all_observer_lint 0.6.1

Official lint rules and automated fixes for safe, predictable, and efficient development with all_observer.

Changelog

0.6.1

Bug fix: Introduce ReactiveScope could rewrite an inferred (never explicitly annotated) effect()-backed Disposer field using Disposer as its new explicit type. That alias is not exported from the real all_observer package's public surface, so the generated field failed to resolve (undefined_class) against real code, even though it compiled fine against this package's own test fixture. The assist now uses the underlying structural type (void Function()) instead whenever no explicit type was already present. See documentation/architecture.md/ backlog.md for the full root cause. No other rule/assist/preset changed.

0.6.0

Wrap with Observer is now permissive (any Widget selection, not just reads); read-quality judgment stays with the opt-in lints. Performance: per-execution type-hierarchy memoization, plus one-time indices for unused_reactive_state/dispose_reactive_resources. New rule: copied_reactive_collection_outside_tracking (strict/all, info); the two write-purity rules now also catch reactive-collection mutations. Five new assists — wrap smallest reactive subtree, extract to Computed, convert ValueNotifier/ChangeNotifier field to Observable, introduce ReactiveScope — all assist-only, no preset change; AsyncState deferred. Two regressions found and fixed along the way: a compound-assignment tracking gap and a missed FunctionExpressionInvocation-shaped disposal call. See documentation/architecture.md/backlog.md for full details.

0.5.1

Stabilization patch, addressing the P0/P1 findings from the pre-publication review of 0.5.0 (see documentation/backlog.md):

• Wrap with Observer no longer assumes a bare Observer(...) reference is safe just because an all_observer import exists or can be added. The assist now checks for a same-named top-level declaration in the file, a locally-shadowing parameter/variable at the selection point, and any other unprefixed import that might also expose an Observer name, falling back to a freshly generated, uniquely-named prefixed import (e.g. allObserver.Observer, allObserver2.Observer) whenever any of those are detected. This means the assist is now available (via a safe prefixed import) in some cases where it previously stayed unavailable.
• dispose_reactive_resources and its quick fix now also recognize effect(...) stored without an explicit Disposer annotation (late final disposeEffect = effect(() {});) and, when the initializer is proven to be effect(...) but the declared type is a non-Disposer structural function type, only apply the callback-invocation fix when that type is actually invocable with no required arguments — a field typed as Object (or anything else non-invocable) is left unresolved rather than risking an invalid field(); fix.
• observer_without_reactive_read, computed_without_reactive_read, and effect_without_reactive_read are now more conservative about proving a tracking scope has no reactive read at all: a helper call reached through this/an instance target/a static target (previously only bare calls were treated this way), and a nested closure (e.g. inside .map), are now both treated as a potential hidden read and suppress the diagnostic, instead of being silently ignored. Calls resolved to dart:core/other SDK libraries (e.g. toString()) are explicitly excluded from this so proven-empty scopes are still flagged.
• The fake_all_observer test fixture (used only by this package's own test suite, never shipped) was updated to match the real all_observer public surface more closely: debounce/interval now require the named time: parameter (previously optional with a default), ObservableList<E> now extends ListBase<E> instead of wrapping a CoreObservable<List<E>> (matching how the real package models it, which affects static-type-based member resolution, iteration, and collection literals), and ObservableMap/ObservableSet fakes and .obs extensions were added.
• observer_without_reactive_read/computed_without_reactive_read no longer under-report on a tracking scope that only iterates or queries a reactive collection: ReactiveReadCollector now also recognizes map/where/whereType/expand/fold/reduce/every/any/ contains/containsKey/containsValue/indexOf/lastIndexOf/ indexWhere/lastIndexWhere/join/take/takeWhile/skip/ skipWhile/followedBy/toList/toSet/asMap/getRange/sublist/ firstWhere/lastWhere/singleWhere/elementAt/forEach calls, plain for-in iteration, and collection-literal spreads (...items), on ObservableList/ObservableMap/ObservableSet as reads — matching how the real collections actually register dependencies at runtime (through their own length/[]).
• Added test/fixtures/real_runtime_smoke, a fixture pinned to the real, published all_observer package (>=1.5.6 <1.6.0) rather than this repo's fake_all_observer stand-in, wired into a new CI job. It analyzes and lints a file exercising Observable, Computed, effect, all four workers, ObservableSubscription, ObservableHistory, ReactiveScope, ObservableFuture/ObservableStream, Observer/Observer.withChild, watch(context), and the reactive collections against the real package, then applies the dispose_reactive_resources quick fix to a file using the inferred-Disposer form and re-analyzes/re-lints to prove the diagnostic disappears and no invalid .dispose() call was generated — the first proof this package's rules and fixes behave correctly against the actual published all_observer API (every signature the fixture relies on, e.g. debounce/interval's required time:, was read directly from the package source at the pinned version).
• CI now also checks dart format on lib/, and both smoke jobs (fake-runtime and real-runtime) re-run dart format + dart analyze + custom_lint after applying the dispose_reactive_resources fix, failing if the diagnostic is still reported — previously only each Dart test's own golden comparison verified a fix's output, with no equivalent end-to-end check in CI.
• Added dedicated observer_without_reactive_read coverage proving Observer.withChild is tracked correctly: only its builder callback is inspected, never the child argument — a reactive read that appears only in child still counts as the builder having zero reactive reads, since child is built once and is never responsible for a rebuild.
• dispose_reactive_resources now follows disposal delegated to a same-class, zero-parameter helper method (_disposeResources(), this._disposeResources()), directly or chained through further such helpers, instead of only ever looking for the disposal call written directly in dispose(). Deliberately narrow: a helper that takes a parameter, lives outside the class, or is reached only through a tear-off is not followed, so the field is still flagged in those cases.
• Added test/runtime_contract/fake_runtime_contract_test.dart: a network-free check that fake_all_observer still declares the exact signatures verified against the real package for this release (debounce/interval's required time:, the collections' dart:collection base classes, Disposer/effect(), Observer/ Observer.withChild, assign/assignAll), so an accidental future revert of the fake's shape is caught immediately instead of only at the next manual audit.

0.5.0

• Fixed dispose_reactive_resources and its quick fix to use resolved disposal contracts: callback invocation, dispose(), close(), or cancel().
• Added the Wrap with Observer assist with semantic Widget/read checks, callback/tracking/const guards, and safe import handling.
• Added recommended warnings invalid_history_limit and async_inside_batch.
• Added strict/all info diagnostics observer_without_reactive_read, computed_without_reactive_read, and effect_without_reactive_read.
• Added full-file golden transformation tests, post-edit formatting and reanalysis, idempotency checks, and a real custom_lint runner smoke project.

0.4.0

Breaking configuration change:

• Presets and localization now use custom_lint.rules, the configuration shape exposed by custom_lint. Projects that configured Portuguese messages with a top-level all_observer: key must move that option under custom_lint.rules:

  custom_lint:
    rules:
      - all_observer:
        language: pt-BR
  

Fixes and improvements:

• Fixed Brazilian Portuguese diagnostic opt-in documentation and tests.
• recommended.yaml, strict.yaml, and all.yaml now explicitly disable unspecified lint rules so each preset enables only its intended rules.
• Added a quick fix for prefer_batch_for_multiple_related_writes that wraps consecutive reactive writes in Observable.batch(() { ... });.
• Fixed prefer_batch_for_multiple_related_writes so it no longer reports writes that are already inside Observable.batch.
• Added the strict/all unused_reactive_state rule for private reactive fields and top-level variables that are never referenced in the same file.
• Added the strict/all unobserved_reactive_read_in_build rule for reactive .value reads rendered in build without Observer or watch(context).

0.3.0

Documentation-only update. No changes to rule behavior, presets, or the public API.

• Synced README.md/README.pt-BR.md install snippets and compatibility notes with the 0.2.0 toolchain bump (Dart SDK >=3.10.0, analyzer 8.x, custom_lint_builder 0.8.1), including the custom_lint/ all_observer_lint version pins shown in the install examples.

0.2.0

Compatibility release for the current Dart/custom_lint toolchain.

• Raised the minimum Dart SDK to >=3.10.0 <4.0.0.
• Updated lint tooling constraints for custom_lint_builder 0.8.x and analyzer 8.x.
• Migrated internal analyzer API usage to the current element model.
• No rule behavior changes.

0.1.0

First public release of all_observer_lint.

This version introduces the official lint package for teams building with all_observer. It focuses on the mistakes that are hardest to notice during day-to-day development: reactive resources created in rebuild paths, effects registered repeatedly, impure Computed callbacks, unsafe writes while UI is building, invalid watch(context) usage, and missing disposal for long-lived reactive resources.

The goal of this first release is simple: help developers catch real reactive bugs earlier, directly in the IDE, without adding anything to the application runtime.

Highlights

• Official custom_lint plugin for all_observer.

• Ready-to-use presets:

  • recommended.yaml for everyday projects.
  • strict.yaml for additional design guidance.
  • all.yaml for evaluating every available rule.

• Diagnostics in English by default.

• Brazilian Portuguese diagnostics with:

  custom_lint:
    rules:
      - all_observer:
        language: pt-BR
  

• Quick fix support for missing disposal of reactive resources.

• Error-level protection for direct self-referencing Computed values.

• Example Flutter app with flagged and fixed patterns.

• Bilingual rule documentation.

Rules Included

Recommended rules:

• avoid_reactive_creation_in_build
• avoid_effect_creation_in_build
• watch_only_inside_build
• dispose_reactive_resources
• avoid_reactive_write_in_computed
• avoid_set_state_in_computed
• avoid_worker_creation_in_computed
• avoid_io_in_computed
• avoid_observable_write_during_observer_build
• self_referencing_computed

Strict rules:

• prefer_computed_for_derived_state
• prefer_batch_for_multiple_related_writes
• prefer_assign_all_for_reactive_list_replace

Why It Matters

all_observer tracks dependencies automatically when reactive values are read inside tracked contexts such as Observer, Computed, effect, and watch(context). Small mistakes around where resources are created, where state is mutated, or when subscriptions are disposed can lead to duplicated listeners, repeated side effects, lost state, stale observers, or unpredictable UI updates.

The strict preset also includes a targeted ObservableList replacement rule: when code calls clear() and immediately follows with add or addAll, the lint suggests assign or assignAll so replacement happens as one logical operation.

all_observer_lint turns those patterns into actionable feedback while the developer is still writing the code.

Documentation

• README: installation, setup, examples, presets, and rule list.
• README.pt-BR.md: Portuguese version.
• documentation/en/rules/: English rule documentation.
• documentation/pt-BR/rules/: Portuguese rule documentation.
• documentation/architecture.md: implementation notes and semantic matching.
• documentation/backlog.md: known limitations and future rule candidates.
• documentation/false_positives.md: false-positive policy and known tradeoffs.

Notes

• Most v0.1.0 recommended rules are intentionally conservative warnings.
• self_referencing_computed ships as error because it detects a direct reactive cycle.
• Future error-level rules will require reproducible evidence and dedicated documentation.
• The package is development-only and does not add runtime dependencies to apps.