Add test waiters/callback-arrow-fn (#437)

Author: trivikr

src/transforms/v2-to-v3/__fixtures__/waiters/callback-arrow-fn.input.js

@@ -0,0 +1,9 @@
+import AWS from "aws-sdk";
+
+const Bucket = "BUCKET_NAME";
+const client = new AWS.S3({ region: "REGION" });
+
+client.waitFor("bucketExists", { Bucket }, (err, data) => {
+  if (err) console.log(err, err.stack); // an error occurred
+  else console.log(data); // successful response
+});

src/transforms/v2-to-v3/__fixtures__/waiters/callback-arrow-fn.output.js

@@ -0,0 +1,11 @@
+import AWS from "aws-sdk";
+
+const Bucket = "BUCKET_NAME";
+const client = new AWS.S3({ region: "REGION" });
+
+// Waiters with callbacks are not supported in AWS SDK for JavaScript (v3).
+// Please convert to `await client.waitFor(state, params).promise()`, and re-run aws-sdk-js-codemod.
+client.waitFor("bucketExists", { Bucket }, (err, data) => {
+  if (err) console.log(err, err.stack); // an error occurred
+  else console.log(data); // successful response
+});