5 files changed, 8 insertions, 15 deletions
diff --git a/cli/deno_dir.rs b/cli/deno_dir.rs
index 5b7b65f4b..c58a252cb 100644
--- a/cli/deno_dir.rs
+++ b/cli/deno_dir.rs
@@ -26,16 +26,6 @@ use std::str;
 use url;
 use url::Url;
 
-/// Gets corresponding MediaType given extension
-fn extmap(ext: &str) -> msg::MediaType {
-  match ext {
-    "ts" => msg::MediaType::TypeScript,
-    "js" => msg::MediaType::JavaScript,
-    "json" => msg::MediaType::Json,
-    _ => msg::MediaType::Unknown,
-  }
-}
-
 #[derive(Clone)]
 pub struct DenoDir {
   // Example: /Users/rld/.deno/
@@ -553,6 +543,7 @@ fn map_file_extension(path: &Path) -> msg::MediaType {
     Some(os_str) => match os_str.to_str() {
       Some("ts") => msg::MediaType::TypeScript,
       Some("js") => msg::MediaType::JavaScript,
+      Some("mjs") => msg::MediaType::JavaScript,
       Some("json") => msg::MediaType::Json,
       _ => msg::MediaType::Unknown,
     },
@@ -871,11 +862,7 @@ fn save_source_code_headers(
     let mime_type_string = mime_type.clone().unwrap();
     let resolved_mime_type =
       { map_content_type(Path::new(""), Some(mime_type_string.as_str())) };
-    let ext = p
-      .extension()
-      .map(|x| x.to_str().unwrap_or(""))
-      .unwrap_or("");
-    let ext_based_mime_type = extmap(&ext);
+    let ext_based_mime_type = map_file_extension(&p);
     // Add mime to headers only when content type is different from extension.
     if ext_based_mime_type == msg::MediaType::Unknown
       || resolved_mime_type != ext_based_mime_type
diff --git a/tests/021_mjs_modules.test b/tests/021_mjs_modules.test
new file mode 100644
index 000000000..9b60b9d97
--- /dev/null
+++ b/tests/021_mjs_modules.test
@@ -0,0 +1,2 @@
+args: --reload tests/021_mjs_modules.ts
+output: tests/021_mjs_modules.ts.out
diff --git a/tests/021_mjs_modules.ts b/tests/021_mjs_modules.ts
new file mode 100644
index 000000000..6052b9081
--- /dev/null
+++ b/tests/021_mjs_modules.ts
@@ -0,0 +1,2 @@
+import { isMod5 } from "./subdir/mod5.mjs";
+console.log(isMod5);
diff --git a/tests/021_mjs_modules.ts.out b/tests/021_mjs_modules.ts.out
new file mode 100644
index 000000000..27ba77dda
--- /dev/null
+++ b/tests/021_mjs_modules.ts.out
@@ -0,0 +1 @@
+true
diff --git a/tests/subdir/mod5.mjs b/tests/subdir/mod5.mjs
new file mode 100644
index 000000000..f21d8862b
--- /dev/null
+++ b/tests/subdir/mod5.mjs
@@ -0,0 +1 @@
+export const isMod5 = true;