Changelog

0.1.0

Initial release — 14 checks plus shared helpers.

Checks

• MikaCredoRules.ErrorMessageRequired — flags {:error, "string literal"} tuples; use %ErrorMessage{}. Params: :excluded_paths, :also_flag_atoms.
• MikaCredoRules.GenServerRequiresHandleContinue — flags real work in init/1 instead of handle_continue/2. Param: :allowed_modules (bare modules or surgical {module, function} grants).
• MikaCredoRules.LoggerModulePrefixAndInspect — Logger messages must start with the #{__MODULE__}: prefix and wrap interpolated values in inspect/1 (a bare #{value} crashes at runtime on non-String.Chars values). Params: :logger_functions, :enforce_prefix, :allowed_interpolations.
• MikaCredoRules.NoApplicationEnvOutsideConfig — flags any read or write of application env outside a config module. Catches every spelling, including aliases (with multi-alias and shadowing support), Elixir.Application, and :application. Params: :config_files, :functions, :erlang_functions.
• MikaCredoRules.NoBlanketRescue — flags catch-all rescue clauses that swallow exceptions without reraising, raising, or logging. Param: :allowed_recovery_calls.
• MikaCredoRules.NoMixEnvAtRuntime — flags Mix.env()/Mix.target() in compiled code (crashes in releases). use Mix.Task modules and mix/tasks/ paths exempt. Params: :functions, :excluded_paths.
• MikaCredoRules.NoMockingLibraries — flags any reference to Mox, Hammox, Mock, Mimic, Patch, or :meck; use behaviours + dependency injection. Exact-segment matching with full alias resolution. Params: :modules, :erlang_modules.
• MikaCredoRules.NoNilComparison — flags x == nil in every operator spelling; use is_nil/1. Param: :operators.
• MikaCredoRules.NoProcessSleepInTests — flags Process.sleep/1 and :timer.sleep/1 in test files. Params: :test_files, :functions.
• MikaCredoRules.NoReimplementedHelper — flags local re-implementations of shared library helpers, pointing at the canonical implementation. Params: :functions (name → replacement map), :excluded_paths.
• MikaCredoRules.NoSingleLetterVariables — flags single-letter variable bindings at binding sites only; _-prefixed always allowed. Param: :allowed_names.
• MikaCredoRules.RefuteOverAssertNot — flags assert !expr / assert not expr in test files; use refute. Param: :test_files.
• MikaCredoRules.StrictEquality — flags ==/!=; use ===/!==. The Ecto query DSL is exempt, alias-aware, and scoped to the query call's own arguments; issues carry exact column numbers. Param: :ignored_functions.
• MikaCredoRules.TodosNeedTickets — flags TODO/FIXME comments without a ticket URL on the same or an adjacent line; per-todo, not per-file. Params: :tags, :ticket_url.

Shared helpers

• MikaCredoRules.SourceFilter — filename predicates for run/2 scoping guards: matches_suffix?/2, boundary-aware matches_fragment?/2 (a test/ fragment does not match lib/latest/), script_file?/1.
• MikaCredoRules.AstHelpers — module_paths/1 (both AST spellings of a module) and resolve_aliases/2 (alias folding with both the ADD and shadow-REMOVE halves).

Notes

• Path-exclusion params are unified on :excluded_paths with boundary-aware matching; include-side params keep their domain names (:config_files, :test_files).
• When enabling TodosNeedTickets, disable Credo's built-in TagTODO to avoid double-reporting — see the README installation snippet.