diff --git a/bex/tag_preprocessor/analyze.py b/bex/tag_preprocessor/analyze.py
index 0c12744..0326896 100644
--- a/bex/tag_preprocessor/analyze.py
+++ b/bex/tag_preprocessor/analyze.py
@@ -220,12 +220,17 @@ def frequency_filter(sequences, min_coverage=0.2):
     return filtered
 
 
+_CALL_ONLY_EXTS = {".ts", ".tsx", ".js", ".jsx", ".mts", ".mjs"}
+
+
 def _preprocess_file(fp):
     """Preprocess one file. Module-level for ProcessPoolExecutor."""
+    ext = os.path.splitext(fp)[1].lower()
+    call_only = ext in _CALL_ONLY_EXTS
     with open(fp) as f:
         code = f.read()
     sequences = []
-    for method_seq in preprocess_by_method(fp, code):
+    for method_seq in preprocess_by_method(fp, code, call_only=call_only):
         if method_seq:
             sequences.append(method_seq)
     return (fp, sequences)
diff --git a/bex/tag_preprocessor/code.py b/bex/tag_preprocessor/code.py
index 45d1b69..9ddb598 100644
--- a/bex/tag_preprocessor/code.py
+++ b/bex/tag_preprocessor/code.py
@@ -359,11 +359,16 @@ def _find_method_bodies(tree):
     return bodies
 
 
-def preprocess_by_method(file_path: str, code: str):
+def preprocess_by_method(file_path: str, code: str, call_only=False):
     """Preprocess and group behavioral tokens by enclosing method body.
 
     Returns list of sequences, one per function/method found.
     Each sequence is [(capture_name, text, line_number), ...].
+
+    Args:
+        call_only: When True, only keep CALL_PREFIXES captures (function
+            calls, method calls). Use for JS/TS where keyword captures
+            produce truncated text due to tree-sitter node boundary issues.
     """
     ext = os.path.splitext(file_path)[1].lower()
     lang, query_name = _load_grammar(ext)
@@ -377,9 +382,10 @@ def preprocess_by_method(file_path: str, code: str):
     cursor = QueryCursor(query)
     captures = cursor.captures(tree.root_node)
 
+    prefix_filter = CALL_PREFIXES if call_only else BEHAVIORAL_PREFIXES
     items = []
     for capname, nodes in captures.items():
-        if not capname.startswith(BEHAVIORAL_PREFIXES):
+        if not capname.startswith(prefix_filter):
             continue
         for node in nodes:
             text = sanitize_symbol(code[node.start_byte:node.end_byte], capname)
@@ -403,7 +409,7 @@ def preprocess_by_method(file_path: str, code: str):
     return sequences
 
 
-def preprocess(file_path: str, code: str):
+def preprocess(file_path: str, code: str, call_only=False):
     ext = os.path.splitext(file_path)[1].lower()
     lang, query_name = _load_grammar(ext)
     query_src = _load_query(query_name)
@@ -420,9 +426,10 @@ def preprocess(file_path: str, code: str):
     cursor = QueryCursor(query)
     captures = cursor.captures(tree.root_node)
 
+    prefix_filter = CALL_PREFIXES if call_only else BEHAVIORAL_PREFIXES
     items = []
     for capname, nodes in captures.items():
-        if not capname.startswith(BEHAVIORAL_PREFIXES):
+        if not capname.startswith(prefix_filter):
             continue
         for node in nodes:
             text = sanitize_symbol(code[node.start_byte:node.end_byte], capname)