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1. Install git
2. Install node, which includes npm. This is for compiling and bundling frontend code (not for writing backend code).
   1. Consider installing nvm, which can be used to install specific versions of npm and node as needed.
3. Trust insecure localhost SSL certificates.
4. Run the following commands:

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1. Now go to https://openmrs-spa.org/openmrs/spa/login
2. Open the browser console

3. localStorage.setItem('openmrs:devtools', true)

4. Refresh the page. You will now see a floating colored rectangle on the screen. Click on it. A panel will open up
5. In the Import Map tab, click on the frontend module that you are working on.
6. For all repos except for openmrs-esm-root-config, modify the URL to be 8080. This will make it so the javascript bundle is loaded from https://localhost:8080 instead of the CDN. For esm-root-config, modify it to be the following fully qualified url: https://localhost:8080/openmrs-esm-root-config.defaults.js

7. Refresh the page.
8. Verify that root-config.js is being downloaded from localhost now. You can do this in the Network tab of the browser dev tools.
9. Congrats! You're all set up. Try adding a console.log() statement inside of a file and saving the file. Your web browser will refresh and you should see the console.log inside of the browser console.

Also See

https://github.com/uw-fhir/OpenMRS-FHIR-Webinars/blob/master/Webinar-3-MF-FHIR-Dev-Setup/overview-post.md/

Troubleshooting 

If you run into a issue in Chrome where you are unable to proceed with insecure certificates, try running with a separate certificate as follows:

Generate self-signed certificate:  

openssl req -x509 -newkey rsa:4096 -keyout key.pem -out cert.pem -days 365 -nodes

Use self-signed certificate when starting Node:

npm start -- --https --cert cert.pem --key key.pem

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