Revert "migration (#295)" (#301)

This reverts commit 2ee397fa4b.

scripts/confirm.js

@@ -1,22 +0,0 @@
-const readline = require('readline');
-
-module.exports.confirm = (query) => {
-  const rl = readline.createInterface({
-    input: process.stdin,
-    output: process.stdout,
-    terminal: false,
-  });
-
-  return new Promise((resolve) =>
-    rl.question(query, (ans) => {
-      if (ans !== 'yes') {
-        rl.close();
-        console.log('Exiting');
-        process.exit(1);
-      } else {
-        rl.close();
-        resolve(ans);
-      }
-    })
-  );
-};