fix(ext/node): polyfill response._implicitHeader method (#18738)

1 files changed, 6 insertions, 1 deletions

diff --git a/ext/node/polyfills/http.ts b/ext/node/polyfills/http.ts
index ab5e2b438..12d71277f 100644
--- a/ext/node/polyfills/http.ts
+++ b/ext/node/polyfills/http.ts
@@ -485,7 +485,7 @@ export class ServerResponse extends NodeWritable {
     return this.#headers.has(name);
   }
 
-  writeHead(status: number, headers: Record<string, string>) {
+  writeHead(status: number, headers: Record<string, string> = {}) {
     this.statusCode = status;
     for (const k in headers) {
       if (Object.hasOwn(headers, k)) {
@@ -540,6 +540,11 @@ export class ServerResponse extends NodeWritable {
     // @ts-expect-error The signature for cb is stricter than the one implemented here
     return super.end(chunk, encoding, cb);
   }
+
+  // Undocumented API used by `npm:compression`.
+  _implicitHeader() {
+    this.writeHead(this.statusCode);
+  }
 }
 
 // TODO(@AaronO): optimize