diff --git a/src/arr/trove/tables.arr b/src/arr/trove/tables.arr
index 79fda3788..656c465b3 100644
--- a/src/arr/trove/tables.arr
+++ b/src/arr/trove/tables.arr
@@ -6,6 +6,7 @@ end
 import global as G
 include from G: raw-array-duplicate end
 include lists
+import table as T
 
 type Reducer<Acc, InVal, OutVal> = {
   one :: (InVal -> {Acc; OutVal}),
@@ -92,7 +93,7 @@ fun is-raw-array-of-rows(ra :: RawArray<Any>) -> Boolean:
   raw-array-fold(lam(base, elt, _): base and is-row(elt) end, true, ra, 0)
 end
 
-fun table-from-raw-array(arr :: RawArray<Any>%(is-raw-array-of-rows)) -> Table:
+fun table-from-raw-array(arr :: T.RawArrayOfRows) -> Table:
   col-names = raw-array-get(arr, 0).get-column-names()
   with-cols = empty-table(col-names)
   for raw-array-fold(t from with-cols, r from arr, _ from 0):
diff --git a/src/js/base/post-load-hooks.js b/src/js/base/post-load-hooks.js
index 60743484e..74c7d5a63 100644
--- a/src/js/base/post-load-hooks.js
+++ b/src/js/base/post-load-hooks.js
@@ -22,7 +22,7 @@ define("pyret-base/js/post-load-hooks", function() {
         runtime["checkEQ"] = runtime.makeCheckType(ffi.isEqualityResult, "EqualityResult");
       },
       "builtin://table": function(table) {
-        table = table.jsmod;
+        table = runtime.getField(runtime.getField(table, "provide-plus-types"), "internal");
         runtime["makeTable"] = table.makeTable;
         runtime["makeRow"] = table.makeRow;
         runtime["makeRowFromArray"] = table.makeRowFromArray;
diff --git a/src/js/trove/reactors.js b/src/js/trove/reactors.js
index 2baca3ca3..e60d33aa7 100644
--- a/src/js/trove/reactors.js
+++ b/src/js/trove/reactors.js
@@ -219,7 +219,9 @@
               i += 1;
               return ans;
             });
-            return tables.makeTable(["tick", "state"], rows);
+            console.log('tables =', tables);
+            return gf(tables, "internal").makeTable(["tick", "state"], rows);
+            // return runtime.makeTable(["tick", "state"], rows);
           }
           else {
             runtime.ffi.throwMessageException("Tried to get trace of a reactor that isn't tracing; try calling start-trace() first");
diff --git a/src/js/trove/table.js b/src/js/trove/table.js
index 4779dc152..6966f6813 100644
--- a/src/js/trove/table.js
+++ b/src/js/trove/table.js
@@ -7,7 +7,11 @@
   nativeRequires: [
     "pyret-base/js/type-util"
   ],
-  provides: {},
+  provides: {
+    types: {
+      'RawArrayOfRows': 'tany'
+    }
+  },
   theModule: function(runtime, namespace, uri, VSlib, EQlib, ffi, t) {
     var get = runtime.getField;
 
@@ -23,6 +27,20 @@
     var brandRow = runtime.namedBrander("row", ["table: row brander"]);
     var annRow   = runtime.makeBranderAnn(brandRow, "Row");
 
+    var ann = function(name, pred) {
+      return runtime.makePrimitiveAnn(name, pred);
+    };
+
+    function isRawArrayOfRows(raor) {
+      if (!Array.isArray(raor)) return false;
+      for (let i = 0; i < raor.length; i++) {
+        if (!runtime.hasBrand(raor[i], brandRow._brand)) return false;
+      }
+      return true;
+    }
+
+    var annRawArrayOfRows = ann("RawArrayOfRows", isRawArrayOfRows);
+
     var rowGetValue = runtime.makeMethod1(function(self, arg) {
         ffi.checkArity(2, arguments, "get-value", true);
         runtime.checkArgsInternal2("tables", "get-value",
@@ -820,16 +838,20 @@
       }));
     }
     
-    return runtime.makeJSModuleReturn({
-        TableAnn : annTable,
-        RowAnn : annRow,
+    var internal = {
         makeTable: makeTable,
         makeRow: makeRow,
         makeRowFromArray: makeRowFromArray,
         openTable: openTable,
         isTable: isTable,
         isRow: isRow
-      },
-      {});
+      };
+    var types = {
+      Table: annTable, 
+      Row: annRow, 
+      RawArrayOfRows: annRawArrayOfRows
+    };
+    var values = {};
+    return runtime.makeModuleReturn(values, types, internal);
   }
 })
diff --git a/tests/pyret/tests/test-tables.arr b/tests/pyret/tests/test-tables.arr
index 65dcd391c..48e7d3710 100644
--- a/tests/pyret/tests/test-tables.arr
+++ b/tests/pyret/tests/test-tables.arr
@@ -692,13 +692,13 @@ check "table-from-rows":
     [list:
       [raw-row: {"A"; 5}, {"B"; 7}, {"C"; 8}],
       [raw-row: {"A"; 1}, {"B"; 2}, {"C"; 3}]]]
-    raises "is-raw-array-of-rows"
+    raises "RawArrayOfRows"
 
   [table-from-rows:
     1, [raw-row: {"A"; 1}, {"B"; 2}],
     false, [raw-row: {"A"; 3}, {"B"; 4}],
     "non-row string", [raw-row: {"A"; 5}, {"B"; 6}]]
-    raises "is-raw-array-of-rows"
+    raises "RawArrayOfRows"
 
   [table-from-rows:
     [raw-row: 5, {"B"; 7}, {"C"; 8}],