chore: add `copyright_checker` tool and add the missing copyright (#17285)

1 files changed, 2 insertions, 0 deletions

diff --git a/cli/js.rs b/cli/js.rs
index 4bf3da627..06a6a5fd9 100644
--- a/cli/js.rs
+++ b/cli/js.rs
@@ -1,3 +1,5 @@
+// Copyright 2018-2023 the Deno authors. All rights reserved. MIT license.
+
 use deno_core::Snapshot;
 use log::debug;
 use once_cell::sync::Lazy;