3 files changed, 34 insertions, 0 deletions
diff --git a/cli/tests/compiler_api_test.ts b/cli/tests/compiler_api_test.ts
index 04a4675b8..c6e7de651 100644
--- a/cli/tests/compiler_api_test.ts
+++ b/cli/tests/compiler_api_test.ts
@@ -338,3 +338,22 @@ Deno.test({
     assert(files["deno:///bundle.js"].endsWith("})();\n"));
   },
 });
+
+Deno.test({
+  name: `Deno.emit() - throws descriptive error when unable to load import map`,
+  async fn() {
+    await assertThrowsAsync(
+      async () => {
+        await Deno.emit("/a.ts", {
+          bundle: "classic",
+          sources: {
+            "/a.ts": `console.log("hello");`,
+          },
+          importMapPath: "file:///import_map_does_not_exist.json",
+        });
+      },
+      Error,
+      "Unable to load 'file:///import_map_does_not_exist.json' import map",
+    );
+  },
+});
diff --git a/cli/tests/error_import_map_unable_to_load.out b/cli/tests/error_import_map_unable_to_load.out
new file mode 100644
index 000000000..50760e438
--- /dev/null
+++ b/cli/tests/error_import_map_unable_to_load.out
@@ -0,0 +1,4 @@
+error: Unable to load '[WILDCARD]' import map
+
+Caused by:
+    [WILDCARD]
+\ No newline at end of file
diff --git a/cli/tests/integration_tests.rs b/cli/tests/integration_tests.rs
index 5cbe00302..f2d1c1770 100644
--- a/cli/tests/integration_tests.rs
+++ b/cli/tests/integration_tests.rs
@@ -3841,6 +3841,17 @@ console.log("finish");
     http_server: true,
   });
 
+  // This test ensures that a descriptive error is shown when we're unable to load
+  // the import map. Even though this tests only the `run` subcommand, we can be sure
+  // that the error message is similar for other subcommands as they all use
+  // `program_state.maybe_import_map` to access the import map underneath.
+  itest!(error_import_map_unable_to_load {
+    args:
+      "run --import-map=import_maps/does_not_exist.json import_maps/test.ts",
+    output: "error_import_map_unable_to_load.out",
+    exit_code: 1,
+  });
+
   #[test]
   fn no_validate_asm() {
     let output = util::deno_cmd()