Bump Node version, add ESLint 🧹

[kanadgupta]

What

Adds minimal ESLint config and fixes some glaring issues in our core JS files. Also does a minor bump of our Node version to ensure we're on the most secure version.

Why

This is very light touch (i.e. no style changes, etc.) but this will help eliminate bugs and dead code.

Ensure the following interactions work as expected. Please test using a mobile form factor.

• [ ] Tapping on a marker on the map displays information about the marker in a popup.
• [ ] Tapping the "Show list of locations" button replaces the map view with a list view.
• [ ] Tapping an item in the list replaces the list view with a map view, and navigates the map to the tapped item on the map.
• [ ] Tapping one of the ✅'s in the legend filters items on the map and in the list.
• [ ] Changing the language to spanish changes things on the page.
• [ ] Clicking the Help/Info button opens and closes a menu with information.
• [ ] Clicking the X Close button on the Help/Info screen closes the modal.

Check the app in the following web browsers:

• [ ] Chrome
• [ ] Firefox
• [ ] Edge
• [ ] Safari

[kanadgupta]

@amaxama any idea what Travis CI does? Is it just for running tests? Any way we could also have it do an ESLint check as well? I couldn't find anything about it in the config 🤔

[kanadgupta]

I could also set up a GitHub CI (which should be free) to run the lint check?

[amaxama]

@amaxama any idea what Travis CI does? Is it just for running tests? Any way we could also have it do an ESLint check as well? I couldn't find anything about it in the config 🤔

Yeah, it's for running tests...I would thing it would be pretty easy to add a pipeline step to run and eslint check, but haven't looked into it! 🤔 I think you could just add a script block in the travis.yml with the command

[amaxama]

I could also set up a GitHub CI (which should be free) to run the lint check?

Seems like we should use one or the other? I'm not opposed to switching but probably don't need two CI pipelines? What do you think?