diff --git a/index.ts b/index.ts
index 2ec52c9..8eac922 100644
--- a/index.ts
+++ b/index.ts
@@ -2,7 +2,7 @@ import fs from 'fs'
 import path from 'path'
 import http from 'http'
 
-const serve404 = require('./libs/serve-404.js')
+import serve404 from './libs/serve-404'
 
 const badgeHandlers = fs.readdirSync(path.join(__dirname, 'endpoints'))
   .filter(name => !name.startsWith('_'))
diff --git a/libs/badgen-serve.ts b/libs/badgen-serve.ts
index 99749fb..64fe0eb 100644
--- a/libs/badgen-serve.ts
+++ b/libs/badgen-serve.ts
@@ -4,11 +4,7 @@ import PathParser from 'path-parser'
 import serve404 from './serve-404.js'
 import serveBadge from './serve-badge.js'
 
-export type BadgenParams = {
-  subject: string
-  status: string
-  color: string
-}
+import { BadgenParams } from './types'
 
 export type BadgenServeHandlerArgs = { [key: string]: string }
 export type BadgenServeHandler = (args: BadgenServeHandlerArgs) => Promise<BadgenParams>
diff --git a/libs/serve-badge.js b/libs/serve-badge.ts
similarity index 59%
rename from libs/serve-badge.js
rename to libs/serve-badge.ts
index 9a57abd..313cfc2 100644
--- a/libs/serve-badge.js
+++ b/libs/serve-badge.ts
@@ -1,10 +1,16 @@
-const badgen = require('badgen')
-const { send } = require('micro')
-const icons = require('badgen-icons')
+import badgen from 'badgen'
+import icons from 'badgen-icons'
 
-const CACHE_CONTROL = `public, max-age=10, stale-while-revalidate=604800, stale-if-error=604800`
+import { BadgenParams } from './types'
 
-module.exports = (req, res, options = {}) => {
+type ServeBadgeOptions = {
+  code?: number
+  sMaxAge?: number,
+  query?: { [key: string]: any },
+  params?: BadgenParams
+}
+
+export default function (req, res, options: ServeBadgeOptions) {
   const { code = 200, sMaxAge = '604800', query = {}, params } = options
 
   const hostStyle = req.headers.host === 'flat.badgen.net' ? 'flat' : undefined
@@ -24,7 +30,9 @@ module.exports = (req, res, options = {}) => {
     iconWidth: _icon.width
   })
 
+  const staleControl = `stale-while-revalidate=604800, stale-if-error=604800`
+  res.setHeader('Cache-Control', `public, max-age=10, s-maxage=${sMaxAge}, ${staleControl}`)
   res.setHeader('Content-Type', 'image/svg+xml;charset=utf-8')
-  res.setHeader('Cache-Control', `${CACHE_CONTROL}, s-maxage=${sMaxAge}`)
-  send(res, code, badge)
+  res.statusCode = code
+  res.end(badge)
 }
diff --git a/libs/types.ts b/libs/types.ts
new file mode 100644
index 0000000..825a20a
--- /dev/null
+++ b/libs/types.ts
@@ -0,0 +1,5 @@
+export type BadgenParams = {
+  subject: string
+  status: string
+  color: string
+}