feat(api): typescript

api/services/existence.ts

@@ -0,0 +1,25 @@
+import { send, sendError, fetch, NowRequest, NowResponse } from '../util/http'
+
+export default async function handler(req: NowRequest, res: NowResponse) {
+  const { query } = req.query
+
+  if (!query) {
+    return sendError(res, new Error('no query given'))
+  }
+
+  if (
+    !/^[(http(s)?):\/\/(www\.)?a-zA-Z0-9@:%._\+~#=]{2,256}\.[a-z]{2,6}\b([-a-zA-Z0-9@:%_\+.~#?&//=]*)$/.test(
+      query
+    )
+  ) {
+    return sendError(res, new Error('invalid characters'))
+  }
+
+  try {
+    const response = await fetch(`https://${query}`)
+    const availability = response.status === 404
+    send(res, { availability })
+  } catch (err) {
+    sendError(res, err)
+  }
+}