code: function nearestBody() {
              const ancestors = context.getAncestors();
              let ancestor = ancestors.pop(),
                  generation = 1;
  
              while (ancestor && ["Program", "FunctionDeclaration",
                  "FunctionExpression", "ArrowFunctionExpression"
              ].indexOf(ancestor.type) < 0) {
                  generation += 1;
                  ancestor = ancestors.pop();
              }
  
              return {
  
                  // Type of containing ancestor
                  type: ancestor.type,
  
                  // Separation between ancestor and node
                  distance: generation
              };
          }
docs: Find the nearest Program or Function ancestor node.
  @returns {Object} Ancestor's type and distance from node.