diff --git a/graphify/extract.py b/graphify/extract.py
index bd8d541c5..1025f3e80 100644
--- a/graphify/extract.py
+++ b/graphify/extract.py
@@ -4975,6 +4975,11 @@ def _resolve_python_member_calls(
             _emit_call(caller, children[0], rc)
 
 
+# Every suffix the TS/JS extractors claim. The member-call resolver both activates on
+# and parks by this set, so a pure-ESM (`.mjs`) repo is not silently left out.
+_JS_TS_SUFFIXES = (".ts", ".tsx", ".mts", ".cts", ".js", ".jsx", ".mjs", ".cjs")
+
+
 def _resolve_typescript_member_calls(
     per_file: list[dict],
     all_nodes: list[dict],
@@ -7049,7 +7054,8 @@ register_language_resolver(
     LanguageResolver("ruby_member_calls", frozenset({".rb", ".rake"}), resolve_ruby_member_calls)
 )
 register_language_resolver(
-    LanguageResolver("typescript_member_calls", frozenset({".ts", ".tsx", ".mts", ".cts", ".js", ".jsx"}), _resolve_typescript_member_calls)
+    LanguageResolver("typescript_member_calls", frozenset(_JS_TS_SUFFIXES),
+                     _resolve_typescript_member_calls)
 )
 # C++ (#1547) and ObjC (#1556) receiver-typed member-call resolution. `.h` is in
 # both suffix sets because it routes to extract_cpp or extract_objc by content; the
diff --git a/tests/test_ts_receiver_member_calls.py b/tests/test_ts_receiver_member_calls.py
index 03771cbb8..5752156ac 100644
--- a/tests/test_ts_receiver_member_calls.py
+++ b/tests/test_ts_receiver_member_calls.py
@@ -296,3 +296,14 @@ def test_public_property_sharing_a_private_methods_node_keeps_its_edge(tmp_path)
                    "export function go(c: Ctx): number { return c.respond(); }\n"),
     })
     assert any("go" in str(s) and "respond" in str(t) for s, t in calls), calls
+
+
+def test_a_pure_esm_corpus_still_activates_the_resolver(tmp_path):
+    # `.mjs` and `.cjs` route to extract_js like `.js` does, so a repo that uses
+    # only those must not be the one shape where the resolver never runs.
+    calls, _ = _calls(tmp_path, {
+        "svc.mjs": "export class Svc {\n  doThing() { return 1; }\n}\n",
+        "app.mjs": ('import { Svc } from "./svc.mjs";\nconst s = new Svc();\n'
+                    "export function usesDirect() { return s.doThing(); }\n"),
+    })
+    assert any("usesDirect" in s and "doThing" in t for s, t in calls)