feat: add utility function to read workspace schema

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

@@ -1,2 +1,3 @@
 export * from './angular';
 export * from './text';
+export * from './workspace';

npm/ng-packs/packages/schematics/src/utils/workspace.ts

@@ -0,0 +1,18 @@
+import { experimental } from '@angular-devkit/core';
+import { SchematicsException, Tree } from '@angular-devkit/schematics';
+import { Exception } from '../enums';
+
+export function readWorkspaceSchema(tree: Tree) {
+  const workspaceBuffer = tree.read('/angular.json') || tree.read('/workspace.json');
+  if (!workspaceBuffer) throw new SchematicsException(Exception.NoWorkspace);
+
+  let workspaceSchema: experimental.workspace.WorkspaceSchema;
+
+  try {
+    workspaceSchema = JSON.parse(workspaceBuffer.toString());
+  } catch (_) {
+    throw new SchematicsException(Exception.InvalidWorkspace);
+  }
+
+  return workspaceSchema;
+}