@freezed snippet.

snippets|dart.json

{
  "freezed":{
    "prefix": "freezed",
    "body": [
      "import 'package:flutter/foundation.dart';",
      "import 'package:freezed_annotation/freezed_annotation.dart';",
      "",
      "part '$1.freezed.dart';",
      "part '$1.g.dart';",
      "",
      "@freezed",
      "abstract class $2 with _$$2 {",
      "  const factory $2({}) = _$2;",
      "",
      "  factory $2.fromJson(Map<String, dynamic> json) => _$$2FromJson(json);",
      "}",
    ],
    "description": "Add freezed model"
  }
}