errors: change ERR_HTTP2_HEADER_SINGLE_VALUE to TypeError

changes the base instance for ERR_HTTP2_HEADER_SINGLE_VALUE
from Error to TypeError as a more accurate representation
of the error. Additionally corrects the grammar of the error
message.

PR-URL: #19805
Reviewed-By: Ruben Bridgewater <ruben@bridgewater.de>
Reviewed-By: Colin Ihrig <cjihrig@gmail.com>
Reviewed-By: James M Snell <jasnell@gmail.com>
Reviewed-By: Matteo Collina <matteo.collina@gmail.com>

Author: davidmarkclements

lib/internal/errors.js

@@ -718,9 +718,8 @@ E('ERR_HTTP2_HEADERS_AFTER_RESPOND',
   'Cannot specify additional headers after response initiated', Error);
 E('ERR_HTTP2_HEADERS_SENT', 'Response has already been initiated.', Error);
 
-// This should probably be a `TypeError`.
 E('ERR_HTTP2_HEADER_SINGLE_VALUE',
-  'Header field "%s" must have only a single value', Error);
+  'Header field "%s" must only have a single value', TypeError);
 E('ERR_HTTP2_INFO_STATUS_NOT_ALLOWED',
   'Informational status codes cannot be used', RangeError);
 

test/parallel/test-http2-multi-content-length.js

@@ -31,8 +31,8 @@ server.listen(0, common.mustCall(() => {
       });
     }, {
       code: 'ERR_HTTP2_HEADER_SINGLE_VALUE',
-      type: Error,
-      message: 'Header field "content-length" must have only a single value'
+      type: TypeError,
+      message: 'Header field "content-length" must only have a single value'
     }
   );
 

test/parallel/test-http2-single-headers.js

@@ -31,17 +31,17 @@ server.listen(0, common.mustCall(() => {
       () => client.request({ [i]: 'abc', [i.toUpperCase()]: 'xyz' }),
       {
         code: 'ERR_HTTP2_HEADER_SINGLE_VALUE',
-        type: Error,
-        message: `Header field "${i}" must have only a single value`
+        type: TypeError,
+        message: `Header field "${i}" must only have a single value`
       }
     );
 
     common.expectsError(
       () => client.request({ [i]: ['abc', 'xyz'] }),
       {
         code: 'ERR_HTTP2_HEADER_SINGLE_VALUE',
-        type: Error,
-        message: `Header field "${i}" must have only a single value`
+        type: TypeError,
+        message: `Header field "${i}" must only have a single value`
       }
     );
   });

test/parallel/test-http2-util-headers-list.js

@@ -177,8 +177,8 @@ const {
 
   common.expectsError({
     code: 'ERR_HTTP2_HEADER_SINGLE_VALUE',
-    type: Error,
-    message: 'Header field ":status" must have only a single value'
+    type: TypeError,
+    message: 'Header field ":status" must only have a single value'
   })(mapToHeaders(headers));
 }
 
@@ -223,7 +223,7 @@ const {
   HTTP2_HEADER_USER_AGENT,
   HTTP2_HEADER_X_CONTENT_TYPE_OPTIONS
 ].forEach((name) => {
-  const msg = `Header field "${name}" must have only a single value`;
+  const msg = `Header field "${name}" must only have a single value`;
   common.expectsError({
     code: 'ERR_HTTP2_HEADER_SINGLE_VALUE',
     message: msg