Presets

Use one of these presets based on how aggressively you want to enforce plugin rules.

• Preset key legend:
  • 🟢 — typefest.configs.minimal
  • 🟡 — typefest.configs.recommended
  • 🟠 — typefest.configs["recommended-type-checked"]
  • 🔴 — typefest.configs.strict
  • 🟣 — typefest.configs.all
  • 🧪 — typefest.configs.experimental
  • 💠 — typefest.configs["type-fest/types"]
  • ✴️ — typefest.configs["ts-extras/type-guards"]

Each preset page in this section includes:

• when to use it
• exact config key
• copy/paste Flat Config snippet

Related guides:

• Preset selection strategy
• Type-aware linting readiness
• Adoption checklist
• Rollout and fix safety

Rule matrix

• Fix legend:
  • 🔧 = autofixable
  • 💡 = suggestions available
  • — = report only
• Preset key legend:
  • 🟢 — typefest.configs.minimal
  • 🟡 — typefest.configs.recommended
  • 🟠 — typefest.configs["recommended-type-checked"]
  • 🔴 — typefest.configs.strict
  • 🟣 — typefest.configs.all
  • 🧪 — typefest.configs.experimental
  • 💠 — typefest.configs["type-fest/types"]
  • ✴️ — typefest.configs["ts-extras/type-guards"]

Rule	Fix	Preset key
prefer-ts-extras-array-at	🔧	🔴 🟣
prefer-ts-extras-array-concat	🔧	🔴 🟣
prefer-ts-extras-array-find	🔧	🟣
prefer-ts-extras-array-find-last	🔧	🔴 🟣
prefer-ts-extras-array-find-last-index	🔧	🟣
prefer-ts-extras-array-first	🔧 💡	🔴 🟣
prefer-ts-extras-array-includes	🔧 💡	🟠 🔴 🟣 ✴️
prefer-ts-extras-array-join	🔧	🔴 🟣
prefer-ts-extras-array-last	🔧 💡	🟠 🔴 🟣
prefer-ts-extras-as-writable	🔧	🔴 🟣
prefer-ts-extras-assert-defined	🔧 💡	🟡 🔴 🟣 ✴️
prefer-ts-extras-assert-error	💡	🟡 🔴 🟣 ✴️
prefer-ts-extras-assert-present	🔧 💡	🟡 🔴 🟣 ✴️
prefer-ts-extras-is-defined	🔧	🟡 🔴 🟣 ✴️
prefer-ts-extras-is-defined-filter	🔧	🟢 🟡 🔴 🟣 ✴️
prefer-ts-extras-is-empty	🔧	🟠 🔴 🟣 ✴️
prefer-ts-extras-is-equal-type	💡	🟣
prefer-ts-extras-is-finite	🔧	🟡 🔴 🟣 ✴️
prefer-ts-extras-is-infinite	🔧	🟡 🔴 🟣 ✴️
prefer-ts-extras-is-integer	🔧	🟡 🔴 🟣 ✴️
prefer-ts-extras-is-present	🔧	🟡 🔴 🟣 ✴️
prefer-ts-extras-is-present-filter	🔧	🟢 🟡 🔴 🟣 ✴️
prefer-ts-extras-is-safe-integer	🔧	🟡 🔴 🟣 ✴️
prefer-ts-extras-key-in	🔧	🟡 🔴 🟣 ✴️
prefer-ts-extras-not	🔧	🟡 🔴 🟣 ✴️
prefer-ts-extras-object-entries	🔧	🔴 🟣
prefer-ts-extras-object-from-entries	🔧	🔴 🟣
prefer-ts-extras-object-has-in	🔧 💡	🟡 🔴 🟣 ✴️
prefer-ts-extras-object-has-own	🔧 💡	🟡 🔴 🟣 ✴️
prefer-ts-extras-object-keys	🔧	🔴 🟣
prefer-ts-extras-object-map-values	—	🧪
prefer-ts-extras-object-values	🔧	🔴 🟣
prefer-ts-extras-safe-cast-to	🔧	🟠 🔴 🟣 ✴️
prefer-ts-extras-set-has	🔧 💡	🟠 🔴 🟣 ✴️
prefer-ts-extras-string-split	🔧	🔴 🟣
prefer-type-fest-abstract-constructor	🔧	🟡 🔴 🟣 💠
prefer-type-fest-and-all	🔧	🟡 🔴 🟣 💠
prefer-type-fest-array-length	🔧	🟠 🔴 🟣
prefer-type-fest-arrayable	🔧	🟢 🟡 🔴 🟣 💠
prefer-type-fest-async-return-type	🔧	🟡 🔴 🟣 💠
prefer-type-fest-asyncify	—	🧪
prefer-type-fest-conditional-except	—	🧪
prefer-type-fest-conditional-keys	—	🧪
prefer-type-fest-conditional-pick	🔧	🟡 🔴 🟣 💠
prefer-type-fest-conditional-pick-deep	🔧	🟡 🔴 🟣 💠
prefer-type-fest-constructor	🔧	🟡 🔴 🟣 💠
prefer-type-fest-distributed-omit	—	🧪
prefer-type-fest-distributed-pick	—	🧪
prefer-type-fest-except	🔧	🟢 🟡 🔴 🟣 💠
prefer-type-fest-if	🔧	🟡 🔴 🟣 💠
prefer-type-fest-iterable-element	🔧	🟡 🔴 🟣 💠
prefer-type-fest-json-array	🔧	🟢 🟡 🔴 🟣 💠
prefer-type-fest-json-object	🔧	🟢 🟡 🔴 🟣 💠
prefer-type-fest-json-primitive	🔧	🟢 🟡 🔴 🟣 💠
prefer-type-fest-json-value	💡	🟢 🟡 🔴 🟣 💠
prefer-type-fest-keys-of-union	🔧	🟡 🔴 🟣 💠
prefer-type-fest-less-than	🔧	🟡 🔴 🟣 💠
prefer-type-fest-less-than-or-equal	🔧	🟡 🔴 🟣 💠
prefer-type-fest-literal-union	🔧	🟡 🔴 🟣 💠
prefer-type-fest-merge	—	🧪
prefer-type-fest-merge-exclusive	🔧	🟡 🔴 🟣 💠
prefer-type-fest-non-empty-tuple	🔧	🟡 🔴 🟣 💠
prefer-type-fest-omit-index-signature	🔧	🟡 🔴 🟣 💠
prefer-type-fest-optional	🔧	🟡 🔴 🟣 💠
prefer-type-fest-or-all	🔧	🟡 🔴 🟣 💠
prefer-type-fest-partial-deep	🔧	🟡 🔴 🟣 💠
prefer-type-fest-pick-index-signature	—	🧪
prefer-type-fest-primitive	🔧	🟢 🟡 🔴 🟣 💠
prefer-type-fest-promisable	🔧	🟢 🟡 🔴 🟣 💠
prefer-type-fest-readonly-deep	🔧	🟡 🔴 🟣 💠
prefer-type-fest-require-all-or-none	🔧	🟡 🔴 🟣 💠
prefer-type-fest-require-at-least-one	🔧	🟡 🔴 🟣 💠
prefer-type-fest-require-exactly-one	🔧	🟡 🔴 🟣 💠
prefer-type-fest-require-one-or-none	🔧	🟡 🔴 🟣 💠
prefer-type-fest-required-deep	🔧	🟡 🔴 🟣 💠
prefer-type-fest-schema	🔧	🟡 🔴 🟣 💠
prefer-type-fest-set-non-nullable	🔧	🟡 🔴 🟣 💠
prefer-type-fest-set-optional	🔧	🟡 🔴 🟣 💠
prefer-type-fest-set-readonly	🔧	🟡 🔴 🟣 💠
prefer-type-fest-set-required	🔧	🟡 🔴 🟣 💠
prefer-type-fest-set-return-type	—	🧪
prefer-type-fest-simplify	🔧	🟡 🔴 🟣 💠
prefer-type-fest-stringified	—	🧪
prefer-type-fest-tagged-brands	🔧	🟡 🔴 🟣 💠
prefer-type-fest-tuple-of	🔧	🟡 🔴 🟣 💠
prefer-type-fest-union-member	🔧	🟡 🔴 🟣 💠
prefer-type-fest-union-to-intersection	—	🧪
prefer-type-fest-union-to-tuple	🔧	🟡 🔴 🟣 💠
prefer-type-fest-unknown-array	🔧	🟡 🔴 🟣 💠
prefer-type-fest-unknown-map	🔧	🟡 🔴 🟣 💠
prefer-type-fest-unknown-record	🔧	🟢 🟡 🔴 🟣 💠
prefer-type-fest-unknown-set	🔧	🟡 🔴 🟣 💠
prefer-type-fest-unwrap-tagged	🔧	🟡 🔴 🟣 💠
prefer-type-fest-value-of	🔧	🟡 🔴 🟣 💠
prefer-type-fest-writable	🔧	🟡 🔴 🟣 💠
prefer-type-fest-writable-deep	🔧	🟡 🔴 🟣 💠