DEV environment is not properly set

[3n9]

Expected Behavior

1. To have process.env.NODE_ENV set to development.
2. To have dev variable set in webextension-toolbox-config.js

Current Behavior

1. process.env.NODE_ENV is always set to production
2. dev variable in webextension-toolbox-config.js is always undefined

Steps to Reproduce (for bugs)

1. clone https://github.com/webextension-toolbox/js-extension-template
2. run npm install
3. add console.log(process.env.NODE_ENV); to the bottom of app/background.js
4. create webextension-toolbox-config.js with the following contents:

module.exports = {
  webpack: (config, { dev, vendor }) => {
    // Perform customizations to webpack config
    console.log("dev: ", dev);

    // Important: return the modified config
    return config;
  },
};

6. update package.json run script webextension-toolbox dev --config webextension-toolbox.config.js

Context

1. When running npm run dev chrome script provides following output:

Using Babel loader to compile
dev:  undefined

2. After dev build step, last lines of dist/chrome/background.js looks like this:

console.log("production");
}();
/******/ })()
;

[stale]

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