code: function check(node) {
              const body = nearestBody(),
                  valid = ((body.type === "Program" && body.distance === 1) ||
                      body.distance === 2);
  
              if (!valid) {
                  context.report({
                      node,
                      message: "Move {{type}} declaration to {{body}} root.",
                      data: {
                          type: (node.type === "FunctionDeclaration" ? "function" : "variable"),
                          body: (body.type === "Program" ? "program" : "function body")
                      }
                  });
              }
          }
docs: Ensure that a given node is at a program or function body's root.
  @param {ASTNode} node Declaration node to check.
  @returns {void}