feat: add barrel export generator utility fn

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

@@ -0,0 +1,43 @@
+import { strings } from '@angular-devkit/core';
+import { Tree } from '@angular-devkit/schematics';
+import { PROXY_PATH } from '../constants';
+import { createFileSaver } from './file';
+
+export function createProxyIndexGenerator(targetPath: string) {
+  return createBarrelsGenerator(targetPath + PROXY_PATH);
+}
+
+export function createBarrelsGenerator(rootPath: string) {
+  return (tree: Tree) => {
+    generateBarrelFromPath(tree, rootPath);
+    return tree;
+  };
+}
+
+export function generateBarrelFromPath(tree: Tree, indexPath: string) {
+  const saveFile = createFileSaver(tree);
+  const dir = tree.getDir(indexPath);
+
+  let _exports = '';
+
+  dir.subfiles.forEach(fragment => {
+    if (!fragment.endsWith('.ts')) return;
+
+    _exports += `export * from './${fragment.replace(/\.ts$/, '')}';
+`;
+  });
+
+  dir.subdirs.forEach(fragment => {
+    const subDirPath = indexPath + '/' + fragment;
+    const subDir = tree.getDir(subDirPath);
+    let hasFiles = false;
+    subDir.visit(() => (hasFiles = true));
+    if (!hasFiles) return;
+
+    _exports += `export * as ${strings.classify(fragment)} from './${fragment}';
+`;
+    generateBarrelFromPath(tree, subDirPath);
+  });
+
+  if (_exports) saveFile(indexPath + '/index.ts', _exports);
+}

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

@@ -1,6 +1,7 @@
 export * from './angular';
 export * from './api';
 export * from './ast';
+export * from './barrel';
 export * from './common';
 export * from './enum';
 export * from './file';