Development- and production-specific builds

[thompsongl]

trafficstars

#4548 started the discussion (resounding positive reaction) and #5527 began the exploration, but we want to generate proper builds for development and production environments.

Considerations:

• kbn-ui-shared-deps
  • Uses the production version (based on process.env) without exception
  • What helpful development features would be lost?
  • Work with Kibana ops to loosen the restrictions
• Console
  • Deprecation warnings
• propTypes
  • Removable for prod
  • #4101 points toward improvement for dev
• babel/runtime
  • Introduces a new [peer]Dep for consumers
  • Require for dev, also?

[markov00]

hey @thompsongl are you also considering targeting the transpilation to ES2020 or ES2021 only code? It looks like that all our supported browsers are supported https://kangax.github.io/compat-table/es2016plus/ This will definitely reduce the bundle size, removing polyfills for spread operators etc WDYT?

[thompsongl]

are you also considering targeting the transpilation to ES2020 or ES2021 only code?

Yes, we'll evaluate browser support, etc. when making changes 👍

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