Webpack bundling changes

[ivansg44]

yarn build:web takes a while, and rebuilding the entire application isn't necessary if users are only editing schemas (as bundling the schemas takes much less time than bundling everything else).

I introduce yarn build:schemas, which only updates the schema content and is pretty quick.

How does this work?:

• menu, getSchema, and getExportFormats are moved to schemas.js
• index.js imports these as import ... from 'schemas'
• We tell webpack.config.js that schemas is an external library
  • i.e., don't bundle schemas.js
• The new webpack.schemas.js file bundles schemas.js instead, and outputs a locally available library
• We import the path to this locally available schemas library inside index.html, which allows the original webpack.config.js build to reference this external schemas library without actually bundling it

Since the functions inside schemas.js are the only JavaScript that actually imports schema stuff (specifically schema.json and export.js files), any edits to schema stuff will not affect the webpack.config.js build. So if a user edits the schema content, they do not have to re-run the lengthy webpack.config.js build. Re-running webpack.schemas.js will suffice.

[ivansg44]

I need to continue testing and make sure I didn't break anything

[ivansg44]

TODO edit README?

[ivansg44]

More explicit: import has to be in HTML

Add ref to webpack docs

[ivansg44]

Does it have to be in the header?

[ivansg44]

getLocale?

[ivansg44]

I think the only change NML folks will need to worry about for their bundling logic is that menu, getSchema, and getExportForms in index.js are now imported from schemas.js. So another javascript file will be included in their bundle. I don't think they need to make any other changes, unless they also want to update their bundling logic to parallel ours (separate builds for application and schema content), but they don't have to do that.

[ddooley]

Looks great, I'm merging into master! And then Ken can merge into DH2-i18n-rc1 on his schedule. The Wastewater update will also have to be merged into master and into DH2-i18n-rc1, but I can do this as soon as Charlie ok's it.