Add comment about credentials transformation

src/transforms/v2-to-v3/__fixtures__/credentials/chainable.input.js

@@ -0,0 +1,6 @@
+import AWS from "aws-sdk";
+
+new AWS.ChainableTemporaryCredentials({
+  params: { RoleArn: "RoleA" },
+  masterCredentials: existingCredentials,
+});

src/transforms/v2-to-v3/__fixtures__/credentials/chainable.output.js

@@ -0,0 +1,9 @@
+import { fromTemporaryCredentials } from "@aws-sdk/credential-providers";
+
+// JS SDK v3 switched to credential providers to functions instead of objects.
+// This is the closest approximation from codemod of what your application needs.
+// Reference: https://www.npmjs.com/package/@aws-sdk/credential-providers
+fromTemporaryCredentials({
+  params: { RoleArn: "RoleA" },
+  masterCredentials: existingCredentials,
+});

src/transforms/v2-to-v3/__fixtures__/credentials/ec2-metadata.input.js

@@ -1,3 +1,3 @@
 import AWS from "aws-sdk";
 
-const credentials = new AWS.EC2MetadataCredentials();
+new AWS.EC2MetadataCredentials();

src/transforms/v2-to-v3/__fixtures__/credentials/ec2-metadata.output.js

@@ -1,3 +1,6 @@
 import { fromInstanceMetadata } from "@aws-sdk/credential-providers";
 
-const credentials = fromInstanceMetadata();
+// JS SDK v3 switched to credential providers to functions instead of objects.
+// This is the closest approximation from codemod of what your application needs.
+// Reference: https://www.npmjs.com/package/@aws-sdk/credential-providers
+fromInstanceMetadata();

src/transforms/v2-to-v3/__fixtures__/credentials/ecs.input.js

@@ -1,3 +1,3 @@
 import AWS from "aws-sdk";
 
-const credentials = new AWS.ECSCredentials();
+new AWS.ECSCredentials();

src/transforms/v2-to-v3/__fixtures__/credentials/ecs.output.js

@@ -1,3 +1,6 @@
 import { fromContainerMetadata } from "@aws-sdk/credential-providers";
 
-const credentials = fromContainerMetadata();
+// JS SDK v3 switched to credential providers to functions instead of objects.
+// This is the closest approximation from codemod of what your application needs.
+// Reference: https://www.npmjs.com/package/@aws-sdk/credential-providers
+fromContainerMetadata();

src/transforms/v2-to-v3/__fixtures__/credentials/env.input.js

@@ -1,3 +1,3 @@
 import AWS from "aws-sdk";
 
-const credentials = new AWS.EnvironmentCredentials("AWS");
+new AWS.EnvironmentCredentials("AWS");

src/transforms/v2-to-v3/__fixtures__/credentials/env.output.js

@@ -1,3 +1,6 @@
 import { fromEnv } from "@aws-sdk/credential-providers";
 
-const credentials = fromEnv("AWS");
+// JS SDK v3 switched to credential providers to functions instead of objects.
+// This is the closest approximation from codemod of what your application needs.
+// Reference: https://www.npmjs.com/package/@aws-sdk/credential-providers
+fromEnv("AWS");

src/transforms/v2-to-v3/apis/replaceAwsCredentials.ts

@@ -29,7 +29,21 @@ export const replaceAwsCredentials = (
         packageName: "@aws-sdk/credential-providers",
       });
       credsNewExpressions.replaceWith(({ node }) =>
-        j.callExpression(j.identifier(v3ProviderName), node.arguments)
+        j.callExpression.from({
+          callee: j.identifier(v3ProviderName),
+          comments: [
+            j.commentLine(
+              " JS SDK v3 switched to credential providers to functions instead of objects."
+            ),
+            j.commentLine(
+              " This is the closest approximation from codemod of what your application needs."
+            ),
+            j.commentLine(
+              " Reference: https://www.npmjs.com/package/@aws-sdk/credential-providers"
+            ),
+          ],
+          arguments: node.arguments,
+        })
       );
     }
   }