Unicorn

223 rules eslint-plugin-unicorn@76.0.0

Complete effective rule inventory.

Docs

unicorn/no-typeof-undefined
Disallow comparing undefined using typeof.

: error in All Unicorn contexts

Autofix available; suggestions available
unicorn/no-uncalled-method
Disallow referencing methods without calling them.

: error in All Unicorn contexts

No autofix
unicorn/no-undeclared-class-members
Require class members to be declared.

: error in All Unicorn contexts

No autofix; suggestions available
unicorn/no-unnecessary-array-flat-depth
Disallow using 1 as the depth argument of Array#flat().

: error in All Unicorn contexts

Autofix available
unicorn/no-unnecessary-array-flat-map
Disallow Array#flatMap() callbacks that only wrap a single item.

: error in All Unicorn contexts

Autofix available; suggestions available
unicorn/no-unnecessary-array-splice-count
Disallow using .length or Infinity as the deleteCount or skipCount argument of Array#{splice,toSpliced}().

: error in All Unicorn contexts

Autofix available
unicorn/no-unnecessary-await
Disallow awaiting non-promise values.

: error in All Unicorn contexts

Autofix available
unicorn/no-unnecessary-boolean-comparison
Disallow unnecessary comparisons against boolean literals.

: error in All Unicorn contexts

Autofix available
unicorn/no-unnecessary-fetch-options
Disallow unnecessary options in fetch() and new Request().

: error in All Unicorn contexts

Autofix available
unicorn/no-unnecessary-global-this
Disallow unnecessary globalThis references.

: error in All Unicorn contexts

Autofix available
unicorn/no-unnecessary-nested-ternary
Disallow unnecessary nested ternary expressions.

: error in All Unicorn contexts

Autofix available
unicorn/no-unnecessary-polyfills
Enforce the use of built-in methods instead of unnecessary polyfills.

: error in All Unicorn contexts

No autofix
unicorn/no-unnecessary-slice-end
Disallow using .length or Infinity as the end argument of {Array,String,TypedArray}#slice().

: error in All Unicorn contexts

Autofix available
unicorn/no-unnecessary-splice
Disallow Array#splice() when simpler alternatives exist.

: error in All Unicorn contexts

Autofix available
unicorn/no-unnecessary-string-trim
Disallow String#trim() before String#startsWith() or String#endsWith().

: error in All Unicorn contexts

Autofix available
unicorn/no-unsafe-buffer-conversion
Prevent unsafe use of ArrayBuffer view .buffer.

: error in All Unicorn contexts

No autofix; suggestions available
unicorn/no-unsafe-dom-html
Disallow unsafe DOM HTML APIs.

: error in All Unicorn contexts

No autofix
unicorn/no-unsafe-promise-all-settled-values
Disallow reading .value from Promise.allSettled() results without a fulfilled status guard.

: error in All Unicorn contexts

No autofix
unicorn/no-unsafe-property-key
Disallow unsafe values as property keys.

: error in All Unicorn contexts

No autofix
unicorn/no-unsafe-sqlite-interpolation
Disallow interpolation into SQL strings passed to Node’s node:sqlite APIs.

: error in All Unicorn contexts

No autofix
unicorn/no-unsafe-string-replacement
Disallow non-literal replacement values in String#replace() and String#replaceAll().

: error in All Unicorn contexts

No autofix
unicorn/no-unused-builtin-method-return
Disallow ignoring the return value of selected built-in methods.

: error in All Unicorn contexts

No autofix
unicorn/no-unused-iterator-helper
Disallow discarding lazy iterator helpers.

: error in All Unicorn contexts

No autofix; suggestions available
unicorn/no-useless-boolean-cast
Disallow unnecessary Boolean() casts in array predicate callbacks.

: error in All Unicorn contexts

Autofix available
unicorn/no-useless-coercion
Disallow useless type coercions of values that are already of the target type.

: error in All Unicorn contexts

Autofix available
unicorn/no-useless-collection-argument
Disallow useless values or fallbacks in Set, Map, WeakSet, or WeakMap.

: error in All Unicorn contexts

Autofix available; suggestions available
unicorn/no-useless-compound-assignment
Disallow useless compound assignments such as x += 0.

: error in All Unicorn contexts

No autofix; suggestions available
unicorn/no-useless-concat
Disallow useless concatenation of literals.

: error in All Unicorn contexts

Autofix available
unicorn/no-useless-continue
Disallow useless continue statements.

: error in All Unicorn contexts

Autofix available
unicorn/no-useless-delete-check
Disallow unnecessary existence checks before deletion.

: error in All Unicorn contexts

Autofix available; suggestions available
unicorn/no-useless-else
Disallow else after a statement that exits.

: error in All Unicorn contexts

Autofix available
unicorn/no-useless-error-capture-stack-trace
Disallow unnecessary Error.captureStackTrace(…).

: error in All Unicorn contexts

Autofix available
unicorn/no-useless-fallback-in-spread
Disallow useless fallback when spreading in object literals.

: error in All Unicorn contexts

Autofix available
unicorn/no-useless-iterator-to-array
Disallow unnecessary .toArray() on iterators.

: error in All Unicorn contexts

Autofix available; suggestions available
unicorn/no-useless-length-check
Disallow useless array length check.

: error in All Unicorn contexts

Autofix available
unicorn/no-useless-logical-operand
Disallow unnecessary operands in logical expressions involving boolean literals.

: error in All Unicorn contexts

Autofix available
unicorn/no-useless-override
Disallow useless overrides of class methods.

: error in All Unicorn contexts

Autofix available
unicorn/no-useless-promise-resolve-reject
Disallow returning/yielding Promise.resolve/reject() in async functions or promise callbacks

: error in All Unicorn contexts

Autofix available
unicorn/no-useless-re-export
Disallow redundant re-exports.

: error in All Unicorn contexts

No autofix
unicorn/no-useless-recursion
Disallow simple recursive function calls that can be replaced with a loop.

: error in All Unicorn contexts

No autofix

Rules