https://twitter.com/niku_name/status/1238394633173884930

dart.json

{
  "make equality properly": {
    "prefix": "eq",
    "body": [
      "@override",
      "bool operator ==(Object other) =>",
      "  identical(this, other) ||",
      "  other is $1 &&",
      "  runtimeType == other.runtimeType${2/ ([^ ]+)/ && ${1} == other.${1}/g};",
      "",
      "@override",
      "int get hashCode =>${2/ ([^ ]+)/ ${1}.hashCode ^/g}$0;"
    ]
  }
}