1 files changed, 17 insertions, 0 deletions
diff --git a/js/url_search_params.ts b/js/url_search_params.ts
index 13b272476..1d9aa43b3 100644
--- a/js/url_search_params.ts
+++ b/js/url_search_params.ts
@@ -1,8 +1,10 @@
 // Copyright 2018-2019 the Deno authors. All rights reserved. MIT license.
+import { URL } from "./url";
 import { requiredArguments } from "./util";
 
 export class URLSearchParams {
   private params: Array<[string, string]> = [];
+  private url: URL | null = null;
 
   constructor(init: string | string[][] | Record<string, string> = "") {
     if (typeof init === "string") {
@@ -30,6 +32,20 @@ export class URLSearchParams {
     }
   }
 
+  private updateSteps(): void {
+    if (this.url === null) {
+      return;
+    }
+
+    let query: string | null = this.toString();
+    if (query === "") {
+      query = null;
+    }
+
+    // eslint-disable-next-line @typescript-eslint/no-explicit-any
+    (this.url as any)._parts.query = query;
+  }
+
   /** Appends a specified key/value pair as a new search parameter.
    *
    *       searchParams.append('name', 'first');
@@ -56,6 +72,7 @@ export class URLSearchParams {
         i++;
       }
     }
+    this.updateSteps();
   }
 
   /** Returns all the values associated with a given search parameter