Merge pull request #5710 from Ivan-Feofanov/main

Add streaming response

Author: fvictorio

.changeset/warm-beans-tie.md

@@ -0,0 +1,5 @@
+---
+"hardhat": patch
+---
+
+Hardhat node can now handle large response objects by streaming them.

packages/hardhat-core/package.json

@@ -128,6 +128,7 @@
     "glob": "7.2.0",
     "immutable": "^4.0.0-rc.12",
     "io-ts": "1.10.4",
+    "json-stream-stringify": "^3.1.4",
     "keccak": "^3.0.2",
     "lodash": "^4.17.11",
     "mnemonist": "^0.38.0",

packages/hardhat-core/src/internal/hardhat-network/jsonrpc/handler.ts

@@ -1,6 +1,7 @@
 import { IncomingMessage, ServerResponse } from "http";
 import getRawBody from "raw-body";
 import WebSocket from "ws";
+import { JsonStreamStringify } from "json-stream-stringify";
 
 import { EIP1193Provider } from "../../../types";
 import {
@@ -135,7 +136,7 @@ export class JsonRpcHandler {
   ) {
     res.statusCode = 200;
     res.setHeader("Content-Type", "application/json");
-    res.end(JSON.stringify(rpcResp));
+    new JsonStreamStringify(rpcResp).pipe(res);
   }
 
   private async _handleSingleRequest(