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Add support for component size limits #690

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@JordanForeman

Description

Is your feature request related to a problem? Please describe.

I want to define a perf budget in the form of a maximum component size. ds size allows me to set thresholds for changesets, but not for a component totally.

Describe the solution you'd like

The ds size command presently only considers the diff in size between the current changeset and the current release. I believe that with some minimal changes, we should be able to support a size limit for components.

It would be ideal to be able to specify a size limit on a component-by-component basis. I'm super new to this codebase, but it seems like ds.config is system-wide. If it's possible to make component-specific configurations, then exposing a size.limit configuration for a given component that is enforced by ds size would be great. Barring that, setting a size.limit for all components should be feasible as well.

Describe alternatives you've considered

  • ds size will can result in a report being added to Pull Requests via comments. It's possible to enforce a size limit by refusing to approve PRs where a limit is surpassed. ie. team norms
  • Possible to author instrumentation that parses output of ds size and fails if a limit is surpassed

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