feat: add Omissible utility type to schematics

npm/ng-packs/packages/schematics/src/models/index.ts

@@ -1,2 +1,3 @@
 export * from './api-definition';
 export * from './project';
+export * from './util';

npm/ng-packs/packages/schematics/src/models/util.ts

@@ -0,0 +1,2 @@
+// Omissible (given keys will become optional)
+export type Omissible<T, K extends keyof T> = Partial<Pick<T, K>> & Omit<T, K>;