SyntaxError: expected expression, got "x" SyntaxError: expected property name, got "x" SyntaxError: expected target, got "x" SyntaxError: expected rest argument name, got "x" SyntaxError: expected closing parenthesis, got "x" SyntaxError: expected '=>' after argument list, got "x"
A specific language construct was expected, but something else was provided. This might be a simple typo.
For example, when calling functions, trailing commas are not allowed. JavaScript will expect another argument, which can in fact be any expression.
Math.max(2, 42,); // SyntaxError: expected expression, got ')'
Correct would be omitting the comma or adding another argument:
Math.max(2, 42); Math.max(2, 42, 13 + 37);
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https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Errors/Unexpected_token