feat: JsonRpcEngineV2

eslint-warning-thresholds.json

@@ -191,12 +191,6 @@
   "packages/gas-fee-controller/src/determineGasFeeCalculations.ts": {
     "jsdoc/tag-lines": 4
   },
-  "packages/json-rpc-engine/src/JsonRpcEngine.test.ts": {
-    "jest/no-conditional-in-test": 2
-  },
-  "packages/json-rpc-engine/src/JsonRpcEngine.ts": {
-    "@typescript-eslint/prefer-promise-reject-errors": 2
-  },
   "packages/json-rpc-middleware-stream/src/index.test.ts": {
     "@typescript-eslint/prefer-promise-reject-errors": 3,
     "no-empty-function": 1

packages/json-rpc-engine/CHANGELOG.md

@@ -7,10 +7,21 @@ and this project adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0
 
 ## [Unreleased]
 
+### Added
+
+- `JsonRpcEngineV2` ([#6176](https://github.com/MetaMask/core/pull/6176))
+  - This is a complete rewrite of `JsonRpcEngine`, intended to replace the original implementation.
+    See the readme for details.
+
 ### Changed
 
 - Bump `@metamask/utils` from `^11.2.0` to `^11.4.2` ([#6054](https://github.com/MetaMask/core/pull/6054))
 
+### Deprecated
+
+- `JsonRpcEngine` and related types ([#6176](https://github.com/MetaMask/core/pull/6176))
+  - To be replaced by `JsonRpcEngineV2`.
+
 ## [10.0.3]
 
 ### Changed