Unexpected Token during npm run build

[mraswinc]

`/home/stradmin/lottery-demo-app/node_modules/react-scripts/scripts/build.js:64
({ stats, previousFileSizes, warnings }) => {
^

SyntaxError: Unexpected token {
at exports.runInThisContext (vm.js:53:16)
at Module._compile (module.js:374:25)
at Object.Module._extensions..js (module.js:417:10)
at Module.load (module.js:344:32)
at Function.Module._load (module.js:301:12)
at Function.Module.runMain (module.js:442:10)
at startup (node.js:136:18)
at node.js:966:3`