Add disclaimer in README and process warning (#679)

.changeset/two-oranges-bow.md

@@ -0,0 +1,5 @@
+---
+"aws-sdk-js-codemod": patch
+---
+
+Add disclaimer in README and process warning

README.md

@@ -13,6 +13,9 @@ You can provide names of the custom transforms instead of a local path or url:
      v2-to-v3  Converts AWS SDK for JavaScript APIs in a Javascript/TypeScript
                codebase from version 2 (v2) to version 3 (v3).
 
+Please review the code change thoroughly for required functionality before deploying it to production.
+If the transformation is not complete or is incorrect, please report the issue on GitHub.
+
 ## Prerequisites
 
 To use aws-sdk-js-codemod, please install [Node.js][install-nodejs].

src/cli.ts

@@ -40,6 +40,17 @@ if (args[2] === "--help" || args[2] === "-h") {
   process.stdout.write(getHelpParagraph(transforms));
 }
 
+const disclaimerLines = [
+  `╔════════════════════════════════════════════════════════╗`,
+  `║ Please review the code change thoroughly for required  ║`,
+  `║ functionality before deploying it to production.       ║`,
+  `║                                                        ║`,
+  `║ If the transformation is not complete or is incorrect, ║`,
+  `║ please report the issue on GitHub.                     ║`,
+  `╚════════════════════════════════════════════════════════╝`,
+  ``,
+];
+
 const parser = getJsCodeshiftParser();
 
 let options, positionalArguments;
@@ -61,6 +72,10 @@ try {
 
 const { transform } = options;
 if (transforms.map(({ name }) => name).includes(transform)) {
+  const supressDisclaimer = process.env.AWS_SDK_JS_CODEMOD_SUPRESS_WARNING;
+  if (!supressDisclaimer || !supressDisclaimer === "1") {
+    console.warn(disclaimerLines.map((line) => `\n${line}`).join(""));
+  }
   options.transform = getUpdatedTransformFile(transform);
 }