TypeError: Cannot read property 'properties' of undefined

[nicolaskruchten]

Walking through the README from top to bottom, I hit an error with npm run build:js-dev:

> my-dash-component@0.0.1 build:js-dev /Users/nicolas/plotly/dash-component-boilerplate
> webpack --mode development

/Users/nicolas/plotly/dash-component-boilerplate/node_modules/webpack-cli/bin/config-yargs.js:89
                                describe: optionsSchema.definitions.output.properties.path.description,
                                                                           ^

TypeError: Cannot read property 'properties' of undefined
    at module.exports (/Users/nicolas/plotly/dash-component-boilerplate/node_modules/webpack-cli/bin/config-yargs.js:89:48)
    at /Users/nicolas/plotly/dash-component-boilerplate/node_modules/webpack-cli/bin/webpack.js:60:27
    at Object.<anonymous> (/Users/nicolas/plotly/dash-component-boilerplate/node_modules/webpack-cli/bin/webpack.js:515:3)
    at Module._compile (module.js:652:30)
    at Object.Module._extensions..js (module.js:663:10)
    at Module.load (module.js:565:32)
    at tryModuleLoad (module.js:505:12)
    at Function.Module._load (module.js:497:3)
    at Module.require (module.js:596:17)
    at require (internal/module.js:11:18)
npm ERR! code ELIFECYCLE
npm ERR! errno 1
npm ERR! my-dash-component@0.0.1 build:js-dev: `webpack --mode development`
npm ERR! Exit status 1
npm ERR!
npm ERR! Failed at the my-dash-component@0.0.1 build:js-dev 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!     /Users/nicolas/.npm/_logs/2018-09-26T19_27_29_669Z-debug.log

[fskpf]

This was broken by a webpack update, see webpack/webpack#8082

A workaround for now is to update both, webpack and webpack-cli in package.json:

    "webpack": "^4.20.2",
    "webpack-cli": "^3.1.1",

[nicolaskruchten]

That fixed it for me, thanks! @T4rk1n you want a PR?

[T4rk1n]

@nicolaskruchten I got my cookiecutter PR coming up, I already changed the versions there.

[thomasoss]

That fixed it to me, too. ;-). I got the problem after installing nano.
After altering the version of webpack in package.json and
npm install --save webpack-cli
the problem was fixed
Thank's