Vue.js devserver proxy как добавить сертификат?

https: true,
    https: {
      key: fs.readFileSync('C:/Users/Developer/localhost-key.pem'),
      cert: fs.readFileSync('C:/Users/Developer/localhost.pem'),
      ca: fs.readFileSync('C:/Users/Developer/AppData/Local/mkcert/rootCA.pem')
    },

C:\projects\findclone\build\webpack.dev.conf.js:27
      key: fs.readFileSync('C:/Users/Developer/localhost-key.pem'),
           ^

ReferenceError: fs is not defined
    at Object.<anonymous> (C:\projects\findclone\build\webpack.dev.conf.js:27:12)
    at Module._compile (internal/modules/cjs/loader.js:701:30)
    at Object.Module._extensions..js (internal/modules/cjs/loader.js:712:10)
    at Module.load (internal/modules/cjs/loader.js:600:32)
    at tryModuleLoad (internal/modules/cjs/loader.js:539:12)
    at Function.Module._load (internal/modules/cjs/loader.js:531:3)
    at Module.require (internal/modules/cjs/loader.js:637:17)
    at require (internal/modules/cjs/helpers.js:22:18)
    at requireConfig (C:\projects\findclone\node_modules\webpack\bin\convert-argv.js:97:18)
    at C:\projects\findclone\node_modules\webpack\bin\convert-argv.js:104:17
    at Array.forEach (<anonymous>)
    at module.exports (C:\projects\findclone\node_modules\webpack\bin\convert-argv.js:102:15)
    at Object.<anonymous> (C:\projects\findclone\node_modules\webpack-dev-server\bin\webpack-dev-server.js:223:50)
    at Module._compile (internal/modules/cjs/loader.js:701:30)
    at Object.Module._extensions..js (internal/modules/cjs/loader.js:712:10)
    at Module.load (internal/modules/cjs/loader.js:600:32)
npm ERR! code ELIFECYCLE
npm ERR! errno 1
npm ERR! findclone@1.0.0 dev: `webpack-dev-server --inline --progress --config build/webpack.dev.conf.js`
npm ERR! Exit status 1
npm ERR! 
npm ERR! Failed at the findclone@1.0.0 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!     C:\Users\Developer\AppData\Roaming\npm-cache\_logs\2019-03-18T12_08_54_940Z-debug.log

Process finished with exit code 1