code: function toFunctionExpression(node) {
              const params = node.params
              const paramText = params.length
                  ? sourceCode.text.slice(
                        params[0].range[0],
                        params[params.length - 1].range[1]
                    )
                  : ""
  
              const arrowToken = sourceCode.getTokenBefore(
                  node.body,
                  isArrowToken
              )
              const preText = sourceCode.text.slice(
                  arrowToken.range[1],
                  node.body.range[0]
              )
              const bodyText = sourceCode.text.slice(
                  arrowToken.range[1],
                  node.range[1]
              )
  
              if (node.body.type === "BlockStatement") {
                  return `function(${paramText})${bodyText}`
              }
              if (preText.includes("\n")) {
                  return `function(${paramText}){return(${bodyText})}`
              }
              return `function(${paramText}){return ${bodyText}}`
          }
docs: ArrowFunctionExpression to FunctionExpression
  @param  {Node} node ArrowFunctionExpression Node
  @returns {string} function expression text