Fix/salesforce textdecoderstream

[brianbaldock]

This pull request improves compatibility of the Copilot streaming client with Salesforce Lightning environments (Locker/LWS), and updates project dependencies. The main change is to ensure the app gracefully falls back to REST polling when the required streaming API (TextDecoderStream) is unavailable, preventing runtime errors in restricted environments.

Compatibility improvements for Salesforce Lightning (Locker/LWS):

• Added a runtime check for TextDecoderStream before enabling the streaming Direct Line client, logging a debug message and falling back to REST polling if unavailable. (lightningCopilotAuth.js)
• Updated the postActivity method to only use the streaming client when TextDecoderStream is present, ensuring robust handling in environments where this API is missing. (lightningCopilotAuth.js)

Dependency updates:

• Added @salesforce/cli as a project dependency in package.json to support Salesforce CLI operations.

[Copilot]

Pull request overview

This pull request enhances compatibility with Salesforce Lightning restricted environments (Locker/LWS) by adding runtime checks for the TextDecoderStream API, which may not be available in these environments. The changes ensure that the streaming DirectLine client gracefully falls back to REST polling when the required API is unavailable, preventing runtime errors.

Changes:

• Added runtime checks for TextDecoderStream availability in both connection validation and message posting methods
• Ensured consistent fallback behavior to REST polling when streaming is unavailable
• Added @salesforce/cli as a project dependency
• Removed commented lines from .gitignore

Reviewed changes

Copilot reviewed 2 out of 4 changed files in this pull request and generated 1 comment.

File	Description
lightningCopilotAuth.js	Added TextDecoderStream availability checks in tryAdoptStreamingConnection and postActivity methods to gracefully fallback to REST polling in restricted Salesforce environments
package.json	Added @salesforce/cli as a dependency (may be unnecessary)
.gitignore	Removed commented-out lines for optional adaptive card vendor files

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[Copilot]

The addition of @salesforce/cli as a production dependency appears unnecessary for this project. After reviewing the build scripts and codebase, this package is not imported or referenced anywhere in the code. The Salesforce CLI is typically a development or deployment tool that should be installed globally or used as a devDependency if needed for CI/CD scripts. Adding it as a production dependency significantly increases the bundle size (it's a large package with many transitive dependencies) without providing any runtime value to the LWC component. Consider removing this dependency or moving it to devDependencies if it's needed for development/deployment scripts.