child_process: better spawn error message

Throw ERR_INVALID_ARG_VALUE when filename passed to spawn is empty.

Fixes: #19235

PR-URL: #19305
Reviewed-By: Anna Henningsen <[email protected]>
Reviewed-By: Colin Ihrig <[email protected]>
Reviewed-By: Luigi Pinca <[email protected]>

Author: bzoz

lib/child_process.js

@@ -386,9 +386,12 @@ function _convertCustomFds(options) {
 }
 
 function normalizeSpawnArguments(file, args, options) {
-  if (typeof file !== 'string' || file.length === 0)
+  if (typeof file !== 'string')
     throw new ERR_INVALID_ARG_TYPE('file', 'string', file);
 
+  if (file.length === 0)
+    throw new ERR_INVALID_ARG_VALUE('file', file, 'cannot be empty');
+
   if (Array.isArray(args)) {
     args = args.slice(0);
   } else if (args !== undefined &&

test/parallel/test-child-process-spawn-typeerror.js

@@ -30,10 +30,10 @@ const invalidcmd = 'hopefully_you_dont_have_this_on_your_machine';
 const empty = fixtures.path('empty.js');
 
 const invalidArgValueError =
-  common.expectsError({ code: 'ERR_INVALID_ARG_VALUE', type: TypeError }, 13);
+  common.expectsError({ code: 'ERR_INVALID_ARG_VALUE', type: TypeError }, 14);
 
 const invalidArgTypeError =
-  common.expectsError({ code: 'ERR_INVALID_ARG_TYPE', type: TypeError }, 11);
+  common.expectsError({ code: 'ERR_INVALID_ARG_TYPE', type: TypeError }, 10);
 
 assert.throws(function() {
   const child = spawn(invalidcmd, 'this is not an array');
@@ -53,7 +53,7 @@ assert.throws(function() {
 
 assert.throws(function() {
   spawn('');
-}, invalidArgTypeError);
+}, invalidArgValueError);
 
 assert.throws(function() {
   const file = { toString() { return null; } };