Error building BitShares-ui due to webpack.config not using Strict mode

[kanguro]

Ok, I got past this issue. Problem was that my Dockerfile was pulling an older version of Nodejs. There is some other issue I am facing, but will use a new post if I can resolve it. Thanks anyhow guys

[kanguro]

Hi,
I am trying to build for production  BitShares UI https://github.com/bitshares/bitshares-ui

My build is failing apparently because the webpack config is not in strict mode and uses "let".
How can I get past this? is there a way to pass in some parameter that would make it run in strict mode?

I mean would be easy to modify the code with a "use strict", but I am trying to avoid modifying the code. This I would think is being built by other people as is.
Has anyone seen this issue? How can I resolve?

Below is the error, thanks 

Step 13/19 : RUN npm run build
 ---> [Warning] Your kernel does not support swap limit capabilities or the cgroup is not mounted. Memory limited without swap.
 ---> Running in 7cfc6910af6a

> BitShares2-light@2.0.180108 build /build
> cross-env NODE_ENV=production webpack --env.prod

/build/webpack.config.js:70
        let outputDir = env.electron ? "electron" : env.hash ? `hash-history_${baseUrl.replace("/", "")}` : "dist";
        ^^^

SyntaxError: Block-scoped declarations (let, const, function, class) not yet supported outside strict mode
    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 Module.require (module.js:354:17)
    at require (internal/module.js:12:17)
    at requireConfig (/build/node_modules/webpack/bin/convert-argv.js:97:18)
    at /build/node_modules/webpack/bin/convert-argv.js:104:17
    at Array.forEach (native)

npm ERR! Linux 4.13.0-26-generic
npm ERR! argv "/usr/bin/nodejs" "/usr/bin/npm" "run" "build"
npm ERR! node v4.2.6
npm ERR! npm  v3.5.2
npm ERR! code ELIFECYCLE
npm ERR! BitShares2-light@2.0.180108 build: `cross-env NODE_ENV=production webpack --env.prod`
npm ERR! Exit status 1
npm ERR!
npm ERR! Failed at the BitShares2-light@2.0.180108 build script 'cross-env NODE_ENV=production webpack --env.prod'.
npm ERR! Make sure you have the latest version of node.js and npm installed.
npm ERR! If you do, this is most likely a problem with the BitShares2-light package,
npm ERR! not with npm itself.
npm ERR! Tell the author that this fails on your system:
npm ERR!     cross-env NODE_ENV=production webpack --env.prod
npm ERR! You can get information on how to open an issue for this project with:
npm ERR!     npm bugs BitShares2-light
npm ERR! Or if that isn't available, you can get their info via:
npm ERR!     npm owner ls BitShares2-light
npm ERR! There is likely additional logging output above.

npm ERR! Please include the following file with any support request:
npm ERR!     /build/web/npm-debug.log
The command '/bin/sh -c npm run build' returned a non-zero code: 1