function isExportStatement( node ) {
	if (
		node.left.type === 'MemberExpression'
	) {
		if (
			node.left.object.name === 'module' &&
			node.left.property.name === 'exports'
		) {
			return true;
		}
		if ( node.left.object.name === 'exports' ) {
			return true;
		}
	}
	return false;
}
Checks whether a node represents an assignment to `module.exports`.

@private
@param {ASTNode} node - node to examine
@returns {boolean} boolean indicating whether node represents a `module.exports` assignment