refactor(ext/fetch): align error messages (#25374)

Aligns the error messages in the ext/fetch folder to be in-line with the
Deno style guide.

https://github.com/denoland/deno/issues/25269

1 files changed, 4 insertions, 2 deletions

diff --git a/ext/fetch/21_formdata.js b/ext/fetch/21_formdata.js
index bb33ea2d4..7d466b8e2 100644
--- a/ext/fetch/21_formdata.js
+++ b/ext/fetch/21_formdata.js
@@ -396,7 +396,9 @@ class MultipartParser {
    */
   constructor(body, boundary) {
     if (!boundary) {
-      throw new TypeError("multipart/form-data must provide a boundary");
+      throw new TypeError(
+        "Cannot construct MultipartParser: multipart/form-data must provide a boundary",
+      );
     }
 
     this.boundary = `--${boundary}`;
@@ -445,7 +447,7 @@ class MultipartParser {
       ) {
         return new FormData();
       }
-      throw new TypeError("Unable to parse body as form data.");
+      throw new TypeError("Unable to parse body as form data");
     }
 
     const formData = new FormData();