JavaScript ( JS) is a lightweight, interpreted, or just-in-time compiled programming language with first-class functions. Warning: unreachable code after return statement.Warning: -file- is being assigned a //# sourceMappingURL, but already has one.TypeError: X.prototype.y called on incompatible type.TypeError: setting getter-only property "x".TypeError: Reduce of empty array with no initial value.TypeError: property "x" is non-configurable and can't be deleted.TypeError: invalid assignment to const "x".TypeError: invalid 'instanceof' operand 'x'.TypeError: cannot use 'in' operator to search for 'x' in 'y'.
TypeError: can't redefine non-configurable property "x". TypeError: can't delete non-configurable array element. TypeError: can't define property "x": "obj" is not extensible. TypeError: can't convert BigInt to number. TypeError: can't assign to property "x" on "y": not an object. TypeError: "x" is not a non-null object. Synta圎rror: Using to indicate sourceURL pragmas is deprecated. Synta圎rror: unterminated string literal. Synta圎rror: unparenthesized unary expression can't appear on the left-hand side of '**'. Synta圎rror: unlabeled break must be inside loop or switch. Synta圎rror: Unexpected '#' used outside of class body. Synta圎rror: test for equality (=) mistyped as assignment (=)?. 
Synta圎rror: redeclaration of formal parameter "x".
Synta圎rror: missing = in const declaration. Unicode character class escape: \p after property list. Character class escape: \d, \D, \w, \W, \s, \S. Enumerability and ownership of properties.
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