Update: A different way to imagine the problem Here Tab = connect( mapState, mapDispatch )( Tabs ) is an AssignmentExpression. Tab becomes an AssignmentExpression as it's given the name default ?Įxport default Tab = connect( mapState, mapDispatch )( Tabs ) is fine The following is fine export default Tab If you want to const something you need to provide the identifier and not use default.Įxport by itself accepts a VariableStatement or Declaration to its right. You are trying to mix this with the default keyword, which expects a HoistableDeclaration, ClassDeclaration or AssignmentExpression to follow it. For each instance field (public or private), its initializer expression is saved.Const is like let, it is a LexicalDeclaration ( VariableStatement, Declaration) used to define an identifier in your block.The class elements' values are evaluated in the order of declaration:.For all steps above, if an evaluated expression tries to access the name of the class, a ReferenceError is thrown because the class is not initialized yet. The class is now initialized with the prototype specified by extends and implementation specified by constructor.Private instance methods and accessors are saved to be installed on the instance directly later. Instance methods and accessors are installed on the prototype property of the current class, and static methods and accessors are installed on the class itself. Methods and accessors are installed in the order of declaration.None of the property values are evaluated yet. If the property key is computed, the computed expression is evaluated, with the this value set to the this value surrounding the class (not the class itself). The class elements' property keys are evaluated in the order of declaration.However, because the constructor definition is only a method definition, this step is not observable. The constructor method is extracted, substituted with a default implementation if constructor is not present.It must evaluate to a valid constructor function or null, or a TypeError is thrown. The extends clause, if present, is first evaluated.When a class declaration or class expression is evaluated, its various components are evaluated in the following order: 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.
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