function looksLikeExport(astNode) {
	return (
		astNode.type === "ExportDefaultDeclaration" ||
		astNode.type === "ExportNamedDeclaration" ||
		astNode.type === "ExportAllDeclaration" ||
		astNode.type === "ExportSpecifier"
	);
}
Check to see if its a ES6 export declaration.
@param {ASTNode} astNode An AST node.
@returns {boolean} whether the given node represents an export declaration.
@private