fix: windows use whichSync doesn't find .cmd executables in the PATH

[kingsword09]

No description provided.

[dsherret]

Thanks! Would you be able to add a test in mod.test.ts to ensure this doesn't regress in the future?

[kingsword09]

Thanks! Would you be able to add a test in mod.test.ts to ensure this doesn't regress in the future?

When I use Deno.Command to execute the npx command on the windows platform, I use which to obtain the execution environment. It is possible to use the asynchronous method of which, but it does not work when using whichSync. Then I found that it is caused by the reason for judging the sequence, that is, in which Different from whichSync judges the location, whichSync will find npx and judge isFile to return instead of fetching npx.CMD.

[dsherret]

Ok, would you be able to add tests for this? I can do it sometime otherwise.