implement a multi-file template interpreter

examples/react-app-generator/templates/api-base.tmpl

@@ -0,0 +1,54 @@
+// Base API client configuration
+{{range .AST.Definitions}}{{if .Server}}const API_BASE_URL = process.env.REACT_APP_API_URL || 'http://{{.Server.Settings | getHost}}:{{.Server.Settings | getPort}}';
+{{end}}{{end}}
+
+export interface ApiError {
+  message: string;
+  status: number;
+}
+
+export class ApiError extends Error {
+    status: number;
+
+    constructor(message: string, status: number) {
+        super(message);
+        this.status = status;
+        this.name = 'ApiError';
+    }
+}
+
+export async function apiRequest<T>(
+  method: string,
+  endpoint: string,
+  data?: any
+): Promise<T> {
+  const config: RequestInit = {
+    method,
+    headers: {
+      'Content-Type': 'application/json',
+    },
+  };
+
+  if (data) {
+    config.body = JSON.stringify(data);
+  }
+
+  try {
+    const response = await fetch(`${API_BASE_URL}${endpoint}`, config);
+
+    if (!response.ok) {
+      throw new ApiError(`HTTP error! status: ${response.status}`, response.status);
+    }
+
+    if (response.status === 204) {
+      return null as T;
+    }
+
+    return await response.json();
+  } catch (error) {
+    if (error instanceof ApiError) {
+      throw error;
+    }
+    throw new ApiError(`Network error: ${error instanceof Error ? error.message : 'Unknown error'}`, 0);
+  }
+}