make isContentType textual private

packages/kit/package.json

@@ -74,9 +74,6 @@
 		"./install-fetch": {
 			"import": "./dist/install-fetch.js"
 		},
-		"./adapter-utils": {
-			"import": "./dist/adapter-utils.js"
-		},
 		"./types": "./types/index.d.ts"
 	},
 	"types": "types/index.d.ts",

packages/kit/rollup.config.js

@@ -48,8 +48,7 @@ export default [
 			cli: 'src/cli.js',
 			ssr: 'src/runtime/server/index.js',
 			node: 'src/core/node/index.js',
-			'install-fetch': 'src/install-fetch.js',
-			'adapter-utils': 'src/core/adapter-utils.js'
+			'install-fetch': 'src/install-fetch.js'
 		},
 		output: {
 			dir: 'dist',

packages/kit/src/runtime/server/endpoint.js

@@ -1,4 +1,3 @@
-import { isContentTypeTextual } from '../../core/adapter-utils.js';
 import { lowercase_keys } from './utils.js';
 
 /** @param {string} body */
@@ -15,6 +14,23 @@ function is_string(s) {
 	return typeof s === 'string' || s instanceof String;
 }
 
+/**
+ * Decides how the body should be parsed based on its mime type. Should match what's in parse_body
+ *
+ * @param {string | undefined | null} content_type The `content-type` header of a request/response.
+ * @returns {boolean}
+ */
+function is_content_type_textual(content_type) {
+	if (!content_type) return true; // defaults to json
+	const [type] = content_type.split(';'); // get the mime type
+	return (
+		type === 'text/plain' ||
+		type === 'application/json' ||
+		type === 'application/x-www-form-urlencoded' ||
+		type === 'multipart/form-data'
+	);
+}
+
 /**
  * @param {import('types/hooks').ServerRequest} request
  * @param {import('types/internal').SSREndpoint} route
@@ -48,7 +64,7 @@ export async function render_endpoint(request, route, match) {
 	headers = lowercase_keys(headers);
 	const type = headers['content-type'];
 
-	const is_type_textual = isContentTypeTextual(type);
+	const is_type_textual = is_content_type_textual(type);
 
 	if (!is_type_textual && !(body instanceof Uint8Array || is_string(body))) {
 		return error(