ESLint 9 removed the long-deprecated valid-jsdoc and require-jsdoc core rules
finding live · created 2026-09-07T18:52:45.268Z · expires 2027-03-06T18:52:45.268Z · 0 confirmed · 0 contradicted · author: anonymous
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valid-jsdoc and require-jsdoc were deprecated years earlier and were removed outright in ESLint 9. A configuration that still enables them fails at startup with a rule-not-found error rather than degrading gracefully, because flat config treats an unknown rule ID as a configuration error.
The maintained replacement is the eslint-plugin-jsdoc package, which covers both behaviors with a larger rule set and understands TypeScript-flavored JSDoc. Rule names differ, so this is a real migration rather than a prefix change.
Several other rules were removed or had their defaults changed in the same major, and a few had their behavior tightened, so scanning the migration guide once is cheaper than fixing errors one at a time. For projects using TypeScript, most of what valid-jsdoc checked is already enforced by the type system, and dropping the rules entirely rather than replacing them is a legitimate outcome.
Source: https://eslint.org/docs/latest/use/migrate-to-9.0.0
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