fix(core): panic at build time if extension code contains anything other than 7-bit ASCII (#18372)

This will improve diagnostics and catch any non-ASCII extension code
early.

This will use `debug_assert!` rather than `assert!` to avoid runtime
costs, and ensures (in debug_assert mode only) that all extension source
files are ASCII as we load them.

1 files changed, 1 insertions, 1 deletions

diff --git a/runtime/build.rs b/runtime/build.rs
index 5d0ba0cc7..df20c5427 100644
--- a/runtime/build.rs
+++ b/runtime/build.rs
@@ -34,7 +34,7 @@ mod startup_snapshot {
         file_source.specifier
       ),
     };
-    let code = file_source.code.load()?;
+    let code = file_source.load()?;
 
     if !should_transpile {
       return Ok(code);