Obscure webpack error on travis

[CharlotteFawsitt]

Investigate the below output that is being printed out when running tests

> [email protected] cleanup /tmp/cf266c642bf5f0b4979fbe27e7fce31bdb3f9cf8
> rimraf target/classes/static/ target/classes/aot
> [email protected] webpack:build:main /tmp/cf266c642bf5f0b4979fbe27e7fce31bdb3f9cf8
> npm run webpack -- --config webpack/webpack.dev.js --env.stats=minimal
> [email protected] webpack /tmp/cf266c642bf5f0b4979fbe27e7fce31bdb3f9cf8
> node --max_old_space_size=4096 node_modules/webpack/bin/webpack.js "--config" "webpack/webpack.dev.js" "--env.stats=minimal"
internal/modules/cjs/loader.js:638
    throw err;
    ^
Error: Cannot find module '/tmp/cf266c642bf5f0b4979fbe27e7fce31bdb3f9cf8/node_modules/webpack/bin/webpack.js'
    at Function.Module._resolveFilename (internal/modules/cjs/loader.js:636:15)
    at Function.Module._load (internal/modules/cjs/loader.js:562:25)
    at Function.Module.runMain (internal/modules/cjs/loader.js:829:12)
    at startup (internal/bootstrap/node.js:283:19)
    at bootstrapNodeJSCore (internal/bootstrap/node.js:622:3)
npm ERR! code ELIFECYCLE
npm ERR! errno 1
npm ERR! [email protected] webpack: `node --max_old_space_size=4096 node_modules/webpack/bin/webpack.js "--config" "webpack/webpack.dev.js" "--env.stats=minimal"`
npm ERR! Exit status 1
npm ERR! 
npm ERR! Failed at the [email protected] webpack script.
npm ERR! This is probably not a problem with npm. There is likely additional logging output above.
npm WARN Local package.json exists, but node_modules missing, did you mean to install?
npm ERR! A complete log of this run can be found in:
npm ERR!     /home/travis/.npm/_logs/2019-11-11T09_48_52_951Z-debug.log
npm ERR! code ELIFECYCLE
npm ERR! errno 1
npm ERR! [email protected] webpack:build:main: `npm run webpack -- --config webpack/webpack.dev.js --env.stats=minimal`
npm ERR! Exit status 1
npm ERR! 
npm ERR! Failed at the [email protected] webpack:build:main script.
npm ERR! This is probably not a problem with npm. There is likely additional logging output above.
npm WARN Local package.json exists, but node_modules missing, did you mean to install?
npm ERR! A complete log of this run can be found in:
npm ERR!     /home/travis/.npm/_logs/2019-11-11T09_48_52_968Z-debug.log
npm ERR! code ELIFECYCLE
npm ERR! errno 1
npm ERR! [email protected] webpack:build: `npm run cleanup && npm run webpack:build:main`
npm ERR! Exit status 1
npm ERR! 
npm ERR! Failed at the [email protected] webpack:build script.
npm ERR! This is probably not a problem with npm. There is likely additional logging output above.
npm WARN Local package.json exists, but node_modules missing, did you mean to install?
npm ERR! A complete log of this run can be found in:
npm ERR!     /home/travis/.npm/_logs/2019-11-11T09_48_52_981Z-debug.log