feat(cli): add warning for incorrectly ordered flags (#16734)

This code checks if permission flags are incorrectly defined after the
module name (e.g. `deno run mod.ts --allow-read` instead of the correct
`deno run --allow-read mod.ts`). If so, a simple warning is displayed.

1 files changed, 11 insertions, 0 deletions

diff --git a/cli/main.rs b/cli/main.rs
index b91540c37..f18c3c976 100644
--- a/cli/main.rs
+++ b/cli/main.rs
@@ -686,6 +686,17 @@ async fn run_command(
     return run_from_stdin(flags).await;
   }
 
+  if !flags.has_permission() && flags.has_permission_in_argv() {
+    log::warn!(
+      "{}",
+      crate::colors::yellow(
+        r#"Permission flags have likely been incorrectly set after the script argument.
+To grant permissions, set them before the script argument. For example:
+    deno run --allow-read=. main.js"#
+      )
+    );
+  }
+
   if flags.watch.is_some() {
     return run_with_watch(flags, run_flags.script).await;
   }