function isFunctionBody(node) {
	const parent = node.parent;

	return (
		node.type === "BlockStatement" &&
		astUtils.isFunction(parent) &&
		parent.body === node
	);
}
Checks whether the given node represents the body of a function.
@param {ASTNode} node the node to check.
@returns {boolean} `true` if the node is function body.