arrayTypes

Reports array type syntax that doesn't match the configured style.

✅ This rule is included in the ts stylistic presets.

TypeScript provides two equivalent ways to define an array type: T[] and Array<T>. Using the shorthand T[] syntax consistently is more concise and idiomatic.

This rule reports when Array<T> or ReadonlyArray<T> is used instead of the shorthand syntax.

Examples

❌ Incorrect

const values: Array<string> = [];

function process(items: Array<number>): void {}

type StringArray = Array<string>;

const values: ReadonlyArray<string> = [];

✅ Correct

const values: string[] = [];

function process(items: number[]): void {}

type StringArray = string[];

const values: readonly string[] = [];

Options

This rule is not configurable.

When Not To Use It

If your codebase uses Array<T> consistently, or if you prefer the generic syntax for its explicit nature, you may disable this rule.

Further Reading

• TypeScript: Array Types

Equivalents in Other Linters

• Biome: useConsistentArrayType
• ESLint: @typescript-eslint/array-type
• Oxlint: typescript/array-type