ES6 导出默认的AssignmentExpression

Question

export default var foo = {...}

It's AssignmentExpression and valid es6 syntax? JSHint says it Expected an identifier and instead saw 'var'.

On last spec I not found any relation with VariableStatement and AssignmentExpression.

Answer 1

var foo = {...}

is not an AssignmentExpression . AssignmentExpression is almost the top level non-terminal symbol that represents all expression , ie basically every expression is an AssignmentExpression .

var only appears in a variable declaration or a for loop, so drop the var .