{"ScriptPreparationCode":null,"TestCases":[{"Name":"instanceof","Code":"class NewError extends Error {\r\n constructor() {\r\n super()\r\n this.customProp = \u0027blah\u0027\r\n }\r\n\r\n customProp\r\n}\r\n\r\nconst testErr = new NewError()\r\n\r\ntestErr instanceof NewError","IsDeferred":false},{"Name":"prop test","Code":"class NewError extends Error {\r\n constructor() {\r\n super()\r\n this.customProp = \u0027blah\u0027\r\n }\r\n\r\n customProp\r\n}\r\n\r\nconst testErr = new NewError()\r\n\r\n!!testErr \u0026\u0026 typeof testErr === \u0027object\u0027 \u0026\u0026 \u0027customProp\u0027 in testErr","IsDeferred":false}]}