eslint/rules/arrays

Arrays: Array methods, array creation, sorting and searching. Rules of ESLint, typescript-eslint and SonarJS (the Sonar way profile of SonarQube) on this subject, every rule listed; the TypeScript rules apply to TypeScript files only.

26 rules, 16 on. Source: lint/eslint/rules/arrays.mjs.

Rule	Setting	Files	What it checks	Why
array-callback-return	error, {"allowImplicit":true,"checkForEach":true}	JS + TS	Enforce return statements in callbacks of array methods	Custom: a bare return; is allowed; forEach callbacks must not return a value.
no-sparse-arrays	error	JS + TS	Disallow sparse arrays	—
id-length	off	JS + TS	Enforce minimum and maximum identifier lengths	—
no-array-constructor	error	JS + TS	Disallow Array constructors	Replaced by the TS version.
no-useless-concat	info	JS + TS	Disallow unnecessary concatenation of literals or template literals	—
sort-keys	off	JS + TS	Require object keys to be sorted	—
sort-vars	off	JS + TS	Require variables within the same declaration block to be sorted	—
sonarjs/no-incorrect-string-concat	off	JS + TS	Strings and non-strings should not be added	Off: not in the Sonar way profile of SonarQube.
sonarjs/array-callback-without-return	off	JS + TS	Callbacks of array methods should have return statements	Off: duplicate of array-callback-return.
sonarjs/no-alphabetical-sort	off	JS + TS	"Array.prototype.sort()" and "Array.prototype.toSorted()" should use a compare function	Off: duplicate of @typescript-eslint/require-array-sort-compare.
sonarjs/no-array-delete	off	JS + TS	"delete" should not be used on arrays	Off: duplicate of @typescript-eslint/no-array-delete.
sonarjs/array-constructor	off	JS + TS	Array constructors should not be used	Off: not in the Sonar way profile of SonarQube.
sonarjs/no-associative-arrays	warn	JS + TS	Array indexes should be numeric	—
sonarjs/no-element-overwrite	error	JS + TS	Collection elements should not be replaced unconditionally	—
sonarjs/no-in-misuse	error	JS + TS	"in" should not be used on arrays	—
sonarjs/no-misleading-array-reverse	error	JS + TS	Array-mutating methods should not be used misleadingly	—
sonarjs/reduce-initial-value	error	JS + TS	"Array.reduce()" calls should include an initial value	—
@typescript-eslint/array-type	error	TS	Require consistently using either T[] or Array<T> for arrays	—
no-array-constructor	off	TS	Disallow Array constructors	Replaced by the TS version.
@typescript-eslint/no-array-constructor	error	TS	Disallow generic Array constructors	—
@typescript-eslint/no-array-delete	error	TS	Disallow using the delete operator on array values	—
@typescript-eslint/prefer-find	info	TS	Enforce the use of Array.prototype.find() over Array.prototype.filter() followed by [0] when looking for a single result	—
@typescript-eslint/prefer-includes	error	TS	Enforce includes method over indexOf method	—
@typescript-eslint/prefer-reduce-type-parameter	error	TS	Enforce using type parameter when calling Array#reduce instead of using a type assertion	—
@typescript-eslint/require-array-sort-compare	error	TS	Require Array#sort and Array#toSorted calls to always provide a compareFunction	—
@typescript-eslint/sort-type-constituents	off	TS	Enforce constituents of a type union/intersection to be sorted alphabetically	Deprecated: replaced by eslint-plugin-perfectionist.