diff --git a/nomdl/codegen/code/generate.go b/nomdl/codegen/code/generate.go
index c92537d31b..109f172497 100644
--- a/nomdl/codegen/code/generate.go
+++ b/nomdl/codegen/code/generate.go
@@ -429,18 +429,18 @@ func firstToLower(s string) string {
 	return string(b)
 }
 
-// ToTypeJS returns a string containing Go code that instantiates a Type instance equivalent to t for JavaScript.
-func (gen *Generator) ToTypeJS(t types.Type, fileID, nomsName string, indent int) string {
+// ToTypeValueJS returns a string containing JS code that instantiates a Type instance equivalent to t for JavaScript.
+func (gen *Generator) ToTypeValueJS(t types.Type, inPackageDef bool, indent int) string {
 	d.Chk.True(!t.HasPackageRef() && !t.IsUnresolved() || t.HasOrdinal(), "%s does not have an ordinal set", t.Name())
 	if t.HasPackageRef() {
 		return fmt.Sprintf(`%s(%s.parse('%s'), %d)`, gen.ImportJS("makeType"), gen.ImportJS("Ref"), t.PackageRef().String(), t.Ordinal())
 	}
 
 	if t.IsUnresolved() {
-		if fileID != "" {
-			return fmt.Sprintf(`%s.makeType(__packageInFile_%s_CachedRef, %d)`, nomsName, fileID, t.Ordinal())
+		if inPackageDef {
+			return fmt.Sprintf(`%s(new %s(), %d)`, gen.ImportJS("makeType"), gen.ImportJS("Ref"), t.Ordinal())
 		}
-		return fmt.Sprintf(`%s(new %s(), %d)`, gen.ImportJS("makeType"), gen.ImportJS("Ref"), t.Ordinal())
+		return fmt.Sprintf("%s(_pkg.ref, %d)", gen.ImportJS("makeType"), t.Ordinal())
 	}
 
 	if types.IsPrimitiveKind(t.Kind()) {
@@ -451,7 +451,7 @@ func (gen *Generator) ToTypeJS(t types.Type, fileID, nomsName string, indent int
 	case types.CompoundDesc:
 		types := make([]string, len(desc.ElemTypes))
 		for i, t := range desc.ElemTypes {
-			types[i] = gen.ToTypeJS(t, fileID, nomsName, 0)
+			types[i] = gen.ToTypeValueJS(t, inPackageDef, 0)
 		}
 		return fmt.Sprintf(`%s(%s.%s, %s)`, gen.ImportJS("makeCompoundType"), gen.ImportJS("Kind"), kindToString(t.Kind()), strings.Join(types, ", "))
 	case types.EnumDesc:
@@ -460,7 +460,7 @@ func (gen *Generator) ToTypeJS(t types.Type, fileID, nomsName string, indent int
 		flatten := func(f []types.Field) string {
 			out := make([]string, 0, len(f))
 			for _, field := range f {
-				out = append(out, fmt.Sprintf(`%snew %s('%s', %s, %t),`, ind(indent+1), gen.ImportJS("Field"), field.Name, gen.ToTypeJS(field.T, fileID, nomsName, 0), field.Optional))
+				out = append(out, fmt.Sprintf(`%snew %s('%s', %s, %t),`, ind(indent+1), gen.ImportJS("Field"), field.Name, gen.ToTypeValueJS(field.T, inPackageDef, 0), field.Optional))
 			}
 			return strings.Join(out, "\n")
 		}
diff --git a/nomdl/codegen/codegen.go b/nomdl/codegen/codegen.go
index d3f2236e19..867a384e94 100644
--- a/nomdl/codegen/codegen.go
+++ b/nomdl/codegen/codegen.go
@@ -277,7 +277,7 @@ func (gen *codeGen) readTemplates() *template.Template {
 			"defToUser":            gen.generator.DefToUser,
 			"defToValue":           gen.generator.DefToValue,
 			"defType":              gen.generator.DefType,
-			"importJs":             gen.generator.ImportJS,
+			"importJS":             gen.generator.ImportJS,
 			"importJsType":         gen.generator.ImportJSType,
 			"isLast":               gen.generator.IsLast,
 			"mayHaveChunks":        gen.generator.MayHaveChunks,
@@ -285,7 +285,7 @@ func (gen *codeGen) readTemplates() *template.Template {
 			"refToJSIdentfierName": gen.generator.RefToJSIdentfierName,
 			"title":                strings.Title,
 			"toTypesType":          gen.generator.ToType,
-			"toTypesTypeJS":        gen.generator.ToTypeJS,
+			"toTypeValueJS":        gen.generator.ToTypeValueJS,
 			"userToDef":            gen.generator.UserToDef,
 			"userToValue":          gen.generator.UserToValue,
 			"userType":             gen.generator.UserType,
diff --git a/nomdl/codegen/js/list.tmpl b/nomdl/codegen/js/list.tmpl
index 889995a8dd..9094ed8f32 100644
--- a/nomdl/codegen/js/list.tmpl
+++ b/nomdl/codegen/js/list.tmpl
@@ -1 +1,4 @@
-{{/* Lists in JS needs no codegen */}}
\ No newline at end of file
+
+export function new{{userType .Type}}(values: Array<{{userTypeJS .ElemType}}>): Promise<{{importJsType "NomsList"}}<{{userTypeJS .ElemType}}>> {
+  return {{importJS "newList"}}(values, {{importJS "makeListType"}}({{toTypeValueJS .ElemType false 0}}));
+}
diff --git a/nomdl/codegen/js/map.tmpl b/nomdl/codegen/js/map.tmpl
index 29dd64eaea..7594bc9989 100644
--- a/nomdl/codegen/js/map.tmpl
+++ b/nomdl/codegen/js/map.tmpl
@@ -1 +1,4 @@
-{{/* Maps in JS needs no codegen */}}
\ No newline at end of file
+
+export function new{{userType .Type}}(values: Array<any>): Promise<{{importJsType "NomsMap"}}<{{userTypeJS .KeyType}}, {{userTypeJS .ValueType}}>> {
+  return {{importJS "newMap"}}(values, {{importJS "makeMapType"}}({{toTypeValueJS .KeyType false 0}}, {{toTypeValueJS .ValueType false 0}}));
+}
diff --git a/nomdl/codegen/js/package.tmpl b/nomdl/codegen/js/package.tmpl
index e4f8edaa9a..1e8c17dca6 100644
--- a/nomdl/codegen/js/package.tmpl
+++ b/nomdl/codegen/js/package.tmpl
@@ -1,10 +1,10 @@
 {{if .HasTypes}}
-const _pkg = new {{importJs "Package"}}([{{range $i, $t := .Types}}
-  {{toTypesTypeJS $t "" "_noms" 3}},{{end}}
+const _pkg = new {{importJS "Package"}}([{{range $i, $t := .Types}}
+  {{toTypeValueJS $t true 3}},{{end}}
 ], [{{range $deps := .Dependencies}}
-  {{importJs "Ref"}}.parse('{{$deps}}'),{{end}}
+  {{importJS "Ref"}}.parse('{{$deps}}'),{{end}}
 ]);
-{{importJs "registerPackage"}}(_pkg);{{range $i, $t := .Types}}
-export const typeFor{{userType $t}} = {{importJs "makeType"}}(_pkg.ref, {{$i}});
+{{importJS "registerPackage"}}(_pkg);{{range $i, $t := .Types}}
+export const typeFor{{userType $t}} = {{importJS "makeType"}}(_pkg.ref, {{$i}});
 const {{userType $t}}$typeDef = _pkg.types[{{$i}}];{{end}}
 {{end}}
diff --git a/nomdl/codegen/js/set.tmpl b/nomdl/codegen/js/set.tmpl
index 6a84292a43..4f8d668968 100644
--- a/nomdl/codegen/js/set.tmpl
+++ b/nomdl/codegen/js/set.tmpl
@@ -1 +1,4 @@
-{{/* Sets in JS needs no codegen */}}
\ No newline at end of file
+
+export function new{{userType .Type}}(values: Array<{{userTypeJS .ElemType}}>): Promise<{{importJsType "NomsSet"}}<{{userTypeJS .ElemType}}>> {
+  return {{importJS "newSet"}}(values, {{importJS "makeSetType"}}({{toTypeValueJS .ElemType false 0}}));
+}
diff --git a/nomdl/codegen/js/struct.tmpl b/nomdl/codegen/js/struct.tmpl
index 24278d3935..d2a4ff6537 100644
--- a/nomdl/codegen/js/struct.tmpl
+++ b/nomdl/codegen/js/struct.tmpl
@@ -11,4 +11,4 @@ interface {{.Name}}$Interface extends {{importJsType "Struct"}} {
   set{{title .Name}}(value: {{userTypeJS .T}}): {{$name}}$Interface;{{end}}
 }
 
-export const {{.Name}}: Class<{{.Name}}$Interface> = {{importJs "createStructClass"}}(typeFor{{userType .Type}}, {{userType .Type}}$typeDef);
+export const {{.Name}}: Class<{{.Name}}$Interface> = {{importJS "createStructClass"}}(typeFor{{userType .Type}}, {{userType .Type}}$typeDef);
diff --git a/nomdl/codegen/test/gen/list_int64.noms.js b/nomdl/codegen/test/gen/list_int64.noms.js
index 28aece7893..0dfd441e3c 100644
--- a/nomdl/codegen/test/gen/list_int64.noms.js
+++ b/nomdl/codegen/test/gen/list_int64.noms.js
@@ -2,4 +2,17 @@
 // @flow
 /* eslint-disable */
 
+import {
+  int64Type as _int64Type,
+  makeListType as _makeListType,
+  newList as _newList,
+} from '@attic/noms';
+import type {
+  NomsList as _NomsList,
+  int64 as _int64,
+} from '@attic/noms';
 
+
+export function newListOfInt64(values: Array<_int64>): Promise<_NomsList<_int64>> {
+  return _newList(values, _makeListType(_int64Type));
+}
diff --git a/nomdl/codegen/test/gen/map.noms.js b/nomdl/codegen/test/gen/map.noms.js
index 28aece7893..4b8cc709e9 100644
--- a/nomdl/codegen/test/gen/map.noms.js
+++ b/nomdl/codegen/test/gen/map.noms.js
@@ -2,4 +2,23 @@
 // @flow
 /* eslint-disable */
 
+import {
+  boolType as _boolType,
+  makeMapType as _makeMapType,
+  newMap as _newMap,
+  stringType as _stringType,
+  valueType as _valueType,
+} from '@attic/noms';
+import type {
+  NomsMap as _NomsMap,
+  Value as _Value,
+} from '@attic/noms';
 
+
+export function newMapOfBoolToString(values: Array<any>): Promise<_NomsMap<boolean, string>> {
+  return _newMap(values, _makeMapType(_boolType, _stringType));
+}
+
+export function newMapOfStringToValue(values: Array<any>): Promise<_NomsMap<string, _Value>> {
+  return _newMap(values, _makeMapType(_stringType, _valueType));
+}
diff --git a/nomdl/codegen/test/gen/ref.noms.js b/nomdl/codegen/test/gen/ref.noms.js
index 9c3cd9be5d..642d66ab6e 100644
--- a/nomdl/codegen/test/gen/ref.noms.js
+++ b/nomdl/codegen/test/gen/ref.noms.js
@@ -9,11 +9,17 @@ import {
   createStructClass as _createStructClass,
   float32Type as _float32Type,
   makeCompoundType as _makeCompoundType,
+  makeListType as _makeListType,
+  makeSetType as _makeSetType,
   makeStructType as _makeStructType,
   makeType as _makeType,
+  newList as _newList,
+  newSet as _newSet,
   registerPackage as _registerPackage,
+  stringType as _stringType,
 } from '@attic/noms';
 import type {
+  NomsList as _NomsList,
   NomsSet as _NomsSet,
   RefValue as _RefValue,
   Struct as _Struct,
@@ -47,3 +53,15 @@ interface StructWithRef$Interface extends _Struct {
 }
 
 export const StructWithRef: Class<StructWithRef$Interface> = _createStructClass(typeForStructWithRef, StructWithRef$typeDef);
+
+export function newListOfRefOfFloat32(values: Array<_RefValue<_float32>>): Promise<_NomsList<_RefValue<_float32>>> {
+  return _newList(values, _makeListType(_makeCompoundType(_Kind.Ref, _float32Type)));
+}
+
+export function newListOfString(values: Array<string>): Promise<_NomsList<string>> {
+  return _newList(values, _makeListType(_stringType));
+}
+
+export function newSetOfFloat32(values: Array<_float32>): Promise<_NomsSet<_float32>> {
+  return _newSet(values, _makeSetType(_float32Type));
+}
diff --git a/nomdl/codegen/test/gen/set.noms.js b/nomdl/codegen/test/gen/set.noms.js
index 28aece7893..61a6861419 100644
--- a/nomdl/codegen/test/gen/set.noms.js
+++ b/nomdl/codegen/test/gen/set.noms.js
@@ -2,4 +2,16 @@
 // @flow
 /* eslint-disable */
 
+import {
+  boolType as _boolType,
+  makeSetType as _makeSetType,
+  newSet as _newSet,
+} from '@attic/noms';
+import type {
+  NomsSet as _NomsSet,
+} from '@attic/noms';
 
+
+export function newSetOfBool(values: Array<boolean>): Promise<_NomsSet<boolean>> {
+  return _newSet(values, _makeSetType(_boolType));
+}
diff --git a/nomdl/codegen/test/gen/sha1_b3ecb0f.js b/nomdl/codegen/test/gen/sha1_b3ecb0f.js
index f7666962fd..65cb5df6d0 100644
--- a/nomdl/codegen/test/gen/sha1_b3ecb0f.js
+++ b/nomdl/codegen/test/gen/sha1_b3ecb0f.js
@@ -9,8 +9,10 @@ import {
   blobType as _blobType,
   createStructClass as _createStructClass,
   makeCompoundType as _makeCompoundType,
+  makeListType as _makeListType,
   makeStructType as _makeStructType,
   makeType as _makeType,
+  newList as _newList,
   registerPackage as _registerPackage,
 } from '@attic/noms';
 import type {
@@ -46,3 +48,11 @@ interface A$Interface extends _Struct {
 }
 
 export const A: Class<A$Interface> = _createStructClass(typeForA, A$typeDef);
+
+export function newListOfListOfBlob(values: Array<_NomsList<_Blob>>): Promise<_NomsList<_NomsList<_Blob>>> {
+  return _newList(values, _makeListType(_makeCompoundType(_Kind.List, _blobType)));
+}
+
+export function newListOfBlob(values: Array<_Blob>): Promise<_NomsList<_Blob>> {
+  return _newList(values, _makeListType(_blobType));
+}
diff --git a/nomdl/codegen/test/gen/struct.noms.js b/nomdl/codegen/test/gen/struct.noms.js
index 9525ee7355..e5bde27975 100644
--- a/nomdl/codegen/test/gen/struct.noms.js
+++ b/nomdl/codegen/test/gen/struct.noms.js
@@ -7,12 +7,15 @@ import {
   Package as _Package,
   boolType as _boolType,
   createStructClass as _createStructClass,
+  makeListType as _makeListType,
   makeStructType as _makeStructType,
   makeType as _makeType,
+  newList as _newList,
   registerPackage as _registerPackage,
   stringType as _stringType,
 } from '@attic/noms';
 import type {
+  NomsList as _NomsList,
   Struct as _Struct,
 } from '@attic/noms';
 
@@ -47,3 +50,7 @@ interface Struct$Interface extends _Struct {
 }
 
 export const Struct: Class<Struct$Interface> = _createStructClass(typeForStruct, Struct$typeDef);
+
+export function newListOfStruct(values: Array<Struct>): Promise<_NomsList<Struct>> {
+  return _newList(values, _makeListType(_makeType(_pkg.ref, 0)));
+}
diff --git a/nomdl/codegen/test/gen/struct_recursive.noms.js b/nomdl/codegen/test/gen/struct_recursive.noms.js
index 02396ef754..d52a8e4893 100644
--- a/nomdl/codegen/test/gen/struct_recursive.noms.js
+++ b/nomdl/codegen/test/gen/struct_recursive.noms.js
@@ -9,8 +9,10 @@ import {
   Ref as _Ref,
   createStructClass as _createStructClass,
   makeCompoundType as _makeCompoundType,
+  makeListType as _makeListType,
   makeStructType as _makeStructType,
   makeType as _makeType,
+  newList as _newList,
   registerPackage as _registerPackage,
 } from '@attic/noms';
 import type {
@@ -45,3 +47,7 @@ interface Tree$Interface extends _Struct {
 }
 
 export const Tree: Class<Tree$Interface> = _createStructClass(typeForTree, Tree$typeDef);
+
+export function newListOfTree(values: Array<Tree>): Promise<_NomsList<Tree>> {
+  return _newList(values, _makeListType(_makeType(_pkg.ref, 0)));
+}
diff --git a/nomdl/codegen/test/gen/struct_with_dup_list.noms.js b/nomdl/codegen/test/gen/struct_with_dup_list.noms.js
index 65da8d7bc1..7020e5f2c4 100644
--- a/nomdl/codegen/test/gen/struct_with_dup_list.noms.js
+++ b/nomdl/codegen/test/gen/struct_with_dup_list.noms.js
@@ -8,8 +8,10 @@ import {
   Package as _Package,
   createStructClass as _createStructClass,
   makeCompoundType as _makeCompoundType,
+  makeListType as _makeListType,
   makeStructType as _makeStructType,
   makeType as _makeType,
+  newList as _newList,
   registerPackage as _registerPackage,
   uint8Type as _uint8Type,
 } from '@attic/noms';
@@ -46,3 +48,7 @@ interface StructWithDupList$Interface extends _Struct {
 }
 
 export const StructWithDupList: Class<StructWithDupList$Interface> = _createStructClass(typeForStructWithDupList, StructWithDupList$typeDef);
+
+export function newListOfUint8(values: Array<_uint8>): Promise<_NomsList<_uint8>> {
+  return _newList(values, _makeListType(_uint8Type));
+}
diff --git a/nomdl/codegen/test/gen/struct_with_imports.noms.js b/nomdl/codegen/test/gen/struct_with_imports.noms.js
index 91d15e7056..9ccf3bbba6 100644
--- a/nomdl/codegen/test/gen/struct_with_imports.noms.js
+++ b/nomdl/codegen/test/gen/struct_with_imports.noms.js
@@ -8,11 +8,14 @@ import {
   Ref as _Ref,
   createStructClass as _createStructClass,
   makeEnumType as _makeEnumType,
+  makeListType as _makeListType,
   makeStructType as _makeStructType,
   makeType as _makeType,
+  newList as _newList,
   registerPackage as _registerPackage,
 } from '@attic/noms';
 import type {
+  NomsList as _NomsList,
   Struct as _Struct,
 } from '@attic/noms';
 import * as dep from './sha1_eda4273.js';
@@ -57,3 +60,7 @@ interface ImportUser$Interface extends _Struct {
 }
 
 export const ImportUser: Class<ImportUser$Interface> = _createStructClass(typeForImportUser, ImportUser$typeDef);
+
+export function newListOfD(values: Array<dep.D>): Promise<_NomsList<dep.D>> {
+  return _newList(values, _makeListType(_makeType(_Ref.parse('sha1-eda4273cba9d5d4a1bccf41bcaec64743863cde0'), 0)));
+}
diff --git a/nomdl/codegen/test/gen/struct_with_union_field.noms.js b/nomdl/codegen/test/gen/struct_with_union_field.noms.js
index 70acc7dc4e..167d63111c 100644
--- a/nomdl/codegen/test/gen/struct_with_union_field.noms.js
+++ b/nomdl/codegen/test/gen/struct_with_union_field.noms.js
@@ -11,8 +11,10 @@ import {
   float32Type as _float32Type,
   float64Type as _float64Type,
   makeCompoundType as _makeCompoundType,
+  makeSetType as _makeSetType,
   makeStructType as _makeStructType,
   makeType as _makeType,
+  newSet as _newSet,
   registerPackage as _registerPackage,
   stringType as _stringType,
   uint8Type as _uint8Type,
@@ -69,3 +71,7 @@ interface StructWithUnionField$Interface extends _Struct {
 }
 
 export const StructWithUnionField: Class<StructWithUnionField$Interface> = _createStructClass(typeForStructWithUnionField, StructWithUnionField$typeDef);
+
+export function newSetOfUint8(values: Array<_uint8>): Promise<_NomsSet<_uint8>> {
+  return _newSet(values, _makeSetType(_uint8Type));
+}
diff --git a/nomdl/codegen/test/list-int64-test.js b/nomdl/codegen/test/list-int64-test.js
new file mode 100644
index 0000000000..646963cba2
--- /dev/null
+++ b/nomdl/codegen/test/list-int64-test.js
@@ -0,0 +1,14 @@
+// @flow
+
+import {assert} from 'chai';
+import {suite, test} from 'mocha';
+import {newListOfInt64} from './gen/list_int64.noms.js';
+import {makeListType, int64Type} from '@attic/noms';
+
+suite('list_int64.noms', () => {
+  test('constructor', async () => {
+    const l = await newListOfInt64([0, 1, 2, 3]);
+    assert.equal(l.length, 4);
+    assert.isTrue(l.type.equals(makeListType(int64Type)));
+  });
+});
diff --git a/nomdl/codegen/test/map-test.js b/nomdl/codegen/test/map-test.js
new file mode 100644
index 0000000000..7eac224cca
--- /dev/null
+++ b/nomdl/codegen/test/map-test.js
@@ -0,0 +1,13 @@
+// @flow
+
+import {assert} from 'chai';
+import {suite, test} from 'mocha';
+import {newMapOfBoolToString} from './gen/map.noms.js';
+import {makeMapType, boolType, stringType} from '@attic/noms';
+
+suite('map.noms', () => {
+  test('constructor', async () => {
+    const s = await newMapOfBoolToString([true, 'yes', false, 'no']);
+    assert.isTrue(s.type.equals(makeMapType(boolType, stringType)));
+  });
+});
diff --git a/nomdl/codegen/test/package.json b/nomdl/codegen/test/package.json
index 56b2251790..c3d3bea82a 100644
--- a/nomdl/codegen/test/package.json
+++ b/nomdl/codegen/test/package.json
@@ -9,7 +9,7 @@
   "author": "",
   "license": "ISC",
   "devDependencies": {
-    "@attic/noms": "^7.6.0",
+    "@attic/noms": "^7.6.1",
     "babel-cli": "6.6.5",
     "babel-core": "6.7.2",
     "babel-eslint": "5.0.0",
diff --git a/nomdl/codegen/test/set-test.js b/nomdl/codegen/test/set-test.js
new file mode 100644
index 0000000000..9816244945
--- /dev/null
+++ b/nomdl/codegen/test/set-test.js
@@ -0,0 +1,13 @@
+// @flow
+
+import {assert} from 'chai';
+import {suite, test} from 'mocha';
+import {newSetOfBool} from './gen/set.noms.js';
+import {makeSetType, boolType} from '@attic/noms';
+
+suite('set.noms', () => {
+  test('constructor', async () => {
+    const s = await newSetOfBool([true]);
+    assert.isTrue(s.type.equals(makeSetType(boolType)));
+  });
+});
diff --git a/nomdl/codegen/test/struct-optional-test.js b/nomdl/codegen/test/struct-optional-test.js
new file mode 100644
index 0000000000..6dd31b5bd9
--- /dev/null
+++ b/nomdl/codegen/test/struct-optional-test.js
@@ -0,0 +1,25 @@
+// @flow
+
+import {assert} from 'chai';
+import {suite, test} from 'mocha';
+
+import {OptionalStruct} from './gen/struct_optional.noms.js';
+
+suite('struct_optional.noms', () => {
+  test('constructor', async () => {
+    const os = new OptionalStruct({});
+    assert.isUndefined(os.s);
+    assert.isUndefined(os.b);
+
+    const os2 = os.setS('hi');
+    assert.equal(os2.s, 'hi');
+    assert.isUndefined(os2.b);
+
+    const os3 = os2.setB(true);
+    assert.equal(os3.s, 'hi');
+    assert.equal(os3.b, true);
+
+    const os4 = os2.setB(undefined).setS(undefined);
+    assert.isTrue(os4.equals(os));
+  });
+});
diff --git a/nomdl/codegen/test/struct-recursive-test.js b/nomdl/codegen/test/struct-recursive-test.js
index e69ab559ba..d2e3dc9b67 100644
--- a/nomdl/codegen/test/struct-recursive-test.js
+++ b/nomdl/codegen/test/struct-recursive-test.js
@@ -2,7 +2,7 @@
 
 import {assert} from 'chai';
 import {suite, test} from 'mocha';
-import {Tree, typeForTree} from './gen/struct_recursive.noms.js';
+import {Tree, typeForTree, newListOfTree} from './gen/struct_recursive.noms.js';
 import {newList, makeListType} from '@attic/noms';
 
 suite('struct_recursive.noms', () => {
@@ -13,5 +13,11 @@ suite('struct_recursive.noms', () => {
       new Tree({children: await newList([], listOfTreeType)}),
     ], listOfTreeType)});
     assert.equal(t.children.length, 2);
+
+    const t2: Tree = new Tree({children: await newListOfTree([
+      new Tree({children: await newListOfTree([])}),
+      new Tree({children: await newListOfTree([])}),
+    ])});
+    assert.isTrue(t.equals(t2));
   });
 });