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useConsistentArrayType

src/content/docs/linter/rules/use-consistent-array-type.mdx

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<Tabs> <TabItem label="TypeScript and TSX" icon="seti:typescript"> ## Summary - Rule available since: `v1.5.0` - Diagnostic Category: [`lint/style/useConsistentArrayType`](/reference/diagnostics#diagnostic-category) - This rule isn't recommended, so you need to enable it. - This rule has an [**unsafe**](/linter/#unsafe-fixes) fix. - The default severity of this rule is [**information**](/reference/diagnostics#information). - Sources: - Same as [`@typescript-eslint/array-type`](https://typescript-eslint.io/rules/array-type)

How to configure

json
{
	"linter": {
		"rules": {
			"style": {
				"useConsistentArrayType": "error"
			}
		}
	}
}

Description

Require consistently using either T[] or Array<T>

TypeScript provides two equivalent ways to define an array type: T[] and Array<T>. The two styles are functionally equivalent. Using the same style consistently across your codebase makes it easier for developers to read and understand array types.

Example

Invalid

ts
let invalid: Array<foo>;
<pre class="language-text"><code class="language-text">code-block.ts:1:14 <a href="https://biomejs.dev/linter/rules/use-consistent-array-type">lint/style/useConsistentArrayType</a> <span style="color: #000; background-color: #ddd;"> FIXABLE </span> ━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━ <strong><span style="color: lightgreen;">ℹ</span></strong> <span style="color: lightgreen;">Use </span><span style="color: lightgreen;"><strong>shorthand T[] syntax</strong></span><span style="color: lightgreen;"> instead of </span><span style="color: lightgreen;"><strong>Array&lt;T&gt; syntax.</strong></span> <strong><span style="color: Tomato;">&gt;</span></strong> <strong>1 │ </strong>let invalid: Array&lt;foo&gt;; <strong> │ </strong> <strong><span style="color: Tomato;">^</span></strong><strong><span style="color: Tomato;">^</span></strong><strong><span style="color: Tomato;">^</span></strong><strong><span style="color: Tomato;">^</span></strong><strong><span style="color: Tomato;">^</span></strong><strong><span style="color: Tomato;">^</span></strong><strong><span style="color: Tomato;">^</span></strong><strong><span style="color: Tomato;">^</span></strong><strong><span style="color: Tomato;">^</span></strong><strong><span style="color: Tomato;">^</span></strong> <strong>2 │ </strong> <strong><span style="color: lightgreen;">ℹ</span></strong> <span style="color: lightgreen;">Unsafe fix</span><span style="color: lightgreen;">: </span><span style="color: lightgreen;">Use </span><span style="color: lightgreen;"><strong>shorthand T[] syntax</strong></span><span style="color: lightgreen;"> to replace</span> <strong>1</strong> <strong> │ </strong><span style="color: Tomato;">-</span> <span style="color: Tomato;">l</span><span style="color: Tomato;">e</span><span style="color: Tomato;">t</span><span style="color: Tomato;"><span style="opacity: 0.8;">·</span></span><span style="color: Tomato;">i</span><span style="color: Tomato;">n</span><span style="color: Tomato;">v</span><span style="color: Tomato;">a</span><span style="color: Tomato;">l</span><span style="color: Tomato;">i</span><span style="color: Tomato;">d</span><span style="color: Tomato;">:</span><span style="color: Tomato;"><span style="opacity: 0.8;">·</span></span><span style="color: Tomato;"><strong>A</strong></span><span style="color: Tomato;"><strong>r</strong></span><span style="color: Tomato;"><strong>r</strong></span><span style="color: Tomato;"><strong>a</strong></span><span style="color: Tomato;"><strong>y</strong></span><span style="color: Tomato;"><strong>&lt;</strong></span><span style="color: Tomato;">f</span><span style="color: Tomato;">o</span><span style="color: Tomato;">o</span><span style="color: Tomato;"><strong>&gt;</strong></span><span style="color: Tomato;">;</span> <strong>1</strong><strong> │ </strong><span style="color: MediumSeaGreen;">+</span> <span style="color: MediumSeaGreen;">l</span><span style="color: MediumSeaGreen;">e</span><span style="color: MediumSeaGreen;">t</span><span style="color: MediumSeaGreen;"><span style="opacity: 0.8;">·</span></span><span style="color: MediumSeaGreen;">i</span><span style="color: MediumSeaGreen;">n</span><span style="color: MediumSeaGreen;">v</span><span style="color: MediumSeaGreen;">a</span><span style="color: MediumSeaGreen;">l</span><span style="color: MediumSeaGreen;">i</span><span style="color: MediumSeaGreen;">d</span><span style="color: MediumSeaGreen;">:</span><span style="color: MediumSeaGreen;"><span style="opacity: 0.8;">·</span></span><span style="color: MediumSeaGreen;">f</span><span style="color: MediumSeaGreen;">o</span><span style="color: MediumSeaGreen;">o</span><span style="color: MediumSeaGreen;"><strong>[</strong></span><span style="color: MediumSeaGreen;"><strong>]</strong></span><span style="color: MediumSeaGreen;">;</span> <strong>2</strong> <strong>2</strong><strong> │ </strong> </code></pre>
ts
let invalid: Promise<Array<string>>;
<pre class="language-text"><code class="language-text">code-block.ts:1:22 <a href="https://biomejs.dev/linter/rules/use-consistent-array-type">lint/style/useConsistentArrayType</a> <span style="color: #000; background-color: #ddd;"> FIXABLE </span> ━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━ <strong><span style="color: lightgreen;">ℹ</span></strong> <span style="color: lightgreen;">Use </span><span style="color: lightgreen;"><strong>shorthand T[] syntax</strong></span><span style="color: lightgreen;"> instead of </span><span style="color: lightgreen;"><strong>Array&lt;T&gt; syntax.</strong></span> <strong><span style="color: Tomato;">&gt;</span></strong> <strong>1 │ </strong>let invalid: Promise&lt;Array&lt;string&gt;&gt;; <strong> │ </strong> <strong><span style="color: Tomato;">^</span></strong><strong><span style="color: Tomato;">^</span></strong><strong><span style="color: Tomato;">^</span></strong><strong><span style="color: Tomato;">^</span></strong><strong><span style="color: Tomato;">^</span></strong><strong><span style="color: Tomato;">^</span></strong><strong><span style="color: Tomato;">^</span></strong><strong><span style="color: Tomato;">^</span></strong><strong><span style="color: Tomato;">^</span></strong><strong><span style="color: Tomato;">^</span></strong><strong><span style="color: Tomato;">^</span></strong><strong><span style="color: Tomato;">^</span></strong><strong><span style="color: Tomato;">^</span></strong> <strong>2 │ </strong> <strong><span style="color: lightgreen;">ℹ</span></strong> <span style="color: lightgreen;">Unsafe fix</span><span style="color: lightgreen;">: </span><span style="color: lightgreen;">Use </span><span style="color: lightgreen;"><strong>shorthand T[] syntax</strong></span><span style="color: lightgreen;"> to replace</span> <strong>1</strong> <strong> │ </strong><span style="color: Tomato;">-</span> <span style="color: Tomato;">l</span><span style="color: Tomato;">e</span><span style="color: Tomato;">t</span><span style="color: Tomato;"><span style="opacity: 0.8;">·</span></span><span style="color: Tomato;">i</span><span style="color: Tomato;">n</span><span style="color: Tomato;">v</span><span style="color: Tomato;">a</span><span style="color: Tomato;">l</span><span style="color: Tomato;">i</span><span style="color: Tomato;">d</span><span style="color: Tomato;">:</span><span style="color: Tomato;"><span style="opacity: 0.8;">·</span></span><span style="color: Tomato;">P</span><span style="color: Tomato;">r</span><span style="color: Tomato;">o</span><span style="color: Tomato;">m</span><span style="color: Tomato;">i</span><span style="color: Tomato;">s</span><span style="color: Tomato;">e</span><span style="color: Tomato;">&lt;</span><span style="color: Tomato;"><strong>A</strong></span><span style="color: Tomato;"><strong>r</strong></span><span style="color: Tomato;"><strong>r</strong></span><span style="color: Tomato;"><strong>a</strong></span><span style="color: Tomato;"><strong>y</strong></span><span style="color: Tomato;"><strong>&lt;</strong></span><span style="color: Tomato;">s</span><span style="color: Tomato;">t</span><span style="color: Tomato;">r</span><span style="color: Tomato;">i</span><span style="color: Tomato;">n</span><span style="color: Tomato;">g</span><span style="color: Tomato;"><strong>&gt;</strong></span><span style="color: Tomato;">&gt;</span><span style="color: Tomato;">;</span> <strong>1</strong><strong> │ </strong><span style="color: MediumSeaGreen;">+</span> <span style="color: MediumSeaGreen;">l</span><span style="color: MediumSeaGreen;">e</span><span style="color: MediumSeaGreen;">t</span><span style="color: MediumSeaGreen;"><span style="opacity: 0.8;">·</span></span><span style="color: MediumSeaGreen;">i</span><span style="color: MediumSeaGreen;">n</span><span style="color: MediumSeaGreen;">v</span><span style="color: MediumSeaGreen;">a</span><span style="color: MediumSeaGreen;">l</span><span style="color: MediumSeaGreen;">i</span><span style="color: MediumSeaGreen;">d</span><span style="color: MediumSeaGreen;">:</span><span style="color: MediumSeaGreen;"><span style="opacity: 0.8;">·</span></span><span style="color: MediumSeaGreen;">P</span><span style="color: MediumSeaGreen;">r</span><span style="color: MediumSeaGreen;">o</span><span style="color: MediumSeaGreen;">m</span><span style="color: MediumSeaGreen;">i</span><span style="color: MediumSeaGreen;">s</span><span style="color: MediumSeaGreen;">e</span><span style="color: MediumSeaGreen;">&lt;</span><span style="color: MediumSeaGreen;">s</span><span style="color: MediumSeaGreen;">t</span><span style="color: MediumSeaGreen;">r</span><span style="color: MediumSeaGreen;">i</span><span style="color: MediumSeaGreen;">n</span><span style="color: MediumSeaGreen;">g</span><span style="color: MediumSeaGreen;"><strong>[</strong></span><span style="color: MediumSeaGreen;"><strong>]</strong></span><span style="color: MediumSeaGreen;">&gt;</span><span style="color: MediumSeaGreen;">;</span> <strong>2</strong> <strong>2</strong><strong> │ </strong> </code></pre>
ts
let invalid3: Array<Foo<Bar>>;
<pre class="language-text"><code class="language-text">code-block.ts:1:15 <a href="https://biomejs.dev/linter/rules/use-consistent-array-type">lint/style/useConsistentArrayType</a> <span style="color: #000; background-color: #ddd;"> FIXABLE </span> ━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━ <strong><span style="color: lightgreen;">ℹ</span></strong> <span style="color: lightgreen;">Use </span><span style="color: lightgreen;"><strong>shorthand T[] syntax</strong></span><span style="color: lightgreen;"> instead of </span><span style="color: lightgreen;"><strong>Array&lt;T&gt; syntax.</strong></span> <strong><span style="color: Tomato;">&gt;</span></strong> <strong>1 │ </strong>let invalid3: Array&lt;Foo&lt;Bar&gt;&gt;; <strong> │ </strong> <strong><span style="color: Tomato;">^</span></strong><strong><span style="color: Tomato;">^</span></strong><strong><span style="color: Tomato;">^</span></strong><strong><span style="color: Tomato;">^</span></strong><strong><span style="color: Tomato;">^</span></strong><strong><span style="color: Tomato;">^</span></strong><strong><span style="color: Tomato;">^</span></strong><strong><span style="color: Tomato;">^</span></strong><strong><span style="color: Tomato;">^</span></strong><strong><span style="color: Tomato;">^</span></strong><strong><span style="color: Tomato;">^</span></strong><strong><span style="color: Tomato;">^</span></strong><strong><span style="color: Tomato;">^</span></strong><strong><span style="color: Tomato;">^</span></strong><strong><span style="color: Tomato;">^</span></strong> <strong>2 │ </strong> <strong><span style="color: lightgreen;">ℹ</span></strong> <span style="color: lightgreen;">Unsafe fix</span><span style="color: lightgreen;">: </span><span style="color: lightgreen;">Use </span><span style="color: lightgreen;"><strong>shorthand T[] syntax</strong></span><span style="color: lightgreen;"> to replace</span> <strong>1</strong> <strong> │ </strong><span style="color: Tomato;">-</span> <span style="color: Tomato;">l</span><span style="color: Tomato;">e</span><span style="color: Tomato;">t</span><span style="color: Tomato;"><span style="opacity: 0.8;">·</span></span><span style="color: Tomato;">i</span><span style="color: Tomato;">n</span><span style="color: Tomato;">v</span><span style="color: Tomato;">a</span><span style="color: Tomato;">l</span><span style="color: Tomato;">i</span><span style="color: Tomato;">d</span><span style="color: Tomato;">3</span><span style="color: Tomato;">:</span><span style="color: Tomato;"><span style="opacity: 0.8;">·</span></span><span style="color: Tomato;"><strong>A</strong></span><span style="color: Tomato;"><strong>r</strong></span><span style="color: Tomato;"><strong>r</strong></span><span style="color: Tomato;"><strong>a</strong></span><span style="color: Tomato;"><strong>y</strong></span><span style="color: Tomato;"><strong>&lt;</strong></span><span style="color: Tomato;">F</span><span style="color: Tomato;">o</span><span style="color: Tomato;">o</span><span style="color: Tomato;">&lt;</span><span style="color: Tomato;">B</span><span style="color: Tomato;">a</span><span style="color: Tomato;">r</span><span style="color: Tomato;"><strong>&gt;</strong></span><span style="color: Tomato;">&gt;</span><span style="color: Tomato;">;</span> <strong>1</strong><strong> │ </strong><span style="color: MediumSeaGreen;">+</span> <span style="color: MediumSeaGreen;">l</span><span style="color: MediumSeaGreen;">e</span><span style="color: MediumSeaGreen;">t</span><span style="color: MediumSeaGreen;"><span style="opacity: 0.8;">·</span></span><span style="color: MediumSeaGreen;">i</span><span style="color: MediumSeaGreen;">n</span><span style="color: MediumSeaGreen;">v</span><span style="color: MediumSeaGreen;">a</span><span style="color: MediumSeaGreen;">l</span><span style="color: MediumSeaGreen;">i</span><span style="color: MediumSeaGreen;">d</span><span style="color: MediumSeaGreen;">3</span><span style="color: MediumSeaGreen;">:</span><span style="color: MediumSeaGreen;"><span style="opacity: 0.8;">·</span></span><span style="color: MediumSeaGreen;">F</span><span style="color: MediumSeaGreen;">o</span><span style="color: MediumSeaGreen;">o</span><span style="color: MediumSeaGreen;">&lt;</span><span style="color: MediumSeaGreen;">B</span><span style="color: MediumSeaGreen;">a</span><span style="color: MediumSeaGreen;">r</span><span style="color: MediumSeaGreen;">&gt;</span><span style="color: MediumSeaGreen;"><strong>[</strong></span><span style="color: MediumSeaGreen;"><strong>]</strong></span><span style="color: MediumSeaGreen;">;</span> <strong>2</strong> <strong>2</strong><strong> │ </strong> </code></pre>

Valid

ts
const valid: Array<string | number> = ['a', 'b'];
const valid: Array<{ prop: string }> = [{ prop: 'a' }];
const valid: Array<() => void> = [() => {}];
const valid: MyType[] = ['a', 'b'];
const valid: string[] = ['a', 'b'];
const valid: readonly string[] = ['a', 'b'];

Options

Use the options to specify the syntax of array declarations to use.

json
{
	"linter": {
		"rules": {
			"style": {
				"useConsistentArrayType": {
					"options": {
						"syntax": "shorthand"
					}
				}
			}
		}
	}
}

syntax

The syntax to use:

  • generic: array declarations will be converted to Array<T> or ReadonlyArray<T>
  • shorthand: array declarations will be converted to T[] or readonly T[]

Default: shorthand

</TabItem> </Tabs>