Fix query params splitting (#1467)

.changeset/cool-hounds-divide.md

@@ -0,0 +1,5 @@
+---
+'@sveltejs/adapter-netlify': patch
+---
+
+Prevent adapter from splitting query params if they contain commas

.changeset/little-shirts-happen.md

@@ -0,0 +1,5 @@
+---
+'@sveltejs/adapter-begin': patch
+---
+
+Prevent adapter from splitting query params if they contain commas

packages/adapter-begin/src/index.js

@@ -4,15 +4,9 @@ import url from 'url';
 import app from '@architect/shared/app.js'; // eslint-disable-line import/no-unresolved
 
 async function handler(event) {
-	const { host, rawPath: path, httpMethod, headers, queryStringParameters, body } = event;
+	const { host, rawPath: path, httpMethod, rawQueryString, headers, body } = event;
 
-	const query = new url.URLSearchParams();
-	for (const k in queryStringParameters) {
-		const value = queryStringParameters[k];
-		value.split(', ').forEach((v) => {
-			query.append(k, v);
-		});
-	}
+	const query = new url.URLSearchParams(rawQueryString);
 
 	const rendered = await app.render({
 		host,

packages/adapter-netlify/files/entry.js

@@ -4,15 +4,9 @@ import '@sveltejs/kit/install-fetch'; // eslint-disable-line import/no-unresolve
 import { render } from '../output/server/app.js'; // eslint-disable-line import/no-unresolved
 
 export async function handler(event) {
-	const { path, httpMethod, headers, queryStringParameters, body, isBase64Encoded } = event;
+	const { path, httpMethod, headers, rawQuery, body, isBase64Encoded } = event;
 
-	const query = new URLSearchParams();
-	for (const k in queryStringParameters) {
-		const value = queryStringParameters[k];
-		value.split(', ').forEach((v) => {
-			query.append(k, v);
-		});
-	}
+	const query = new URLSearchParams(rawQuery);
 
 	const rawBody =
 		headers['content-type'] === 'application/octet-stream'