var defineBuiltIn = require('../internals/define-built-in'); var errorToString = require('../internals/error-to-string'); var ErrorPrototype = Error.prototype; // `Error.prototype.toString` method fix // https://tc39.es/ecma262/#sec-error.prototype.tostring if (ErrorPrototype.toString !== errorToString) { defineBuiltIn(ErrorPrototype, 'toString', errorToString); }