Use existing environment variables as defaults for the generator command.

turbo/generators/utils/index.ts

@@ -0,0 +1,40 @@
+import { readFileSync } from 'node:fs';
+
+export namespace generator {
+  export function loadAllEnvironmentVariables(basePath: string) {
+    const sharedEnv = loadEnvironmentVariables(basePath + '/.env');
+    const productionEnv = loadEnvironmentVariables(
+      basePath + '/.env.production',
+    );
+
+    return {
+      ...sharedEnv,
+      ...productionEnv,
+    };
+  }
+
+  export function loadEnvironmentVariables(filePath: string) {
+    const file = readFileSync(filePath, 'utf-8');
+    const vars = file.split('\n').filter((line) => line.trim() !== '');
+
+    const env: Record<string, string> = {};
+
+    for (const line of vars) {
+      const isComment = line.startsWith('#');
+
+      if (isComment) {
+        continue;
+      }
+
+      const [key, value] = line.split('=');
+
+      if (!key) {
+        continue;
+      }
+
+      env[key] = value ?? '';
+    }
+
+    return env;
+  }
+}