@bahmutov/cypress-extends 
Cypress plugin that adds "extends" support to the configuration file. This allows the config files to remain DRY and avoid duplicating data, but still have multiple files for different scenarios. See details in Extending the Cypress Config File blog post.
Use
npm i -D @bahmutov/cypress-extends
# or
yarn add -D @bahmutov/cypress-extends
Add this module to your cypress/plugins/index.js file
module.exports = (on, config) => {
// `on` is used to hook into various events Cypress emits
// `config` is the resolved Cypress config
return require('@bahmutov/cypress-extends')(config.configFile)
}
Start using extends syntax in your Cypress configuration file
// cypress.json
{
"extends": "./base.json"
}
// base.json
{
"fixturesFolder": false,
"supportFile": false,
"$schema": "https://on.cypress.io/cypress.schema.json"
}
Tip: the $schema property in JSON files lets modern IDE show intelligent code completion for Cypress config values.
Debugging
Run Cypress with environment variable
DEBUG=@bahmutov/cypress-extends npx cypress run
# or
DEBUG=@bahmutov/cypress-extends npx cypress open
More info
Read Cypress tips and tricks and watch Cypress tips videos.
Small print
Author: Gleb Bahmutov <[email protected]> © 2020
License: MIT - do anything with the code, but don't blame me if it does not work.
Support: if you find any problems with this module, email / tweet / open issue on Github
MIT License
Copyright (c) 2020 Gleb Bahmutov <[email protected]>
Permission is hereby granted, free of charge, to any person obtaining a copy of this software and associated documentation files (the "Software"), to deal in the Software without restriction, including without limitation the rights to use, copy, modify, merge, publish, distribute, sublicense, and/or sell copies of the Software, and to permit persons to whom the Software is furnished to do so, subject to the following conditions:
The above copyright notice and this permission notice shall be included in all copies or substantial portions of the Software.
THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.