@quasar/app-webpack/lib/modes/modes-utils.js

Quasar Framework App CLI with Webpack

const fse = require('fs-extra')

/**
 * @param {import('../../types/app-paths').QuasarAppPaths} appPaths
 * @param {import('../../types/configuration/context').QuasarMode} modeName
 * @returns {boolean}
 */
module.exports.isModeInstalled = function isModeInstalled(appPaths, modeName) {
  return (
    modeName === 'spa' || // always installed
    fse.existsSync(appPaths[`${modeName}Dir`])
  )
}