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array-type

Enforce a consistent array type syntax.

Targeted pattern scope​

This rule targets TypeScript array type annotations.

What this rule reports​

This rule reports array types that do not match the configured style.

Why this rule exists​

Mixing Array<T> and T[] makes signatures harder to scan and causes avoidable style churn.

❌ Incorrect​

type Values = Array<string>;

✅ Correct​

type Values = string[];

Behavior and migration notes​

This rule forwards options and behavior to @typescript-eslint/array-type.

Additional examples​

// with default @typescript-eslint/array-type options
type Values = Array<string>;
// ❌ reported

type ValuesFixed = string[];
// ✅ valid

ESLint flat config example​

import etcMisc from "eslint-plugin-etc-misc";

export default [
 {
  plugins: { "etc-misc": etcMisc },
  rules: {
   "etc-misc/array-type": "error",
  },
 },
];

When not to use it​

Disable this rule if your project intentionally allows mixed array type styles.

Package documentation​

Rule catalog ID: R001

Further reading​

Adoption resources​

  • Start at warning level in CI, then move to error after cleanup.
  • Use focused codemods/autofix batches per package or directory.