fix: warn about import assertions when using typescript (#25135)

1. On emit, checks for the prescence of import assertions.
1. Warns and doesn't store the parsed source in the emit cache in this
case.

1 files changed, 3 insertions, 0 deletions

diff --git a/tests/specs/run/ts_import_assertions/data.json b/tests/specs/run/ts_import_assertions/data.json
new file mode 100644
index 000000000..e5b07266c
--- /dev/null
+++ b/tests/specs/run/ts_import_assertions/data.json
@@ -0,0 +1,3 @@
+{
+  "prop": "data"
+}