Fix type issue in codesandbox-api

Author: CompuIves

packages/codesandbox-api/src/dispatcher/host.ts

@@ -1,3 +1,5 @@
+declare var process: { env: { CODESANDBOX_HOST: string | undefined } };
+
 const host = process.env.CODESANDBOX_HOST;
 
 export default host || 'https://codesandbox.io';