get_it

import 'package:get_it/get_it.dart';

// main.dart
import 'package:get_it/get_it.dart';

GetIt.I.registerSingleton<Local
Dart
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GetIt.I.registerSingleton<LocalDatabase>(database); when define

database is registered under instance I

GetIt.I<LocalDatabase>().getCategoryColors(), when use

call getCategoryColors() method under instance I

import 'package:flutter/material.dart';
import 'package:get_it/get_it.dart';

void main() async {
  WidgetsFlutterBinding.ensureInitialized();
  await initializeDateFormatting();

  final database = LocalDatabase();

  final colors = await database.getCategoryColors();

  // add Dependency Injection here
  GetIt.I.registerSingleton<LocalDatabase>(database);

  runApp(MaterialApp(
    debugShowCheckedModeBanner: false,
    theme: ThemeData(
      fontFamily: "NotoSans",
      useMaterial3: true,
      colorScheme: lightColorScheme,
      inputDecorationTheme: CustomInputTheme().theme(),
    ),
    home: HomeScreen(),
  ));
}
Dart
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FutureBuilder<List<CategoryColor>>(
  future: GetIt.I<LocalDatabase>().getCategoryColors(),  // call database
  builder: (context, snapshot) {
    return _ColorPicker(
      colors: snapshot.hasData
          ? snapshot.data!
          .map((e) => Color(int.parse('FF${e.hexCode}', radix: 16,),),).toList()
          : [],
    );
  },
),
Dart
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Reference

get_it | Dart Package

Simple direct Service Locator that allows to decouple the interface from a concrete implementation and to access the concrete implementation from everywhere in your App"

https://pub.dev/packages/get_it