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npm run build fails

See original GitHub issue

Q	A
Bug or feature request?	Bug
Which Swagger/OpenAPI version?	3.0.0
Which Swagger-UI version?	3.3.1
How did you install Swagger-UI?	git clone & git checkout
Which browser & version?
Which operating system?	debian testing on x64

I cloned this repo, checked out tag 3.3.1 and ran npm run build. This is what I got:

> swagger-ui@3.3.1 build /home/user/swagger-ui
> npm run build-core && npm run build-bundle && npm run build-standalone


> swagger-ui@3.3.1 build-core /home/user/swagger-ui
> webpack --config webpack-dist.config.js --colors

/home/user/swagger-ui/webpack-dist.config.js:6
let rules = [
^^^

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:373:25)
    at Object.Module._extensions..js (module.js:416:10)
    at Module.load (module.js:343:32)
    at Function.Module._load (module.js:300:12)
    at Module.require (module.js:353:17)
    at require (internal/module.js:12:17)
    at requireConfig (/home/user/swagger-ui/node_modules/webpack/bin/convert-argv.js:96:18)
    at /home/user/swagger-ui/node_modules/webpack/bin/convert-argv.js:109:17
    at Array.forEach (native)
npm ERR! code ELIFECYCLE
npm ERR! errno 1
npm ERR! swagger-ui@3.3.1 build-core: `webpack --config webpack-dist.config.js --colors`
npm ERR! Exit status 1
npm ERR!
npm ERR! Failed at the swagger-ui@3.3.1 build-core script.
npm ERR! This is probably not a problem with npm. There is likely additional logging output above.

npm ERR! A complete log of this run can be found in:
npm ERR!     /home/user/.npm/_logs/2017-10-06T20_42_28_836Z-debug.log
npm ERR! code ELIFECYCLE
npm ERR! errno 1
npm ERR! swagger-ui@3.3.1 build: `npm run build-core && npm run build-bundle && npm run build-standalone`
npm ERR! Exit status 1
npm ERR!
npm ERR! Failed at the swagger-ui@3.3.1 build script.
npm ERR! This is probably not a problem with npm. There is likely additional logging output above.

npm ERR! A complete log of this run can be found in:
npm ERR!     /home/user/.npm/_logs/2017-10-06T20_42_28_859Z-debug.log

2017-10-06T20_42_28_859Z-debug.log