fix: revert removal of EthSubscription type

Author: schaable

v-next/hardhat/src/internal/builtin-plugins/network-manager/edr/edr-provider.ts

@@ -3,6 +3,7 @@ import type { LoggerConfig } from "./types/logger.js";
 import type { TracingConfig } from "./types/node-types.js";
 import type { EdrNetworkConfig } from "../../../../types/config.js";
 import type {
+  EthSubscription,
   JsonRpcResponse,
   RequestArguments,
   SuccessfulJsonRpcResponse,
@@ -332,13 +333,14 @@ export class EdrProvider extends BaseProvider {
   }
 
   #emitEip1193SubscriptionEvent(subscription: string, result: unknown) {
-    this.emit("message", {
+    const message: EthSubscription = {
       type: "eth_subscription",
       data: {
         subscription,
         result,
       },
-    });
+    };
+    this.emit("message", message);
   }
 }
 

v-next/hardhat/src/types/providers.ts

@@ -88,6 +88,17 @@ export interface EthereumProvider extends EIP1193Provider {
   ): void;
 }
 
+/**
+ * A message emitted by the provider as a result of an eth_subscription.
+ */
+export interface EthSubscription {
+  readonly type: "eth_subscription";
+  readonly data: {
+    readonly subscription: string;
+    readonly result: unknown;
+  };
+}
+
 /**
  * A JSON-RPC 2.0 request object.
  *