fix(add): Handle packages without root exports (#25102)

Fixes #24607.

This PR makes the logic that caches top level dependencies (things
present in import map) smarter, so we handle JSR dependencies without
root exports.

4 files changed, 17 insertions, 0 deletions

diff --git a/tests/specs/add/no_root_export/__test__.jsonc b/tests/specs/add/no_root_export/__test__.jsonc
new file mode 100644
index 000000000..2adfbd8de
--- /dev/null
+++ b/tests/specs/add/no_root_export/__test__.jsonc
@@ -0,0 +1,9 @@
+{
+  "tempDir": true,
+  "steps": [
+    {
+      "args": "add @std/testing",
+      "output": "add.out"
+    }
+  ]
+}
diff --git a/tests/specs/add/no_root_export/add.out b/tests/specs/add/no_root_export/add.out
new file mode 100644
index 000000000..4bd9da7be
--- /dev/null
+++ b/tests/specs/add/no_root_export/add.out
@@ -0,0 +1,5 @@
+Add jsr:@std/testing@1.0.0
+[UNORDERED_START]
+Download http://127.0.0.1:4250/@std/testing/1.0.0/bdd.ts
+Download http://127.0.0.1:4250/@std/testing/1.0.0/types.ts
+[UNORDERED_END]
diff --git a/tests/specs/add/no_root_export/deno.json b/tests/specs/add/no_root_export/deno.json
new file mode 100644
index 000000000..e69de29bb
--- /dev/null
+++ b/tests/specs/add/no_root_export/deno.json
diff --git a/tests/specs/add/no_root_export/main.ts b/tests/specs/add/no_root_export/main.ts
new file mode 100644
index 000000000..0c0d4107f
--- /dev/null
+++ b/tests/specs/add/no_root_export/main.ts
@@ -0,0 +1,3 @@
+import { it } from "@std/testing/bdd";
+
+const _it = it;