Description

Flushes the memorized request ids in the duplicate request middleware every 3 minutes, and makes the middleware ignore JSON-RPC notifications. Also converts the middleware to TypeScript.

The duplicate request middleware used to dedupe JSON-RPC requests with the same id under MV3 used an internal array that would grow boundlessly until the background restarted. In addition, this middleware assumed that it would never see any JSON-RPC notifications (or it would always reject the n + 1:th notifications, since their ids are always undefined). Although we in practice always add ids to JSON-RPC requests, it seems ill-advised for this middleware to make that assumption.

Related issues

N/A

Manual testing steps

1. Build the extension under MV3
2. Ensure that RPC requests are working correctly

Pre-merge author checklist

• I’ve followed MetaMask Coding Standards.
• I've completed the PR template to the best of my ability
• I’ve included tests if applicable
• I’ve documented my code using JSDoc format if applicable
• I’ve applied the right labels on the PR (see labeling guidelines). Not required for external contributors.

Pre-merge reviewer checklist

• I've manually tested the PR (e.g. pull and build branch, run the app, test code being changed).
• I confirm that this PR addresses all acceptance criteria described in the ticket it closes and includes the necessary testing evidence such as recordings and or screenshots.