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.

Ecmascript 2021