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const FlutterErrorDetails({
  required this.exception,
  this.stack,
  this.library = 'Flutter framework',
  this.context,
  this.stackFilter,
  this.informationCollector,
  this.silent = false,
}) : assert(exception != null);

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return MaterialApp(
  ...,
  builder: (context, widget) {
    // このbuildeｒを上書きするだけ
    ErrorWidget.builder = (FlutterErrorDetails errorDetails) {
      return CustomErrorPage(errorDetails: errorDetails);
    };
    return widget!;
  },
  home: ...,

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SingleChildScrollView(
  child: Column(
    children: [
      const Text('Hoge'),
      ListView.builder(
        shrinkWrap: true,                              // 肝は
        physics: const NeverScrollableScrollPhysics(), // この2つ
        itemCount: 100,
        itemBuilder: (_, index) => Text(
          '$index',

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static Route<void> route() {
  return PageRouteBuilder<void>(
    pageBuilder: (_, __, ___) => const SomeScreen(),
    transitionDuration: Duration.zero, // ここ
  );
}

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{
	"freezed snippet": {
		"scope": "dart",
		"prefix": "freezed",
		"body": [
			"import 'package:flutter/foundation.dart';",
			"import 'package:freezed_annotation/freezed_annotation.dart';",
			"",
			"part '$TM_FILENAME_BASE.freezed.dart';",
			"part '$TM_FILENAME_BASE.g.dart';",

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import 'package:flutter/foundation.dart';
import 'package:freezed_annotation/freezed_annotation.dart';

part 'sample_model.freezed.dart';
part 'sample_model.g.dart';

@freezed
class SampleModel with _$SampleModel {
  factory SampleModel({
    required String id,

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import 'dart:convert';

import 'packages:http/http.dart' as http;

Future<void> fetchSomethingRequest() async {
  const url = '...';
  final response = await http.get(url);
  if (response.statusCode != 200) {
    throw Exception('Something occurred.');
  }

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import 'dart:convert';

import 'packages:http/http.dart' as http;

Futur<void> fetchSomethingRequest() async {
  const url = '...';
  http.get(url).then((response) {
    if (response.statusCode != 200) {
      throw Exception('Something occurred.');
    }

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import 'dart:convert';

import 'packages:http/http.dart' as http;

Future<void> fetchSomethingRequest() {
  const url = '...';
  return http.get(url).then((response) {
    if (response.statusCode != 200) {
      throw Exception('Something occurred.');
    }

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import 'dart:convert';

import 'packages:http/http.dart' as http;

void fetchSomethingRequest(BuildContext context) {
  final scaffold = Scaffold.of(context);
  const url = '...';
  http.get(url).then((response) {
    if (response.statusCode != 200) {
      throw Exception('Something occurred.');