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Error due to bumping webpack-dev-server from 2.11.3 to 3.1.11 #108

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@kabbagepatch

A PR (#97) was recently merged where we bumped the webpack-dev-server version from 2.11.3 to 3.1.11
This seems to cause some issues.
When running npm run dev
I get the error

The CLI moved into a separate package: webpack-cli
Please install 'webpack-cli' in addition to webpack itself to use the CLI
-> When using npm: npm i -D webpack-cli
-> When using yarn: yarn add -D webpack-cli
module.js:538
    throw err;
    ^

Error: Cannot find module 'webpack-cli/bin/config-yargs'
    at Function.Module._resolveFilename (module.js:536:15)
    at Function.Module._load (module.js:466:25)
    at Module.require (module.js:579:17)
    at require (internal/module.js:11:18)
    at Object.<anonymous> (/Users/km047841/myProjects/WebDev/array-explorer/node_modules/webpack-dev-server/bin/webpack-dev-server.js:84:1)
    at Module._compile (module.js:635:30)
    at Object.Module._extensions..js (module.js:646:10)
    at Module.load (module.js:554:32)
    at tryModuleLoad (module.js:497:12)
    at Function.Module._load (module.js:489:3)

Even after installing webpack-cli, I still get the error

module.js:538
    throw err;
    ^

Error: Cannot find module 'webpack-cli/bin/config-yargs'
    at Function.Module._resolveFilename (module.js:536:15)
    at Function.Module._load (module.js:466:25)
    at Module.require (module.js:579:17)
    at require (internal/module.js:11:18)
    at Object.<anonymous> (/Users/km047841/myProjects/WebDev/array-explorer/node_modules/webpack-dev-server/bin/webpack-dev-server.js:84:1)
    at Module._compile (module.js:635:30)
    at Object.Module._extensions..js (module.js:646:10)
    at Module.load (module.js:554:32)
    at tryModuleLoad (module.js:497:12)
    at Function.Module._load (module.js:489:3)

When I rolled back to webpack-dev-server 2.11.3, the error isn't there anymore. I'm no webpack expert, but I imagine it has to do with some changes needed in the webpack config for the latest webpack-dev-server. Maybe even webpack 4. I'll investigate more. Maybe use this as a way to learn about webpack, but obviously, if someone else/Sarah knows the solution or can figure it out quicker, feel free to fix it :)

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