diff --git a/npm/ng-packs/packages/schematics/src/models/index.ts b/npm/ng-packs/packages/schematics/src/models/index.ts
index 36eadc54d9..fb5e9f5639 100644
--- a/npm/ng-packs/packages/schematics/src/models/index.ts
+++ b/npm/ng-packs/packages/schematics/src/models/index.ts
@@ -5,4 +5,5 @@ export * from './model';
 export * from './project';
 export * from './proxy-config';
 export * from './service';
+export * from './tree';
 export * from './util';
diff --git a/npm/ng-packs/packages/schematics/src/models/tree.ts b/npm/ng-packs/packages/schematics/src/models/tree.ts
new file mode 100644
index 0000000000..3c17cfcb10
--- /dev/null
+++ b/npm/ng-packs/packages/schematics/src/models/tree.ts
@@ -0,0 +1 @@
+export type WriteOp = 'create' | 'overwrite';