declare global {
  interface Array<T> {
    /**
     * Returns a duplicate-free version of the array,
     * in which only the first occurrence of each element is kept (using `equals` for equality comparisons).
     *
     * @example
     * ```typescript
     * const arr = [1, 2, 3, 1, 2, 3, { a: [2], c: { d: 10 } }, , { a: [2], c: { d: 10 } }];
     * unique(arr); // => [1, 2, 3, { a: [2], c: { d: 10 } }]
     * ```
     */
    unique(): T[];
  }
  interface ReadonlyArray<T> {
    /**
     * Returns a duplicate-free version of the array,
     * in which only the first occurrence of each element is kept (using `equals` for equality comparisons).
     *
     * @example
     * ```typescript
     * const arr = [1, 2, 3, 1, 2, 3, { a: [2], c: { d: 10 } }, , { a: [2], c: { d: 10 } }];
     * unique(arr); // => [1, 2, 3, { a: [2], c: { d: 10 } }]
     * ```
     */
    unique(): T[];
  }
}
export {};
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