
Synta圎rror: missing : after property id.
Synta圎rror: Malformed formal parameter. Synta圎rror: invalid regular expression flag "x". Synta圎rror: invalid assignment left-hand side. Synta圎rror: identifier starts immediately after numeric literal. Synta圎rror: function statement requires a name. Synta圎rror: for-in loop head declarations may not have initializers. Synta圎rror: cannot use `?` unparenthesized within `||` and `&` expressions. Synta圎rror: applying the 'delete' operator to an unqualified name is deprecated. Synta圎rror: a declaration in the head of a for-of loop can't have an initializer. Synta圎rror: "x" is a reserved identifier. Synta圎rror: "use strict" not allowed in function with non-simple parameters. Synta圎rror: "0"-prefixed octal literals and octal escape seq. ReferenceError: reference to undefined property "x". ReferenceError: deprecated caller or arguments usage. ReferenceError: can't access lexical declaration 'X' before initialization. ReferenceError: assignment to undeclared variable "x". RangeError: x can't be converted to BigInt because it isn't an integer. RangeError: repeat count must be non-negative. RangeError: repeat count must be less than infinity. RangeError: argument is not a valid code point. Error: Permission denied to access property "x".
Enumerability and ownership of properties.