rigor-activesupport-core-ext

An opt-in RBS bundle for the ActiveSupport core_ext extensions that real Rails code uses most — Time.current, 3.days, Array.wrap, "x".squish, obj.blank?, and the rest. It ships no analyzer and no diagnostics: its whole job is to hand Rigor signatures for these methods so they stop showing up as call.undefined-method false positives. A four-project Rails survey found 64–90% of every project’s diagnostics came from ActiveSupport extensions missing from stdlib RBS — making this the single largest false-positive suppressor for Rails apps, and the one to reach for first when Rigor floods a Rails codebase with undefined-method noise.

It ships bundled in rigortype. Activate it under plugins::

plugins:
  - rigor-activesupport-core-ext

That is the whole setup — Rigor resolves the bundled sig/ automatically (ADR-25); no path, no vendoring, no signature_paths: wiring.

What it covers

Roughly the top ~40 selectors plus their close neighbours, across:

• Object (universal) — #blank?, #present?, #presence, #try, #try!, #acts_like? (+ NilClass / TrueClass / FalseClass).
• Integer / Float — Duration multipliers (#days, #hours, #minutes, …) and Bytes multipliers (#megabytes, #gigabytes, …).
• String — inflections (#underscore, #camelize, #classify, #constantize, #pluralize, …), filters (#squish, #truncate), #html_safe, #starts_with? / #ends_with?, conversions.
• Time / Date / DateTime — .current, .zone, #yesterday, #tomorrow, #beginning_of_* / #end_of_*, #ago, #since.
• Array — .wrap, #to_sentence, #in_groups_of, #second … #fifth, #compact_blank, #exclude?.
• Hash — #symbolize_keys / #stringify_keys (+ deep / bang), #deep_merge, #with_indifferent_access, #except!.
• Enumerable — #index_by, #index_with, #pluck, #exclude?.

3.days           # without the bundle: call.undefined-method Integer#days
"  x  ".squish   # without the bundle: call.undefined-method String#squish
Time.current     # without the bundle: call.undefined-method Time.current

No diagnostics, no config

The plugin is RBS-only — it emits no diagnostics and has no configuration knobs. It contributes its signatures unconditionally when listed under plugins:.

Limitations

• Conservative return types. Integer#days really returns ActiveSupport::Duration, but the bundle types it untyped because the analysis environment usually lacks the Duration class — the goal is to silence undefined-method, not to give precise returns. Likewise #html_safe is typed String (not SafeBuffer) and #try / #try! return untyped.
• Project-private monkey-patches are not covered — only real ActiveSupport extensions. For your own core-class patches see the pre_eval: mechanism (ADR-17).
• Top ~40 selectors, not exhaustive. ActiveSupport ships hundreds of extensions; this covers the head of the real-world distribution.

Plugin internals

The RBS layout, the per-class coverage, and the survey that picked the selectors are in the plugin’s README. To write a plugin, see examples/ and the rigor-plugin-author skill.