chore: add test to ensure parsing only happens once on first load (#23837)

4 files changed, 11 insertions, 0 deletions

diff --git a/cli/cache/parsed_source.rs b/cli/cache/parsed_source.rs
index 94accb616..688f2b9fb 100644
--- a/cli/cache/parsed_source.rs
+++ b/cli/cache/parsed_source.rs
@@ -77,6 +77,8 @@ impl ParsedSourceCache {
       if parsed_source.media_type() == media_type
         && parsed_source.text_info().text_str() == source.as_ref()
       {
+        // note: message used tests
+        log::debug!("Removed parsed source: {}", specifier);
         return Ok(parsed_source);
       }
     }
diff --git a/tests/specs/run/no_reparse_first_load/__test__.jsonc b/tests/specs/run/no_reparse_first_load/__test__.jsonc
new file mode 100644
index 000000000..cd6e60e72
--- /dev/null
+++ b/tests/specs/run/no_reparse_first_load/__test__.jsonc
@@ -0,0 +1,6 @@
+// ensures we don't reparse a source file when transpiling
+// because it should have already been parsed by module analysis
+{
+  "args": "run --log-level=debug main.ts",
+  "output": "main.out"
+}
diff --git a/tests/specs/run/no_reparse_first_load/main.out b/tests/specs/run/no_reparse_first_load/main.out
new file mode 100644
index 000000000..08af76600
--- /dev/null
+++ b/tests/specs/run/no_reparse_first_load/main.out
@@ -0,0 +1,2 @@
+[WILDCARD]Removed parsed source: file:///[WILDLINE]/main.ts
+[WILDCARD]
diff --git a/tests/specs/run/no_reparse_first_load/main.ts b/tests/specs/run/no_reparse_first_load/main.ts
new file mode 100644
index 000000000..bf6b81796
--- /dev/null
+++ b/tests/specs/run/no_reparse_first_load/main.ts
@@ -0,0 +1 @@
+console.log("Hello");