enter(node) {
        visitors.enter(node)

        if (
          node.type === 'ArrowFunctionExpression' ||
          node.type === 'FunctionDeclaration' ||
          node.type === 'FunctionExpression'
        ) {
          this.skip()
          visitors.exit(node) // Call the exit handler manually.
        }
      }
@param {Program} tree
  Tree.
@param {VFile} file
  File.
@returns {undefined}
  Nothing.