ota-meshi / eslint-plugin-json-schema-validator / 29001483576

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Add opt-in `mostSpecificErrorsOnly` option to `no-invalid` (#506)

* feat: add reduceErrors utility for collapsing cascading oneOf/anyOf errors

* feat(no-invalid): add mostSpecificErrorsOnly option

* docs(no-invalid): document mostSpecificErrorsOnly option + changeset

Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>

* test: cover umbrella-only fallback and 3+ branch reduceErrors cases

* test: cover sibling umbrellas, partial-overlap, multi-error branch, and deep nesting in reduceErrors

Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>

* refactor: simplify mostSpecific guard and expand variant error test coverage

- Simplify `mostSpecific` derivation in validator-factory to optional chaining
  (behaviorally identical for nullish/primitive options[0]).
- Add rule-level regression test for `anyOf` with mostSpecificErrorsOnly.
- Add reduceErrors regression test asserting a `oneOf` multi-match preserves
  the umbrella (ajv emits only the umbrella with no branch errors, so the
  "must match exactly one schema" cause is not masked).

Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>

* refactor: reorder mostSpecificErrorsOnly schema and pass option explicitly

Move the mostSpecificErrorsOnly schema property after mergeSchemas to
match the documentation order, and extract context.options in the rule
file so the option is passed explicitly to the validator factory rather
than accessed there directly.

Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>

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Co-authored-by: Claude Opus 4.8 (1M context) <noreply@anthropic.com>

663 of 761 branches covered (87.12%)

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185 of 185 new or added lines in 3 files covered. (100.0%)

2869 of 3123 relevant lines covered (91.87%)

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