Dart Part Of Directive

// Modern URI-based syntax (Recommended)
part of 'parent_library.dart';

// Legacy library-name syntax
part of my_library_name;

// Optional library declaration
library network_module;

// All imports must reside in the parent file
import 'dart:convert';
import 'package:http/http.dart' as http;

// Link to the subordinate file
part 'src/network_parser.dart';

// Private member accessible by the part file
String _baseUrl = "https://api.example.com";

class NetworkClient {
  void fetch() {
    // Can access members defined in the part file
    _parseResponse(); 
  }
}

// Link back to the parent file using a relative URI
part of '../network_module.dart';

// No imports are allowed here

void _parseResponse() {
  // Accesses the private variable from network_module.dart
  print("Parsing data from $_baseUrl");
  
  // Accesses the dart:convert library imported in the parent
  jsonDecode('{"status": "ok"}'); 
}