Install

Start by installing Google Clasp

Once installed, either clasp clone your Google Sheets Apps Script file, or clasp create a new standalone Apps Script project. This will generate .clasp.json and appsscript.json files into the root of this project.

In your .clasp.json file, change "rootDir" to "dist/prod".

Finally, run npm install.

Scripts

launch:local

• Runs the current dev build

launch:prod

• Uses clasp to launch the webapp picker and open the selected version in the browser

build:local

• Builds a dev version in dist/local

build:prod

• Builds a prod version in dist/prod

build:gas

• Packages your Apps Script files into the AppLib library module (from lib.bundle.js) so you can utilize your npm packages server-side as well. Builds in dist/prod.

redeploy

• Allows you to redeploy to the same version ID. Useful for keeping a static URL.

deploy:gas

• Pushes the latest dist/prod via clasp to your Apps Script project

deploy:prod

• Bundles client into app.bundle.js and server into lib.bundle.js
• Inlines app.bundle.js into index.html
• Pushes your code to Apps Script
• Deploys a new version
• Launches the Webapp selector

Extras

I've included the basic setup for Material-UI 6 and React Router 6.