier}`).then(setSupplier)
+    rek(`/api/invoices?supplier=${route.params.supplier}`).then(setInvoices)
+    rek(`/api/invoices/total-amount?supplier=${route.params.supplier}`).then(setTotalAmount)
   }, [route.params.supplier])
 
   return (
diff --git a/client/public/components/invoices_page.tsx b/client/public/components/invoices_page.tsx
index de7341f..b3be409 100644
--- a/client/public/components/invoices_page.tsx
+++ b/client/public/components/invoices_page.tsx
@@ -1,13 +1,15 @@
-import { h } from 'preact'
+import { h, type FunctionComponent } from 'preact'
 import { useEffect, useState } from 'preact/hooks'
 import rek from 'rek'
 import Head from './head.ts'
 
-const InvoicesPage = () => {
-  const [suppliers, setSuppliers] = useState([])
+import type { Supplier } from '../../../shared/types.ts'
+
+const InvoicesPage: FunctionComponent = () => {
+  const [suppliers, setSuppliers] = useState<Supplier[]>([])
 
   useEffect(() => {
-    rek('/api/suppliers').then((suppliers) => setSuppliers(suppliers))
+    rek('/api/suppliers').then(setSuppliers)
   }, [])
 
   return (
diff --git a/client/public/components/not_found_page.tsx b/client/public/components/not_found_page.tsx
index 0e37268..8dad3e5 100644
--- a/client/public/components/not_found_page.tsx
+++ b/client/public/components/not_found_page.tsx
@@ -1,5 +1,7 @@
-import { h } from 'preact'
+import { h, type FunctionComponent } from 'preact'
 
-export default function NotFoundPage() {
+const NotFoundPage: FunctionComponent = () => {
   return <h1>Not Found</h1>
 }
+
+export default NotFoundPage
diff --git a/client/public/components/object.tsx b/client/public/components/object.tsx
index df64050..90882f9 100644
--- a/client/public/components/object.tsx
+++ b/client/public/components/object.tsx
@@ -2,12 +2,14 @@ import { h, type FunctionalComponent } from 'preact'
 import { useEffect, useState } from 'preact/hooks'
 import rek from 'rek'
 
+import type { TransactionFull } from '../../../shared/types.ts'
+
 interface Props {
   objectId: number
 }
 
 const Result: FunctionalComponent<Props> = ({ objectId }) => {
-  const [transactions, setTransactions] = useState([])
+  const [transactions, setTransactions] = useState<TransactionFull[]>([])
 
   useEffect(() => {
     rek(`/api/objects/${objectId}`).then(setTransactions)
diff --git a/client/public/components/objects_page.tsx b/client/public/components/objects_page.tsx
index 2906ea3..05c300a 100644
--- a/client/public/components/objects_page.tsx
+++ b/client/public/components/objects_page.tsx
@@ -1,16 +1,17 @@
-import { h } from 'preact'
+import { h, type FunctionComponent } from 'preact'
 import { useEffect, useState } from 'preact/hooks'
 import rek from 'rek'
 import Head from './head.ts'
 import Object from './object.tsx'
 import s from './results_page.module.scss'
+import type { Object as ObjectType } from '../../../shared/types.ts'
 
-const ObjectsPage = () => {
-  const [objects, setObjects] = useState([])
-  const [currentObject, setCurrentObject] = useState(null)
+const ObjectsPage: FunctionComponent = () => {
+  const [objects, setObjects] = useState<ObjectType[]>([])
+  const [currentObject, setCurrentObject] = useState<ObjectType | null>(null)
 
   useEffect(() => {
-    rek('/api/objects').then(setObjects)
+    rek('/api/objects').then((objects: ObjectType[]) => setObjects(objects))
   }, [])
 
   return (
diff --git a/client/public/components/results_page.tsx b/client/public/components/results_page.tsx
index fa092d2..17ed784 100644
--- a/client/public/components/results_page.tsx
+++ b/client/public/components/results_page.tsx
@@ -1,4 +1,4 @@
-import { h } from 'preact'
+import { h, type FunctionComponent } from 'preact'
 import { useEffect, useState } from 'preact/hooks'
 import cn from 'classnames'
 import rek from 'rek'
@@ -6,13 +6,15 @@ import Head from './head.ts'
 import { formatNumber } from '../utils/format_number.ts'
 import s from './results_page.module.scss'
 
-const ResultsPage = () => {
-  const [results, setResults] = useState([])
+import type { FinancialYear, Result } from '../../../shared/types.ts'
+
+const ResultsPage: FunctionComponent = () => {
+  const [results, setResults] = useState<Result[]>([])
   const [years, setYears] = useState<number[]>([])
 
   useEffect(() => {
-    rek(`/api/results`).then(setResults)
-    rek(`/api/financial-years`).then((years) => setYears(years.map((fy) => fy.year)))
+    rek(`/api/results`).then((results: Result[]) => setResults(results))
+    rek(`/api/financial-years`).then((financialYears: FinancialYear[]) => setYears(financialYears.map((fy) => fy.year)))
   }, [])
 
   return (
diff --git a/client/public/components/start_page.tsx b/client/public/components/start_page.tsx
index 23f6e63..d53fbab 100644
--- a/client/public/components/start_page.tsx
+++ b/client/public/components/start_page.tsx
@@ -1,6 +1,6 @@
-import { h } from 'preact'
+import { h, type FunctionComponent } from 'preact'
 
-const StartPage = () => (
+const StartPage: FunctionComponent = () => (
   <section>
     <h1>Fart Page</h1>
 
diff --git a/client/public/components/transactions_page.tsx b/client/public/components/transactions_page.tsx
index 8a6a5f7..1d3832e 100644
--- a/client/public/components/transactions_page.tsx
+++ b/client/public/components/transactions_page.tsx
@@ -1,4 +1,4 @@
-import { h } from 'preact'
+import { h, type FunctionComponent } from 'preact'
 import { useCallback, useEffect, useState } from 'preact/hooks'
 import { useLocation } from 'preact-iso'
 import { isEmpty } from 'lowline'
@@ -8,16 +8,18 @@ import Head from './head.ts'
 import serializeForm from '../../shared/utils/serialize_form.ts'
 import { formatNumber } from '../utils/format_number.ts'
 
-const TransactionsPage = () => {
-  const [financialYears, setFinancialYears] = useState([])
-  const [transactions, setTransactions] = useState([])
+import type { TransactionFull, FinancialYear } from '../../../shared/types.ts'
+
+const TransactionsPage: FunctionComponent = () => {
+  const [financialYears, setFinancialYears] = useState<FinancialYear[]>([])
+  const [transactions, setTransactions] = useState<TransactionFull[]>([])
 
   const location = useLocation()
 
   const onSubmit = useCallback((e: SubmitEvent) => {
     e.preventDefault()
 
-    const values = serializeForm(e.target as HTMLFormElement)
+    const values = serializeForm(e.target as HTMLFormElement) as Record<string, string>
 
     const search = !isEmpty(values) ? '?' + qs.stringify(values) : ''
 
@@ -25,7 +27,7 @@ const TransactionsPage = () => {
   }, [])
 
   useEffect(() => {
-    rek('/api/financial-years').then((financialYears) => {
+    rek('/api/financial-years').then((financialYears: FinancialYear[]) => {
       setFinancialYears(financialYears)
     })
   }, [])
@@ -33,7 +35,7 @@ const TransactionsPage = () => {
   useEffect(() => {
     const search = location.url.split('?')[1] || ''
 
-    rek(`/api/transactions${search ? '?' + search : ''}`).then((transactions) => {
+    rek(`/api/transactions${search ? '?' + search : ''}`).then((transactions: TransactionFull[]) => {
       setTransactions(transactions)
     })
   }, [location.url])
diff --git a/client/public/utils/format_number.ts b/client/public/utils/format_number.ts
index 8351b79..7b9eda5 100644
--- a/client/public/utils/format_number.ts
+++ b/client/public/utils/format_number.ts
@@ -5,7 +5,7 @@ const priceFormatter = new Intl.NumberFormat('sv-SE', {
   maximumFractionDigits: 0,
 })
 
-export const formatPrice = (price) => priceFormatter.format(price)
+export const formatPrice = (price: number) => priceFormatter.format(price)
 
 const numberFormatter = new Intl.NumberFormat('sv-SE', {
   style: 'decimal',
@@ -13,4 +13,4 @@ const numberFormatter = new Intl.NumberFormat('sv-SE', {
   maximumFractionDigits: 2,
 })
 
-export const formatNumber = (nbr) => numberFormatter.format(nbr)
+export const formatNumber = (nbr: number) => numberFormatter.format(nbr)
diff --git a/client/shared/components/button_factory.tsx b/client/shared/components/button_factory.tsx
index 2019134..e04d502 100644
--- a/client/shared/components/button_factory.tsx
+++ b/client/shared/components/button_factory.tsx
@@ -1,24 +1,47 @@
 import { h, type FunctionComponent, type PointerEventHandler } from 'preact'
 import cn from 'classnames'
 
-export default function buttonFactory({ defaults, icons, styles }) {
-  const Button: FunctionComponent<{
-    autoHeight?: boolean
-    className?: string
-    color?: string
-    design?: string
-    disabled?: boolean
-    fullWidth?: boolean
-    icon?: string
-    iconSize?: string
-    invert?: boolean
-    onClick?: PointerEventHandler<HTMLButtonElement>
-    size?: string
-    tabIndex?: number
-    tag?: string
-    title?: string
-    type?: 'button' | 'reset' | 'submit'
-  }> = ({
+type Styles<C extends string, D extends string, S extends string> = {
+  base: string
+  autoHeight?: string
+  fullWidth?: string
+  icon?: string
+  invert?: string
+} & Record<C, string> &
+  Record<D, string> &
+  Record<S, string>
+
+type Props<C extends string, D extends string, I extends string, S extends string> = {
+  autoHeight?: boolean
+  className?: string
+  color?: C
+  design?: D
+  disabled?: boolean
+  fullWidth?: boolean
+  icon?: I
+  iconSize?: string
+  invert?: boolean
+  onClick?: PointerEventHandler<HTMLButtonElement>
+  size?: S
+  tabIndex?: number
+  tag?: string
+  title?: string
+  type?: 'button' | 'reset' | 'submit'
+}
+
+type Options<C extends string, D extends string, I extends string, S extends string> = {
+  defaults: Partial<Props<C, D, I, S>>
+  icons: Record<I, string>
+  styles: Styles<C, D, S>
+}
+
+export default function buttonFactory<
+  C extends string = never,
+  D extends string = never,
+  I extends string = never,
+  S extends string = never,
+>({ defaults, icons, styles }: Options<C, D, I, S>) {
+  const Button: FunctionComponent<Props<C, D, I, S>> = ({
     autoHeight = defaults?.autoHeight,
     children,
     className,
diff --git a/client/shared/components/checkbox_factory.tsx b/client/shared/components/checkbox_factory.tsx
index 8587086..e7c3ab0 100644
--- a/client/shared/components/checkbox_factory.tsx
+++ b/client/shared/components/checkbox_factory.tsx
@@ -1,26 +1,30 @@
-import { h } from 'preact'
+import { h, type FunctionComponent } from 'preact'
+import { type ChangeEvent } from 'preact/compat'
 import { useCallback, useEffect, useRef, useState } from 'preact/hooks'
 import cn from 'classnames'
 
-/**
- * @param {{
- *   base?: string
- *   touched?: string
- *   element?: string
- *   label?: string
- * }} styles
- * @returns {import('preact').FunctionComponent<{
- *    autoFocus?: boolean
- *    className?: string
- *    defaultChecked?: boolean
- *    disabled?: boolean
- *    name: string
- *    label?: string
- *    required?: boolean
- * }>}
- */
-export default function checkboxFactory(styles) {
-  const Checkbox = ({
+type Styles<S extends string> = {
+  base?: string
+  element?: string
+  label?: string
+  touched?: string
+} & Record<S, string>
+
+type Props<S extends string> = {
+  autoFocus?: boolean
+  className?: string
+  defaultChecked?: any
+  disabled?: boolean
+  label?: string
+  name?: string
+  onChange?: (e: ChangeEvent) => void
+  required?: boolean
+  style: S
+  value?: string
+}
+
+export default function checkboxFactory<S extends string = never>(styles: Styles<S>) {
+  const Checkbox: FunctionComponent<Props<S>> = ({
     autoFocus,
     className,
     defaultChecked,
@@ -29,16 +33,16 @@ export default function checkboxFactory(styles) {
     label,
     onChange,
     required,
-    style = 'normal',
+    style,
     value = 'true',
   }) => {
     const [touched, setTouched] = useState(false)
-    const checkboxRef = useRef<HTMLInputElement>()
+    const checkboxRef = useRef<HTMLInputElement>(null)
 
     const onBlur = useCallback(() => setTouched(true), [])
 
     useEffect(() => {
-      const form = checkboxRef.current.form
+      const form = checkboxRef.current!.form!
       const resetTouched = setTouched.bind(null, false)
 
       form.addEventListener('reset', resetTouched)
@@ -47,7 +51,7 @@ export default function checkboxFactory(styles) {
     }, [])
 
     useEffect(() => {
-      if (autoFocus) checkboxRef.current.focus()
+      if (autoFocus) checkboxRef.current!.focus()
     }, [autoFocus])
 
     return (
diff --git a/client/shared/components/image_upload_factory.tsx b/client/shared/components/image_upload_factory.tsx
index 33bb630..f303def 100644
--- a/client/shared/components/image_upload_factory.tsx
+++ b/client/shared/components/image_upload_factory.tsx
@@ -1,11 +1,36 @@
-import { h } from 'preact'
+import { h, type FunctionComponent } from 'preact'
 import { useCallback, useRef, useState } from 'preact/hooks'
 import cn from 'classnames'
 
 // TODO when form resets after update the previous image flashes quickly after setImageSrc(null) and before new defaultValue propagates
 
-const fileUploadFactory = ({ styles }) => {
-  const FileUpload = ({
+type Styles = {
+  base?: string
+  element?: string
+  label?: string
+  noMargin?: string
+  touched?: string
+  image?: string
+}
+
+type Options = {
+  styles: Styles
+}
+
+type Props = {
+  autoFocus?: boolean
+  className?: string
+  defaultValue?: any
+  disabled?: boolean
+  label?: string
+  name?: string
+  noMargin?: boolean
+  placeholder?: string
+  required?: boolean
+}
+
+export default function fileUploadFactory({ styles }: Options) {
+  const FileUpload: FunctionComponent<Props> = ({
     autoFocus,
     className,
     defaultValue,
@@ -17,14 +42,14 @@ const fileUploadFactory = ({ styles }) => {
     required,
   }) => {
     const [touched, setTouched] = useState(false)
-    const inputRef = useRef(null)
-    const imgRef = useRef(null)
-    const [imageSrc, setImageSrc] = useState(null)
+    const inputRef = useRef<HTMLInputElement>(null)
+    const imgRef = useRef<HTMLImageElement>(null)
+    const [imageSrc, setImageSrc] = useState<string | null>(null)
 
-    const onImageChange = useCallback((e) => {
+    const onImageChange = useCallback((e: Event) => {
       e.preventDefault()
 
-      const form = inputRef.current.form
+      const form = inputRef.current!.form!
 
       const onReset = () => {
         setTouched(false)
@@ -33,8 +58,8 @@ const fileUploadFactory = ({ styles }) => {
 
       form.addEventListener('reset', onReset)
 
-      imgRef.current.addEventListener('load', () => URL.revokeObjectURL(imgRef.current.src), { once: true })
-      setImageSrc(URL.createObjectURL(e.currentTarget.files[0]))
+      imgRef.current!.addEventListener('load', () => URL.revokeObjectURL(imgRef.current!.src), { once: true })
+      setImageSrc(URL.createObjectURL((e.currentTarget! as HTMLInputElement).files![0]))
 
       return () => form.removeEventListerner('reset', onReset)
     }, [])
@@ -66,5 +91,3 @@ const fileUploadFactory = ({ styles }) => {
 
   return FileUpload
 }
-
-export default fileUploadFactory
diff --git a/client/shared/components/input_factory.tsx b/client/shared/components/input_factory.tsx
index 6f15300..d42d746 100644
--- a/client/shared/components/input_factory.tsx
+++ b/client/shared/components/input_factory.tsx
@@ -3,7 +3,7 @@ import { useCallback, useEffect, useRef, useState } from 'preact/hooks'
 import cn from 'classnames'
 import escapeRegex from '../utils/escape_regex.ts'
 
-export default function inputFactory(styles: {
+type Styles<C extends string, D extends string, S extends string> = {
   base?: string
   touched?: string
   element?: string
@@ -13,22 +13,38 @@ export default function inputFactory(styles: {
   icon?: string
   labelIcon?: string
   center?: string
-}): FunctionComponent<{
-  autoFocus?: boolean
+} & Record<C, string> &
+  Record<D, string> &
+  Record<S, string>
+
+type Props<C extends string, D extends string, S extends string> = {
   autoComplete?: string
+  autoFocus?: boolean
+  center?: boolean
   className?: string
+  classNames?: Partial<Styles<C, D, S>>
+  color: C
   defaultValue?: string
+  design: D
   disabled?: boolean
+  icon: string
+  label: string
   name: string
   noMargin?: boolean
-  label: string
   pattern?: string
   placeholder?: string
   required?: boolean
-  type?: string
+  sameAs?: string
   showValidity?: boolean
-}> {
-  const Input = ({
+  size?: S
+  type?: string
+  value?: any
+}
+
+export default function inputFactory<C extends string = never, D extends string = never, S extends string = never>(
+  styles: Styles<C, D, S>,
+) {
+  const Input: FunctionComponent<Props<C, D, S>> = ({
     autoComplete,
     autoFocus,
     center,
@@ -46,28 +62,27 @@ export default function inputFactory(styles: {
     placeholder,
     required,
     sameAs,
-    size = 'medium',
+    size,
     type = 'text',
     value,
     showValidity = true,
   }) => {
     const [touched, setTouched] = useState(false)
-    const inputRef = useRef<HTMLInputElement>()
+    const inputRef = useRef<HTMLInputElement>(null)
 
     const onBlur = useCallback(() => setTouched(true), [])
 
     useEffect(() => {
-      function onInput(e) {
-        inputRef.current!.pattern = escapeRegex(e.target.value)
+      function onInput(e: Event) {
+        inputRef.current!.pattern = escapeRegex((e.target! as HTMLInputElement).value)
       }
 
-      const form = inputRef.current!.form
+      const form = inputRef.current!.form!
       const resetTouched = setTouched.bind(null, false)
 
       form.addEventListener('reset', resetTouched)
 
-      let sameAsInput
-
+      let sameAsInput: HTMLInputElement
       if (sameAs) {
         sameAsInput = form[sameAs]
         sameAsInput.addEventListener('input', onInput)
@@ -80,7 +95,7 @@ export default function inputFactory(styles: {
     }, [])
 
     useEffect(() => {
-      if (autoFocus) inputRef.current.focus()
+      if (autoFocus) inputRef.current!.focus()
     }, [autoFocus])
 
     const id = styles.element + '_' + name
diff --git a/client/shared/components/link_button_factory.tsx b/client/shared/components/link_button_factory.tsx
index 0a0275b..51aae97 100644
--- a/client/shared/components/link_button_factory.tsx
+++ b/client/shared/components/link_button_factory.tsx
@@ -1,21 +1,48 @@
 import { h, type FunctionComponent } from 'preact'
 import cn from 'classnames'
 
-export default function linkButtonFactory({ defaults, icons, styles }) {
-  const LinkButton: FunctionComponent<{
-    autoHeight?: boolean
-    className?: string
-    color?: string
-    design?: string
-    href?: string
-    fullWidth?: boolean
-    icon?: string
-    iconSize?: string
-    invert?: boolean
-    size?: string
-    tabIndex?: number
-    title?: string
-  }> = ({
+type Styles<C extends string, D extends string, S extends string> = {
+  base?: string
+  touched?: string
+  element?: string
+  label?: string
+  icon?: string
+
+  autoHeight?: string
+  fullWidth?: string
+  invert?: string
+} & Record<C, string> &
+  Record<D, string> &
+  Record<S, string>
+
+type Options<C extends string, D extends string, I extends string, S extends string> = {
+  defaults: Pick<Props<C, D, I, S>, 'autoHeight' | 'color' | 'design' | 'fullWidth' | 'icon' | 'invert' | 'size'>
+  icons: Record<I, string>
+  styles: Styles<C, D, S>
+}
+
+type Props<C extends string, D extends string, I extends string, S extends string> = {
+  autoHeight?: boolean
+  className?: string
+  color?: C
+  design?: D
+  href?: string
+  fullWidth?: boolean
+  icon?: I
+  iconSize?: string
+  invert?: boolean
+  size?: S
+  tabIndex?: number
+  title?: string
+}
+
+export default function linkButtonFactory<
+  C extends string = never,
+  D extends string = never,
+  I extends string = never,
+  S extends string = never,
+>({ defaults, icons, styles }: Options<C, D, I, S>) {
+  const LinkButton: FunctionComponent<Props<C, D, I, S>> = ({
     autoHeight = defaults?.autoHeight,
     children,
     className,
diff --git a/client/shared/components/portal.tsx b/client/shared/components/portal.tsx
index ac207e0..24db077 100644
--- a/client/shared/components/portal.tsx
+++ b/client/shared/components/portal.tsx
@@ -1,6 +1,9 @@
+import { type ContainerNode, type FunctionComponent } from 'preact'
 import { createPortal } from 'preact/compat'
 
-const Portal = ({ children, container = typeof document !== 'undefined' && document.body }) =>
-  createPortal(children, container)
+const Portal: FunctionComponent<{ container: ContainerNode }> = ({
+  children,
+  container = typeof document !== 'undefined' && document.body,
+}) => container && createPortal(children, container)
 
 export default Portal
diff --git a/client/shared/components/select_factory.tsx b/client/shared/components/select_factory.tsx
index a03996b..9fefb39 100644
--- a/client/shared/components/select_factory.tsx
+++ b/client/shared/components/select_factory.tsx
@@ -2,36 +2,54 @@ import { h, type FunctionComponent } from 'preact'
 import { useCallback, useEffect, useRef, useState } from 'preact/hooks'
 import cn from 'classnames'
 import mergeStyles from '../utils/merge_styles.ts'
+import { Script } from '@fastify/type-provider-typebox'
 
-// interface Styles {
-//   base?: string
-//   touched?: string
-//   element?: string
-//   label?: string
-// }
+type Styles<C extends string, D extends string, S extends string> = {
+  base?: string
+  touched?: string
+  element?: string
+  label?: string
+  icon?: string
+} & Record<C, string> &
+  Record<D, string> &
+  Record<S, string>
 
-export default function selectFactory({ styles }): FunctionComponent<{
+type Options<C extends string, D extends string, S extends string> = {
+  styles: Styles<C, D, S>
+}
+
+type Props<C extends string, D extends string, S extends string> = {
   autoFocus?: boolean
   className?: string
+  color?: C
   defaultValue?: string
+  design?: D
   disabled?: boolean
+  icon: ANY
+  label: string
   name: string
   noEmpty?: boolean
-  label: string
+  onChange?: ANY
+  options: string[] | number[] | { label: string; value: string | number }[]
   placeholder?: string
   required?: boolean
-  options: string[] | number[] | { label: string; value: string | number }
-}> {
+  size: S
+}
+
+// designs / color / size
+export default function selectFactory<C extends string = never, D extends string = never, S extends string = never>({
+  styles,
+}: Options<C, D, S>) {
   if (Array.isArray(styles)) {
     styles = mergeStyles(styles)
   }
 
-  const Select = ({
+  const Select: FunctionComponent<Props<C, D, S>> = ({
     autoFocus,
     className,
     color,
     defaultValue,
-    design = 'main',
+    design,
     disabled,
     icon,
     name,
@@ -40,11 +58,11 @@ export default function selectFactory({ styles }): FunctionComponent<{
     onChange,
     placeholder,
     required,
-    size = 'medium',
+    size,
     options,
   }) => {
     const [touched, setTouched] = useState(false)
-    const selectRef = useRef<HTMLSelectElement>()
+    const selectRef = useRef<HTMLSelectElement>(null)
 
     const onBlur = useCallback(() => setTouched(true), [])
 
@@ -90,10 +108,10 @@ export default function selectFactory({ styles }): FunctionComponent<{
           {options &&
             options.map((option) => (
               <option
-                key={option.value != null ? option.value : option}
-                value={option.value != null ? option.value : option}
+                key={typeof option === 'object' ? option.value : option}
+                value={typeof option === 'object' ? option.value : option}
               >
-                {option.label || option}
+                {typeof option === 'object' ? option.label : option}
               </option>
             ))}
         </select>
diff --git a/client/shared/components/textarea_factory.tsx b/client/shared/components/textarea_factory.tsx
index 3def871..d63161d 100644
--- a/client/shared/components/textarea_factory.tsx
+++ b/client/shared/components/textarea_factory.tsx
@@ -3,48 +3,50 @@ import { useCallback, useEffect, useRef, useState } from 'preact/hooks'
 import cn from 'classnames'
 import mergeStyles from '../utils/merge_styles.ts'
 
+type Props = {
+  autoFocus?: boolean
+  className?: string
+  cols?: number
+  defaultValue?: string
+  disabled?: boolean
+  label: string
+  name: string
+  placeholder?: string
+  required?: boolean
+  rows: number
+  showValidity?: boolean
+}
 export default function textareaFactory(styles: {
   base?: string
   touched?: string
   element?: string
   label?: string
   statusIcon?: string
-}): FunctionComponent<{
-  autoFocus?: boolean
-  className?: string
-  cols?: number
-  defaultValue?: string
-  disabled?: boolean
-  name: string
-  label: string
-  placeholder?: string
-  required?: boolean
-  showValidity?: boolean
-}> {
+}): FunctionComponent<Props> {
   if (Array.isArray(styles)) {
     styles = mergeStyles(styles)
   }
 
   const Textarea = ({
-    cols,
     autoFocus,
     className,
+    cols,
     defaultValue,
     disabled,
-    name,
     label,
+    name,
     placeholder,
     required,
     rows,
     showValidity = true,
-  }) => {
+  }: Props) => {
     const [touched, setTouched] = useState(false)
-    const textareaRef = useRef<HTMLTextAreaElement>()
+    const textareaRef = useRef<HTMLTextAreaElement>(null)
 
     const onBlur = useCallback(() => setTouched(true), [])
 
     useEffect(() => {
-      const form = textareaRef.current!.form
+      const form = textareaRef.current!.form!
       const resetTouched = setTouched.bind(null, false)
 
       form.addEventListener('reset', resetTouched)
diff --git a/client/shared/hooks/use_request_state.ts b/client/shared/hooks/use_request_state.ts
index 15bdf44..1bf4ff3 100644
--- a/client/shared/hooks/use_request_state.ts
+++ b/client/shared/hooks/use_request_state.ts
@@ -1,6 +1,13 @@
 import { useState } from 'preact/hooks'
 import isLoading from '../utils/is_loading.ts'
 
+interface State {
+  error: Error | null
+  pending: boolean
+  success: boolean
+  response: any
+}
+
 const useRequestState = () => {
   const initialState = {
     error: null,
@@ -9,7 +16,7 @@ const useRequestState = () => {
     response: null,
   }
 
-  const [state, setState] = useState(initialState)
+  const [state, setState] = useState<State>(initialState)
 
   const actions = {
     reset() {
@@ -18,7 +25,7 @@ const useRequestState = () => {
       setState(initialState)
     },
 
-    error(error) {
+    error(error: Error) {
       isLoading(false)
 
       setState({
diff --git a/client/shared/utils/disable_scroll.ts b/client/shared/utils/disable_scroll.ts
index eebfed2..c6447aa 100644
--- a/client/shared/utils/disable_scroll.ts
+++ b/client/shared/utils/disable_scroll.ts
@@ -1,6 +1,6 @@
 const scrollingElement = typeof window !== 'undefined' && (document.scrollingElement || document.documentElement)
 
-let scrollTop
+let scrollTop: number
 
 export default {
   disable() {
@@ -15,6 +15,6 @@ export default {
     document.body.style.position = ''
     document.body.style.top = ''
     document.body.style.width = ''
-    scrollingElement.scrollTop = scrollTop
+    ;(scrollingElement as Element).scrollTop = scrollTop
   },
 }
diff --git a/client/shared/utils/escape_regex.ts b/client/shared/utils/escape_regex.ts
index ffa1176..5fafc87 100644
--- a/client/shared/utils/escape_regex.ts
+++ b/client/shared/utils/escape_regex.ts
@@ -1,3 +1,3 @@
-export default function escapeRegex(string) {
+export default function escapeRegex(string: string) {
   return string.replace(/[.*+?^${}()|[\]\\]/g, '\\$&')
 }
diff --git a/client/shared/utils/is_loading.ts b/client/shared/utils/is_loading.ts
index 0d65551..e49f527 100644
--- a/client/shared/utils/is_loading.ts
+++ b/client/shared/utils/is_loading.ts
@@ -1,3 +1,3 @@
-export default (state) => {
+export default (state: boolean) => {
   document.body.classList.toggle('loading', state)
 }
diff --git a/client/shared/utils/merge_styles.ts b/client/shared/utils/merge_styles.ts
index d57b179..c33ac3b 100644
--- a/client/shared/utils/merge_styles.ts
+++ b/client/shared/utils/merge_styles.ts
@@ -9,7 +9,7 @@ export default function mergeStyles(styles: Record<string, string>[]) {
     }
   }
 
-  const obj = {}
+  const obj: Record<string, string> = {}
 
   for (const prop of props) {
     obj[prop] = cn(styles.map((style) => style[prop]))
diff --git a/client/shared/utils/serialize_form.ts b/client/shared/utils/serialize_form.ts
index be6ee92..bdae971 100644
--- a/client/shared/utils/serialize_form.ts
+++ b/client/shared/utils/serialize_form.ts
@@ -1,5 +1,5 @@
 export default function (form: HTMLFormElement, hook?: (...args: ANY[]) => ANY) {
-  const result = {}
+  const result: Record<string, string | string[]> = {}
 
   for (const element of form.elements as unknown as HTMLInputElement[]) {
     const { checked, name, type, value } = element
diff --git a/client/shared/utils/throttle.ts b/client/shared/utils/throttle.ts
index 0ee7f26..cd2a25b 100644
--- a/client/shared/utils/throttle.ts
+++ b/client/shared/utils/throttle.ts
@@ -1,10 +1,10 @@
 // copied and modified from https://github.com/sindresorhus/throttleit/blob/ed1d22c70a964ef0299d0400dbfd1fbedef56a59/index.js
 
-export default function throttle(fnc, wait) {
-  let timeout
+export default function throttle<F extends (...args: any[]) => any>(fnc: F, wait: number) {
+  let timeout: ReturnType<typeof setTimeout>
   let lastCallTime = 0
 
-  return function throttled(...args) {
+  return function throttled(...args: Parameters<F>) {
     clearTimeout(timeout)
 
     const now = Date.now()
diff --git a/client/test/jsdom_polyfills.ts b/client/test/jsdom_polyfills.ts
index f1ee51d..bdab780 100644
--- a/client/test/jsdom_polyfills.ts
+++ b/client/test/jsdom_polyfills.ts
@@ -1,5 +1,6 @@
 // modified version of: https://github.com/modosc/global-jsdom/blob/d1dd3cdeeeddd4d0653496a728e0f81e18776654/packages/global-jsdom/esm/index.mjs
 
+// @ts-ignore
 import JSDOM from 'jsdom'
 
 const html = '<!doctype html><html><head><meta charset="utf-8"></head><body></body></html>'
@@ -17,6 +18,7 @@ const { document } = window
 
 const KEYS = Object.getOwnPropertyNames(window).filter((k) => !k.startsWith('_') && !(k in globalThis))
 
+// @ts-ignore
 KEYS.forEach((key) => (globalThis[key] = window[key]))
 
 globalThis.document = document
diff --git a/package.json b/package.json
index 088d93a..3a10ac9 100644
--- a/package.json
+++ b/package.json
@@ -48,6 +48,7 @@
     "@babel/core": "^7.26.10",
     "@preact/preset-vite": "^2.10.1",
     "@testing-library/preact": "^3.2.4",
+    "@types/d3-dsv": "^3.0.7",
     "@types/lodash": "^4.17.16",
     "@types/node": "^24.10.1",
     "@typescript/native-preview": "7.0.0-dev.20251126.1",
diff --git a/pnpm-lock.yaml b/pnpm-lock.yaml
index a06a87b..fdcdac0 100644
--- a/pnpm-lock.yaml
+++ b/pnpm-lock.yaml
@@ -78,6 +78,9 @@ importers:
       '@testing-library/preact':
         specifier: ^3.2.4
         version: 3.2.4(preact@10.27.2)
+      '@types/d3-dsv':
+        specifier: ^3.0.7
+        version: 3.0.7
       '@types/lodash':
         specifier: ^4.17.16
         version: 4.17.20
@@ -924,6 +927,9 @@ packages:
   '@types/aria-query@5.0.4':
     resolution: {integrity: sha512-rfT93uj5s0PRL7EzccGMs3brplhcrghnDoV26NqKhCAS1hVo+WdNsPvE/yb6ilfr5hi2MEk6d5EWJTKdxg8jVw==}
 
+  '@types/d3-dsv@3.0.7':
+    resolution: {integrity: sha512-n6QBF9/+XASqcKK6waudgL0pf/S5XHPPI8APyMLLUHd8NqouBGLsU8MgtO7NINGtPBtk9Kko/W4ea0oAspwh9g==}
+
   '@types/estree@1.0.8':
     resolution: {integrity: sha512-dWHzHa2WqEXI/O1E9OjrocMTKJl2mSrEolh1Iomrv6U+JuNwaHXsXx9bLu5gG7BUWFIN0skIQJQ/L1rIex4X6w==}
 
@@ -2949,6 +2955,8 @@ snapshots:
 
   '@types/aria-query@5.0.4': {}
 
+  '@types/d3-dsv@3.0.7': {}
+
   '@types/estree@1.0.8': {}
 
   '@types/lodash@4.17.20': {}
diff --git a/server/env.ts b/server/env.ts
index e86015d..49bb7dc 100644
--- a/server/env.ts
+++ b/server/env.ts
@@ -1,32 +1,26 @@
-const evals = ['false', 'true', 'null', 'undefined']
-const numberRegex = /^\d+$/
+function read<
+  const C extends readonly string[],
+  D extends Partial<Record<C[number], any>> & Record<Exclude<keyof D, C[number]>, never> = {},
+>(columns: C, defaults: D): Record<C[number], any> {
+  const missing: string[] = []
 
-export function read(columns, defaults = {}) {
-  columns = [...new Set(columns.concat(Object.keys(defaults)))].sort()
+  const result: Record<string, any> = {}
 
-  const missing = []
-
-  const result = columns.reduce((result, variable) => {
-    /* eslint-disable-next-line n/no-process-env */
-    let value = process.env[variable] || defaults[variable]
+  for (const column of columns) {
+    let value: string | number | boolean | null | undefined = process.env[column]
 
     if (value === undefined) {
-      missing.push(variable)
+      value = defaults[column as keyof D] ?? null
+      missing.push(column)
     } else {
       if (typeof value === 'string') {
-        if (numberRegex.test(value)) {
-          value = Number.parseInt(value)
-        } else if (evals.includes(value)) {
-          // eslint-disable-next-line no-eval
-          value = eval(value)
-        }
+        if (/^\d+$/.test(value)) value = Number(value)
+        else if (['false', 'true', 'null', 'undefined'].includes(value)) value = eval(value)
       }
-
-      result[variable] = value
     }
 
-    return result
-  }, {})
+    result[column] = value
+  }
 
   if (missing.length) {
     throw new Error(`Missing required env variables: ${missing.join(', ')}`)
@@ -52,7 +46,7 @@ export default read(
     'PGPORT',
     'PGUSER',
     'REDIS_HOST',
-  ],
+  ] as const,
   {
     PGPASSWORD: null,
     PGPORT: null,
diff --git a/server/handlers/error.ts b/server/handlers/error.ts
index 7acc565..28deeb8 100644
--- a/server/handlers/error.ts
+++ b/server/handlers/error.ts
@@ -1,12 +1,13 @@
 import { DatabaseError } from 'pg-protocol'
 import StatusError from '../lib/status_error.ts'
+import { type ErrorHandler } from '../types.ts'
 
-const databaseErrorCodes = {
+const databaseErrorCodes: Record<string, number> = {
   23505: 409,
   23514: 409,
 }
 
-function defaultHandler(error, request, reply) {
+const defaultHandler: ErrorHandler = (error, _request, reply) => {
   return reply
     .type('text/html')
     .send(
@@ -14,21 +15,24 @@ function defaultHandler(error, request, reply) {
     )
 }
 
-export default function ErrorHandler(handler = defaultHandler) {
+export default function createErrorHandler(handler: ErrorHandler = defaultHandler): ErrorHandler {
   return async function errorHandler(error, request, reply) {
-    if (error instanceof DatabaseError && error.code in databaseErrorCodes) {
+    if (error instanceof DatabaseError && error.code && error.code in databaseErrorCodes) {
       error = new StatusError(databaseErrorCodes[error.code], error.detail || 'Database Error', { cause: error })
     }
 
     reply.log.error({ req: request, err: error }, error?.message)
 
+    // @ts-ignore
     reply.status(error.status || error.statusCode || 500)
 
     if (request.headers.accept?.includes('application/json')) {
       return reply.send(
+        // @ts-ignore
         error.toJSON?.() || {
           name: error.name,
           message: error.message,
+          // @ts-ignore
           status: error.status || error.statusCode || 500,
         },
       )
diff --git a/server/handlers/robots.ts b/server/handlers/robots.ts
index 13826d9..0561f35 100644
--- a/server/handlers/robots.ts
+++ b/server/handlers/robots.ts
@@ -1,3 +1,4 @@
+import type { RouteHandler } from 'fastify'
 import env from '../env.ts'
 
 const CONTENT = {
@@ -11,8 +12,10 @@ Disallow: /admin
 `,
 }
 
-const contents = (CONTENT[env.NODE_ENV] || CONTENT.development).trim()
+const contents = (CONTENT[env.NODE_ENV as 'development' | 'production'] || CONTENT.development).trim()
 
-export default function robots(_request, reply) {
+const robots: RouteHandler = (_request, reply) => {
   return reply.type('text/plain').send(contents)
 }
+
+export default robots
diff --git a/server/lib/console.ts b/server/lib/console.ts
index 0d64d07..918b24a 100644
--- a/server/lib/console.ts
+++ b/server/lib/console.ts
@@ -2,6 +2,7 @@ import env from '../env.ts'
 
 if (env.NODE_ENV === 'development') {
   // output filename in console log and colour console.dir
+  // @ts-ignore
   await import('@bmp/console').then((mod) => mod.default({ log: true, error: true, dir: true }))
 
   const { default: chalk } = await import('chalk')
diff --git a/server/lib/html.ts b/server/lib/html.ts
index dc5836c..28c15cd 100644
--- a/server/lib/html.ts
+++ b/server/lib/html.ts
@@ -2,9 +2,9 @@ import { Readable } from 'node:stream'
 
 type ExpressionPrimitives = string | number | Date | boolean | undefined | null | ExpressionPrimitives[]
 
-type Expression = ExpressionPrimitives | (() => ExpressionPrimitives) | Promise<ExpressionPrimitives>
+type Expression = ExpressionPrimitives | (() => ExpressionPrimitives) | Promise<Expression>
 
-type ParseGenerator = Generator<ExpressionPrimitives, void>
+type ParseGenerator = Generator<ExpressionPrimitives | Promise<ExpressionPrimitives>, void>
 
 export interface Template {
   generator: (minify?: boolean) => ParseGenerator
@@ -14,16 +14,17 @@ export interface Template {
 
 const cache = new WeakMap()
 
-function apply(expression: Expression) {
-  if (!expression) {
+function apply(expression: Expression): ExpressionPrimitives | Promise<ExpressionPrimitives> {
+  if (expression == null) {
     return ''
-  } else if ((expression as Promise<ExpressionPrimitives>).then) {
-    return (expression as Promise<ExpressionPrimitives>).then(apply)
+  } else if (expression instanceof Promise) {
+    return expression.then((resolved) => apply(resolved))
   } else if (typeof expression === 'function') {
     return apply(expression())
-  } else {
-    return (expression as ExpressionPrimitives[]).join?.('') ?? expression
+  } else if (Array.isArray(expression)) {
+    return expression.join('')
   }
+  return expression
 }
 
 function* parse(strings: TemplateStringsArray, expressions: Expression[], minify?: boolean): ParseGenerator {
@@ -67,8 +68,8 @@ function stream(generator: ParseGenerator) {
 async function text(generator: ParseGenerator) {
   let result = ''
 
-  for await (const chunk of generator) {
-    result += chunk
+  for (const chunk of generator) {
+    result += chunk instanceof Promise ? await chunk : chunk
   }
 
   return result
diff --git a/server/lib/knex.ts b/server/lib/knex.ts
index 0b2e5d2..1c5c796 100644
--- a/server/lib/knex.ts
+++ b/server/lib/knex.ts
@@ -1,6 +1,6 @@
 import _ from 'lodash'
-// eslint-disable-next-line import/no-named-as-default
 import knex from 'knex'
+// @ts-ignore
 import pg from 'pg'
 import env from '../env.ts'
 
@@ -8,8 +8,8 @@ const queryProto = pg.Query.prototype
 
 const handleRowDescription = queryProto.handleRowDescription
 
-queryProto.handleRowDescription = function (msg) {
-  msg.fields.forEach((field) => {
+queryProto.handleRowDescription = function (msg: { fields: { name: string }[] }) {
+  msg.fields.forEach((field: { name: string }) => {
     field.name = _.camelCase(field.name)
   })
 
diff --git a/server/lib/parse_line.test.ts b/server/lib/parse_line.test.ts
index d77b01a..9797209 100644
--- a/server/lib/parse_line.test.ts
+++ b/server/lib/parse_line.test.ts
@@ -110,9 +110,18 @@ test('parseSRU', (t: TestContext) => {
 })
 
 test('parseTrans', (t: TestContext) => {
+  type Expected = {
+    accountNumber: number
+    objectList: [number, number][] | null
+    amount: number
+    transactionDate: string | null
+    description: string | null
+    quantity: number | null
+    signature: null
+  }
   // Fortnox 3.57.11
   let line = '#TRANS 1790 {1 "1"} 7509 "" "Faktura 9631584500436 172-57 - Perspektiv Bredband AB" 0'
-  let expected = {
+  let expected: Expected = {
     accountNumber: 1790,
     objectList: [[1, 1]],
     amount: 7509,
diff --git a/server/lib/parse_line.ts b/server/lib/parse_line.ts
index f00cd0b..6581ec6 100644
--- a/server/lib/parse_line.ts
+++ b/server/lib/parse_line.ts
@@ -3,7 +3,14 @@
 const rDim = /#DIM\s+(-?\d+)\s+"([^"]*)"$/
 
 export function parseDim(line: string) {
-  const [, number, name] = line.match(rDim)
+  const result = line.match(rDim)
+
+  if (!result) {
+    console.error(line)
+    throw Error('parsing error')
+  }
+
+  const [, number, name] = result
 
   return {
     number: parseInt(number),
@@ -30,7 +37,7 @@ export function parseIB(line: string) {
     accountNumber: parseInt(accountNumber),
     yearNumber: parseInt(yearNumber),
     balance: parseFloat(balance),
-    quantity: parseInt(quantity),
+    quantity: quantity ? parseInt(quantity) : null,
   }
 }
 
@@ -45,7 +52,7 @@ export function parseKonto(line: string) {
     throw Error('parsing error')
   }
 
-  const [, number, description] = line.match(rKonto)
+  const [, number, description] = result
 
   return {
     number: parseInt(number),
@@ -58,7 +65,14 @@ export function parseKonto(line: string) {
 const rObjekt = /^#OBJEKT\s+(\d+)\s+"?(\d+)"?\s"([^"]*)"$/
 
 export function parseObjekt(line: string) {
-  const [, dimensionNumber, number, name] = line.match(rObjekt)
+  const result = line.match(rObjekt)
+
+  if (!result) {
+    console.error(line)
+    throw Error('parsing error')
+  }
+
+  const [, dimensionNumber, number, name] = result
 
   return {
     dimensionNumber: parseInt(dimensionNumber),
@@ -73,7 +87,14 @@ export function parseObjekt(line: string) {
 const rRAR = /^#RAR\s+(-?\d+)\s+(\d{8,8})\s+(\d{8,8})$/
 
 export function parseRAR(line: string) {
-  const [, yearNumber, startDate, endDate] = line.match(rRAR)
+  const result = line.match(rRAR)
+
+  if (!result) {
+    console.error(line)
+    throw Error('parsing error')
+  }
+
+  const [, yearNumber, startDate, endDate] = result
 
   return {
     yearNumber: parseInt(yearNumber),
@@ -87,7 +108,14 @@ export function parseRAR(line: string) {
 const rSRU = /^#SRU\s+(\d{4,4})\s+(\d{4,4})$/
 
 export function parseSRU(line: string) {
-  const [, number, sru] = line.match(rSRU)
+  const result = line.match(rSRU)
+
+  if (!result) {
+    console.error(line)
+    throw Error('parsing error')
+  }
+
+  const [, number, sru] = result
 
   return {
     number: parseInt(number),
@@ -112,16 +140,16 @@ export function parseTrans(line: string) {
 
   const [, accountNumber, objectListString, amount, transactionDate, description, quantity, signature] = result
 
-  let objectList = null
+  let objectList: [number, number][] | null = null
 
   if (objectListString) {
     objectList = []
     const result = objectListString.matchAll(rObjectList)
 
     for (const match of result) {
-      const [, dimension, object] = match
+      const [, dimension, object] = match as string[]
 
-      objectList.push([dimension, object].map((val) => parseInt(val)))
+      objectList.push([dimension, object].map((val) => parseInt(val)) as [number, number])
     }
   }
 
@@ -164,7 +192,14 @@ export function parseUB(line: string) {
 const rVer = /#VER\s+(\w+)\s+(\d+)\s+(\d{8,8})\s+"([^"]*)"\s+(\d{8,8})(?:\s+(.*))?/
 
 export function parseVer(line: string) {
-  const [, journal, number, transactionDate, description, entryDate, signature] = line.match(rVer)
+  const result = line.match(rVer)
+
+  if (!result) {
+    console.error(line)
+    throw Error('parsing error')
+  }
+
+  const [, journal, number, transactionDate, description, entryDate, signature] = result
 
   return {
     journal,
diff --git a/server/lib/parse_stream.ts b/server/lib/parse_stream.ts
index df85492..98915c5 100644
--- a/server/lib/parse_stream.ts
+++ b/server/lib/parse_stream.ts
@@ -1,4 +1,4 @@
-import { type ReadableStream } from 'node:stream/web'
+import type { ReadableStream } from 'stream/web'
 import knex from './knex.ts'
 
 import split, { type Decoder } from './split.ts'
@@ -41,7 +41,7 @@ export default async function parseStream(stream: ReadableStream, decoder: Decod
   const journals = new Map()
 
   let currentEntry: { id: number; description: string }
-  let currentInvoiceId: number
+  let currentInvoiceId: number | null
   let currentYear = null
   const details: Record<string, string> = {}
 
@@ -214,25 +214,27 @@ export default async function parseStream(stream: ReadableStream, decoder: Decod
             }
 
             invoiceId = (
-              await trx('invoice').insert({ financialYearId: currentYear.id, fiskenNumber, supplierId }).returning('id')
+              await trx('invoice')
+                .insert({ financialYearId: currentYear!.id, fiskenNumber, supplierId })
+                .returning('id')
             )[0]?.id
           }
 
-          if (transaction.accountNumber === 2441 && currentEntry.description?.includes('Fakturajournal')) {
+          if (transaction.accountNumber === 2441 && currentEntry!.description?.includes('Fakturajournal')) {
             await trx('invoice').update('amount', Math.abs(transaction.amount)).where('id', invoiceId)
           }
         }
 
-        if (invoiceId && currentInvoiceId) {
+        if (invoiceId! && currentInvoiceId!) {
           throw new Error('invoiceId and currentInvoiceId')
         }
 
         const transactionId = (
           await trx('transaction')
             .insert({
-              entryId: currentEntry.id,
+              entryId: currentEntry!.id,
               ...transaction,
-              invoiceId: invoiceId || currentInvoiceId,
+              invoiceId: invoiceId! || currentInvoiceId!,
             })
             .returning('id')
         )[0].id
@@ -269,11 +271,11 @@ export default async function parseStream(stream: ReadableStream, decoder: Decod
 
         const existingAccountBalance = await trx('accountBalance')
           .first('*')
-          .where({ financialYearId: currentYear.id, accountNumber })
+          .where({ financialYearId: currentYear!.id, accountNumber })
 
         if (!existingAccountBalance) {
           await trx('accountBalance').insert({
-            financialYearId: currentYear.id,
+            financialYearId: currentYear!.id,
             accountNumber,
             out: balance,
             outQuantity: quantity,
@@ -285,7 +287,7 @@ export default async function parseStream(stream: ReadableStream, decoder: Decod
               outQuantity: quantity,
             })
             .where({
-              financialYearId: currentYear.id,
+              financialYearId: currentYear!.id,
               accountNumber,
             })
         }
diff --git a/server/lib/pino_transport_console.ts b/server/lib/pino_transport_console.ts
index 8328136..6d0e480 100644
--- a/server/lib/pino_transport_console.ts
+++ b/server/lib/pino_transport_console.ts
@@ -1,9 +1,10 @@
 import util from 'node:util'
 import chalk from 'chalk'
 import _ from 'lodash'
+// @ts-ignore
 import highlightStack from '@bmp/highlight-stack'
 
-const LEVELS = {
+const LEVELS: Record<string, string> = {
   default: 'USERLVL',
   60: 'FATAL',
   50: 'ERROR',
@@ -13,7 +14,7 @@ const LEVELS = {
   10: 'TRACE',
 }
 
-const COLORS = {
+const COLORS: Record<string, any> = {
   60: chalk.bgRed,
   50: chalk.red,
   40: chalk.yellow,
@@ -24,7 +25,7 @@ const COLORS = {
 
 const requests = new Map()
 
-function colorStatusCode(statusCode) {
+function colorStatusCode(statusCode: number) {
   if (statusCode < 300) {
     return chalk.bold.green(statusCode)
   } else if (statusCode < 400) {
@@ -36,30 +37,56 @@ function colorStatusCode(statusCode) {
   }
 }
 
+interface BaseLineObject {
+  level: number
+  time: number
+  pid: number
+  reqId: string
+  msg: string
+}
+
+interface ErrorLineObject extends BaseLineObject {
+  level: 50
+  err: ANY
+}
+
+interface IncomingRequestLineObject extends BaseLineObject {
+  msg: 'incoming request'
+  req: Record<string, any>
+}
+
+interface RequestCompletedLineObject extends BaseLineObject {
+  msg: 'request completed'
+  res: Record<string, any>
+  responseTime: number
+}
+
+type LineObject = ErrorLineObject | IncomingRequestLineObject | RequestCompletedLineObject | BaseLineObject
+
 export default {
-  write(line) {
-    const obj = JSON.parse(line)
+  write(line: string) {
+    const obj: LineObject = JSON.parse(line)
 
     if (obj.msg === 'incoming request') {
-      requests.set(obj.reqId, obj.req)
+      requests.set(obj.reqId, (obj as IncomingRequestLineObject).req)
     } else if (obj.msg === 'request completed') {
       const req = requests.get(obj.reqId)
       requests.delete(obj.reqId)
       process.stdout.write(
-        `${chalk.bold(req.method)} ${req.url} ${colorStatusCode(obj.res.statusCode)} ${obj.responseTime.toFixed(
-          3,
-        )} ms\n`,
+        `${chalk.bold(req.method)} ${req.url} ${colorStatusCode((obj as RequestCompletedLineObject).res.statusCode)} ${(
+          obj as RequestCompletedLineObject
+        ).responseTime.toFixed(3)} ms\n`,
       )
     } else if (obj.level === 50) {
       // TODO figure out if there is a way to get the error instances here... console.log(Error) and util.inspect(Error)
       // looks better than the serialized errors
-      if (obj.err.status < 500) return
+      if ((obj as ErrorLineObject).err.status < 500) return
 
       process.stdout.write(
-        `${COLORS[obj.level](LEVELS[obj.level] || LEVELS.default)} ${highlightStack(obj.err.stack)}\n`,
+        `${COLORS[obj.level](LEVELS[obj.level] || LEVELS.default)} ${highlightStack((obj as ErrorLineObject).err.stack)}\n`,
       )
 
-      const details = _.omit(obj.err, ['type', 'message', 'stack'])
+      const details = _.omit((obj as ErrorLineObject).err, ['type', 'message', 'stack'])
 
       if (!_.isEmpty(details)) {
         process.stdout.write(`${chalk.red('Details')} ${util.inspect(details, false, 4, true)}\n`)
diff --git a/server/lib/split.ts b/server/lib/split.ts
index f90c06d..6dbc6c3 100644
--- a/server/lib/split.ts
+++ b/server/lib/split.ts
@@ -1,17 +1,19 @@
+import { TransformStream } from 'stream/web'
+
 const defaultMatcher = /\r?\n/
 
 export type Decoder = {
-  decode: (chunk?: ArrayBufferView) => void
+  decode: (chunk: Uint8Array) => string
 }
 
 interface Options {
   decoder?: Decoder
 }
 
-export default function split(matcher: RegExp, { decoder }: Options = {}) {
+export default function split(matcher?: RegExp | null, { decoder }: Options = {}) {
   matcher ??= defaultMatcher
 
-  let rest: string | null = null
+  let rest: string | null | undefined = null
 
   return new TransformStream({
     start() {},
diff --git a/server/plugins/vite.ts b/server/plugins/vite.ts
index 68606fa..f8869f4 100644
--- a/server/plugins/vite.ts
+++ b/server/plugins/vite.ts
@@ -1,35 +1,7 @@
 import { type FastifyPluginCallback } from 'fastify'
 import _ from 'lodash'
 import fp from 'fastify-plugin'
-import { type Template } from '../lib/html.ts'
-
-export interface Entry {
-  name: string
-  path: string
-  template: (...args: any[]) => Template
-  routes?: ANY[]
-  ssr?: boolean
-  hostname?: string
-  ctx?: Record<string, any>
-  setupRebuildCache?: (buildCache: () => any) => any
-  preHandler?: ANY
-  createPreHandler?: (route: ANY, entry: Entry) => any
-  createErrorHandler?: (handler?: ANY) => ANY
-}
-
-export type EntryWithoutName = Omit<Entry, 'name'>
-
-export interface Config {
-  mode: 'development' | 'production'
-  createPreHandler?: (route: ANY, entry: Entry) => any
-  createErrorHandler?: (handler?: ANY) => ANY
-  entries: Record<string, EntryWithoutName>
-}
-
-export interface ParsedConfig {
-  mode: 'development' | 'production'
-  entries: Entry[]
-}
+import type { Config, Entry, EntryWithoutName } from './vite/types.ts'
 
 const vitePlugin: FastifyPluginCallback<Config> = async function (fastify, config) {
   const parsedConfig = {
diff --git a/server/plugins/vite/development.ts b/server/plugins/vite/development.ts
index 8557111..c30ab24 100644
--- a/server/plugins/vite/development.ts
+++ b/server/plugins/vite/development.ts
@@ -1,9 +1,10 @@
-import { type FastifyInstance } from 'fastify'
+import type { FastifyInstance, RouteHandler } from 'fastify'
 import fmiddie from '@fastify/middie'
 import { createServer } from 'vite'
 import StatusError from '../../lib/status_error.ts'
 
-import { type Entry, type ParsedConfig } from '../vite.ts'
+import type { Route } from '../../../shared/types.ts'
+import type { Entry, ParsedConfig, Renderer, RenderFunction } from './types.ts'
 
 export default async function viteDevelopment(fastify: FastifyInstance, config: ParsedConfig) {
   const devServer = await createServer({
@@ -40,7 +41,7 @@ async function setupEntry(fastify: FastifyInstance, entry: Entry) {
   if (entry.preHandler) {
     fastify.addHook('preHandler', entry.preHandler)
   }
-  const routes = entry.routes || (await fastify.devServer.ssrLoadModule(`/${entry.name}/server.ts`)).routes
+  const routes: Route[] = entry.routes || (await fastify.devServer.ssrLoadModule(`/${entry.name}/server.ts`)).routes
 
   for (const route of routes.flatMap((route) => route.routes || route)) {
     // const preHandler = entry.preHandler || entry.createPreHandler?.(route, entry)
@@ -79,28 +80,32 @@ async function setupEntry(fastify: FastifyInstance, entry: Entry) {
     throw new StatusError(404)
   })
 
-  fastify.setErrorHandler(
-    entry.createErrorHandler(async (error, request, reply) => {
-      reply.type('text/html').status(error.status || 500)
+  if (entry.createErrorHandler) {
+    fastify.setErrorHandler(
+      entry.createErrorHandler(async (error, request, reply) => {
+        reply.type('text/html').status((error as StatusError).status || 500)
 
-      return renderer(
-        request.url,
-        Object.assign(
-          {
-            error,
-          },
-          reply.ctx,
-        ),
-      )
-    }),
-  )
+        return renderer(
+          request.url,
+          Object.assign(
+            {
+              error,
+            },
+            reply.ctx,
+          ),
+        )
+      }),
+    )
+  }
 }
 
-function createRenderer(fastify, entry) {
+function createRenderer(fastify: FastifyInstance, entry: Entry): Renderer {
   return async (url, ctx) => {
     ctx = Object.assign({ url }, entry.ctx, ctx)
 
-    const { render } = await fastify.devServer.ssrLoadModule(`/${entry.name}/server.ts`)
+    const { render } = (await fastify.devServer.ssrLoadModule(`/${entry.name}/server.ts`)) as {
+      render?: RenderFunction
+    }
 
     const renderPromise = render && entry.ssr !== false ? render(ctx) : null
 
@@ -121,7 +126,7 @@ function createRenderer(fastify, entry) {
   }
 }
 
-function createHandler(renderer) {
+function createHandler(renderer: Renderer): RouteHandler {
   return async function handler(request, reply) {
     reply.type('text/html')
 
diff --git a/server/plugins/vite/production.ts b/server/plugins/vite/production.ts
index b44d62d..9854d9a 100644
--- a/server/plugins/vite/production.ts
+++ b/server/plugins/vite/production.ts
@@ -1,12 +1,14 @@
-import { type FastifyInstance } from 'fastify'
-
 import path from 'node:path'
 import fs from 'node:fs'
+import { type Readable } from 'node:stream'
+import { resolveConfig, type ResolvedConfig as ViteResolvedConfig, type Manifest as ViteManifest } from 'vite'
+import type { FastifyInstance, RouteHandler } from 'fastify'
 import fstatic from '@fastify/static'
-import { resolveConfig } from 'vite'
+
 import StatusError from '../../lib/status_error.ts'
 
-import { type Entry, type ParsedConfig } from '../vite.ts'
+import type { Route } from '../../../shared/types.ts'
+import type { Entry, ParsedConfig, Renderer, RenderCache, RenderFunction, ViteEntryFile } from './types.ts'
 
 export default async function viteProduction(fastify: FastifyInstance, config: ParsedConfig) {
   const viteConfig = await resolveConfig({}, 'build', 'production')
@@ -25,18 +27,27 @@ export default async function viteProduction(fastify: FastifyInstance, config: P
   }
 }
 
-async function setupEntry(fastify: FastifyInstance, entry: Entry, config: ParsedConfig, viteConfig) {
-  const viteFilePath = path.join(viteConfig.build.outDir, entry.name + '.js')
-  const viteFile = fs.existsSync(viteFilePath)
-    ? await import(viteFilePath)
+async function setupEntry(
+  fastify: FastifyInstance,
+  entry: Entry,
+  _config: ParsedConfig,
+  viteConfig: ViteResolvedConfig,
+) {
+  const viteEntryFilePath = path.join(viteConfig.build.outDir, entry.name + '.js')
+  const viteEntryFile: ViteEntryFile = fs.existsSync(viteEntryFilePath)
+    ? await import(viteEntryFilePath)
     : await import(path.join(viteConfig.root, entry.name, 'server.ts'))
   const manifestPath = path.join(viteConfig.build.outDir, `manifest.${entry.name}.json`)
-  const manifest = fs.existsSync(manifestPath) ? (await import(manifestPath, { with: { type: 'json' } })).default : null
-  const routes = entry.routes || viteFile.routes
+  const manifest: ViteManifest = fs.existsSync(manifestPath)
+    ? (await import(manifestPath, { with: { type: 'json' } })).default
+    : null
+  const routes = entry.routes || viteEntryFile.routes
+
+  if (!routes) throw new Error('No routes found')
 
   const cache = new Map()
 
-  const renderer = createRenderer(fastify, entry, viteFile.render, manifest)
+  const renderer = createRenderer(fastify, entry, viteEntryFile.render, manifest)
   const cachedHandler = createCachedHandler(cache)
   const handler = createHandler(renderer)
 
@@ -90,24 +101,31 @@ async function setupEntry(fastify: FastifyInstance, entry: Entry, config: Parsed
     throw new StatusError(404)
   })
 
-  fastify.setErrorHandler(
-    entry.createErrorHandler(async (error, request, reply) => {
-      reply.type('text/html').status(error.status || 500)
+  if (entry.createErrorHandler) {
+    fastify.setErrorHandler(
+      entry.createErrorHandler(async (error, request, reply) => {
+        reply.type('text/html').status((error as StatusError).status || 500)
 
-      return renderer(
-        request.url,
-        Object.assign(
-          {
-            error,
-          },
-          reply.ctx,
-        ),
-      )
-    }),
-  )
+        return renderer(
+          request.url,
+          Object.assign(
+            {
+              error,
+            },
+            reply.ctx,
+          ),
+        )
+      }),
+    )
+  }
 }
 
-function createRenderer(fastify, entry, render, manifest) {
+function createRenderer(
+  _fastify: FastifyInstance,
+  entry: Entry,
+  render: RenderFunction | null | undefined,
+  manifest: ViteManifest,
+): Renderer {
   const files = manifest[`${entry.name}/client.ts`]
   const bundle = path.join('/', files.file)
   const preload = files.imports?.map((name) => path.join('/', manifest[name].file))
@@ -124,7 +142,7 @@ function createRenderer(fastify, entry, render, manifest) {
         script: bundle,
         preload,
         css,
-        content: renderPromise?.then((result) => result.content),
+        content: renderPromise?.then((result) => result.html),
         head: renderPromise?.then((result) => result.head),
         state: renderPromise?.then((result) => result.state) || Promise.resolve(ctx),
       })
@@ -132,7 +150,7 @@ function createRenderer(fastify, entry, render, manifest) {
   }
 }
 
-function createHandler(renderer) {
+function createHandler(renderer: Renderer): RouteHandler {
   return async function handler(request, reply) {
     reply.type('text/html')
 
@@ -140,7 +158,7 @@ function createHandler(renderer) {
   }
 }
 
-function createCachedHandler(cache) {
+function createCachedHandler(cache: RenderCache): RouteHandler {
   return function cachedHandler(request, reply) {
     reply.type('text/html')
 
@@ -148,13 +166,13 @@ function createCachedHandler(cache) {
   }
 }
 
-async function buildCache(entry, routes, renderer, cache) {
+async function buildCache(_entry: Entry, routes: Route[], renderer: Renderer, cache: RenderCache) {
   for (const route of routes) {
     if (route.cache) {
       let html = ''
 
       // TODO run preHandlers
-      for await (const chunk of renderer(route.path)) {
+      for await (const chunk of renderer(route.path) as Readable) {
         html += chunk
       }
 
diff --git a/server/plugins/vite/types.ts b/server/plugins/vite/types.ts
new file mode 100644
index 0000000..2d6392d
--- /dev/null
+++ b/server/plugins/vite/types.ts
@@ -0,0 +1,56 @@
+import type { Readable } from 'node:stream'
+import type { preHandlerHookHandler } from 'fastify'
+import type { Template } from '../../lib/html.ts'
+import type { ErrorHandler } from '../../types.ts'
+import type { Route } from '../../../shared/types.ts'
+
+export interface Config {
+  mode: 'development' | 'production'
+  createPreHandler?: (route: Route, entry: Entry) => preHandlerHookHandler
+  createErrorHandler?: (handler?: ErrorHandler) => ErrorHandler
+  entries: Record<string, EntryWithoutName>
+}
+
+export interface ParsedConfig {
+  mode: 'development' | 'production'
+  entries: Entry[]
+}
+
+export interface Entry {
+  name: string
+  path: string
+  template: (...args: any[]) => Template
+  routes?: Route[]
+  ssr?: boolean
+  hostname?: string
+  ctx?: Record<string, any>
+  setupRebuildCache?: (buildCache: () => any) => any
+  preHandler?: preHandlerHookHandler
+  createPreHandler?: (route: Route, entry: Entry) => preHandlerHookHandler
+  createErrorHandler?: (handler?: ErrorHandler) => ErrorHandler
+}
+
+export type EntryWithoutName = Omit<Entry, 'name'>
+
+export type RenderCache = Map<string, string>
+
+export interface RenderFunctionResult {
+  html?: string
+  head: {
+    title?: string
+    tags?: {
+      type: string
+      tags: Record<string, string>
+    }
+  }
+  state: Record<string, any>
+}
+
+export type RenderFunction = (ctx: ANY) => Promise<RenderFunctionResult>
+
+export type Renderer = (url: string, ctx?: ANY) => string | Promise<string> | Readable
+
+export interface ViteEntryFile {
+  routes?: Route[]
+  render?: RenderFunction
+}
diff --git a/server/templates/public.ts b/server/templates/public.ts
index 70f83e6..2b4195e 100644
--- a/server/templates/public.ts
+++ b/server/templates/public.ts
@@ -1,6 +1,21 @@
 import html from '../lib/html.ts'
 
-export default ({ content, css, head, preload, script, state }) => html`<!DOCTYPE html>
+interface Options {
+  content: string
+  css: string[]
+  head: Promise<{
+    title?: string
+    tags?: {
+      type: string
+      attributes: Record<string, string>
+    }[]
+  }>
+  preload?: string[]
+  script: string
+  state: Promise<Record<string, any>>
+}
+
+export default ({ content, css, head, preload, script, state }: Options) => html`<!DOCTYPE html>
 <html lang='sv-SE'>
   <head>
     <link rel="icon" href="/favicon.svg" />
diff --git a/server/types.ts b/server/types.ts
new file mode 100644
index 0000000..0ffcb56
--- /dev/null
+++ b/server/types.ts
@@ -0,0 +1,10 @@
+import { type FastifyRequest, type FastifyReply } from 'fastify'
+
+import { type DatabaseError } from 'pg-protocol'
+import type StatusError from './lib/status_error.ts'
+
+export type ErrorHandler = (
+  error: Error | DatabaseError | StatusError,
+  request: FastifyRequest,
+  reply: FastifyReply,
+) => any | Promise<any>
diff --git a/shared/global.d.ts b/shared/global.d.ts
index f177668..7ff4d1c 100644
--- a/shared/global.d.ts
+++ b/shared/global.d.ts
@@ -20,7 +20,7 @@ declare module 'fastify' {
   }
 
   interface FastifyReply {
-    ctx: { [key: string]: any }
+    ctx: Record<string, any> | null
   }
 }
 
diff --git a/shared/types.ts b/shared/types.ts
index 067481f..14add25 100644
--- a/shared/types.ts
+++ b/shared/types.ts
@@ -1,15 +1,14 @@
-// export const FinancialYear = Type.Object({
-//   year: Type.Number(),
-//   startDate: Type.String(),
-//   endDate: Type.String(),
-// })
-
-// export type FinancialYearType = Static<typeof FinancialYear>
-export interface Transaction {
+export type Account = {
+  id: number
+  number: number
   description: string
-  amount: number
 }
 
+export type Balance = {
+  accountNumber: string
+  description: string
+} & Record<number, number>
+
 export interface Entry {
   id: number
   journal: string
@@ -24,3 +23,71 @@ export interface Entry {
     amount: number
   }[]
 }
+
+export type FinancialYear = {
+  year: number
+  startDate: string
+  endDate: string
+}
+
+export type Invoice = {
+  id: number
+  fiskenNumber?: number
+  phmNumber?: number
+  invoiceDate: string
+  dueDate: string
+  invoiceNumber: number
+  amount: number
+  files?: { filename: string }[]
+  transactions?: {
+    account_number: number
+    amount: number
+    description: number
+    entry_id: number
+  }[]
+}
+
+export type Journal = {
+  id: number
+  identifier: string
+}
+
+export type Object = {
+  id: number
+  dimensionName: string
+  name: string
+}
+
+export type Result = {
+  accountNumber: number
+  description?: string
+} & Record<number, number>
+
+export type Supplier = {
+  id: number
+  name: string
+}
+
+export interface Transaction {
+  accountNumber: number
+  description: string
+  amount: number
+  entryId: number
+}
+
+export interface TransactionFull extends Transaction {
+  transactionDate: string
+  invoiceId: number
+  entryDescription: string
+}
+
+export interface Route {
+  path: string
+  name: string
+  title: string
+  component: (args: ANY) => ANY
+  cache?: boolean
+  nav?: boolean
+  routes?: Route[]
+  locales?: ANY[]
+}
diff --git a/tsconfig.json b/tsconfig.json
index d0ae0d4..be7f1a0 100644
--- a/tsconfig.json
+++ b/tsconfig.json
@@ -1,5 +1,6 @@
 {
   "compilerOptions": {
+    "strict": true,
     "noEmit": true,
     "target": "esnext",
     "jsx": "react-jsx",