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node_modules/react-native/scripts/packager-reporter.js

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+/**
+ * Copyright (c) Meta Platforms, Inc. and affiliates.
+ *
+ * This source code is licensed under the MIT license found in the
+ * LICENSE file in the root directory of this source tree.
+ *
+ * @flow strict-local
+ * @format
+ */
+
+'use strict';
+
+let reporter /*: $FlowFixMe */;
+
+const logPath = process.env.RCT_PACKAGER_LOG_PATH;
+if (logPath != null && logPath !== '') {
+  const {JsonReporter} = require('metro');
+  const fs = require('fs');
+  const path = require('path');
+  // $FlowFixMe[missing-type-arg]
+  reporter = class extends JsonReporter {
+    constructor() {
+      fs.mkdirSync(path.dirname(logPath), {
+        recursive: true,
+      });
+      super(fs.createWriteStream(logPath));
+    }
+  };
+} else {
+  reporter = require('metro').TerminalReporter;
+}
+
+module.exports = reporter;