Synta圎rror: test for equality (=) mistyped as assignment (=)?.Synta圎rror: redeclaration of formal parameter 'x'.Synta圎rror: missing = in const declaration.Synta圎rror: missing } after property list.Synta圎rror: missing } after function body.Synta圎rror: missing ] after element list.Synta圎rror: missing ) after argument list.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.

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