[bedrock-agent-runtime] Incompatibility with React Native Expo projects

[jacksonalvarez12]

Checkboxes for prior research

• I've gone through Developer Guide and API reference
• I've checked AWS Forums and StackOverflow.
• I've searched for previous similar issues and didn't find any solution.

Describe the bug

This happens in a freshly created expo project. Installing the @aws-sdk/client-bedrock-agent-runtime npm package and then creating a client anywhere in the render tree causes the expo build to crash during bundling.

The resulting error is this:

Android Bundling failed 1377ms node_modules\expo-router\entry.js (1283 modules)
 ERROR  node_modules\@aws-sdk\client-bedrock-agent-runtime\dist-cjs\index.js: C:\[REDACTED]\test-app\node_modules\@aws-sdk\client-bedrock-agent-runtime\dist-cjs\index.js: Static class blocks are not enabled. Please add `@babel/plugin-transform-class-static-block` to your configuration.
  455 |
  456 | // src/BedrockAgentRuntimeClient.ts
> 457 | var BedrockAgentRuntimeClient = class extends import_smithy_client.Client {
      |                                 ^
  458 |   static {
  459 |     __name(this, "BedrockAgentRuntimeClient");
  460 |   }

Weirdly I can't find anything to do with @babel/plugin-transform-class-static-block online other than it being a run of the mill babel package. Either way, this prevents react native expo projects from using the sdk.

Additionally, I checked back as far as 3.787.0 and this still occurred

Regression Issue

• Select this option if this issue appears to be a regression.

SDK version number

@aws-sdk/client-bedrock-agent-runtime@3.823.0

Which JavaScript Runtime is this issue in?

React Native

Details of the browser/Node.js/ReactNative version

Expo sdk version 53.0.9 - a completely fresh build

Reproduction Steps

Create a new expo app using
npx create-expo-app@latest test-app

cd test-app

npm run android
(This will be a completely functioning template app)

npm install @aws-sdk/client-bedrock-agent-runtime

npm run android
(This will also work)

Now add these lines anywhere in the render tree, I did it in the top most _layout.tsx file

const client = new BedrockAgentRuntimeClient({});
  console.log(`client is defined: ${!!client}`);

npm run android
(This will now fail and show the error I provided above)

Observed Behavior

A build error occurs during android bundling

Android Bundling failed 1377ms node_modules\expo-router\entry.js (1283 modules)
 ERROR  node_modules\@aws-sdk\client-bedrock-agent-runtime\dist-cjs\index.js: C:\[REDACTED]\test-app\node_modules\@aws-sdk\client-bedrock-agent-runtime\dist-cjs\index.js: Static class blocks are not enabled. Please add `@babel/plugin-transform-class-static-block` to your configuration.
  455 |
  456 | // src/BedrockAgentRuntimeClient.ts
> 457 | var BedrockAgentRuntimeClient = class extends import_smithy_client.Client {
      |                                 ^
  458 |   static {
  459 |     __name(this, "BedrockAgentRuntimeClient");
  460 |   }

Expected Behavior

The bundling should succeed, and then show an error at runtime because the client's configuration is empty

Possible Solution

No response

Additional Information/Context

I also tested expo sdk versions 52 and 51, both had the same result

[aBurmeseDev]

Hi @jacksonalvarez12 - appreciate you checking in.

We've seen similar reports and the culprit for this error isn't SDK client but rather the dependency itself. To resolve this, add @babel/plugin-transform-class-static-block in your babel.config.js. Refer to #6933 (comment).

Hope that helps!

[jacksonalvarez12]

Yep, that was it.

For future users of expo and aws

npm install @babel/plugin-transform-class-static-block

Add "@babel/plugin-transform-class-static-block" to plugins in babel.config.js (I had to create my file. Below is the entire thing)
{ "plugins": ["@babel/plugin-transform-class-static-block"] }

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