import type { Sum } from '../../Array/sum.js';
declare global {
  interface Array<T> {
    /**
     * Returns the sum of all elements in the array (only for number or bigint arrays).
     *
     * **Do not** use it with an array of bigint with zero elements, as it will return `0` instead of `0n`.
     *
     * @throws {TypeError} If the array contains non-numbers or mixed numbers and bigints.
     *
     * @example
     * ```typescript
     * const arr = [1, 2, 3];
     * arr.sum(); // => 6
     * ```
     */
    sum(): Sum<this>;
  }
  interface ReadonlyArray<T> {
    /**
     * Returns the sum of all elements in the array (only for number or bigint arrays).
     *
     * **Do not** use it with an array of bigint with zero elements, as it will return `0` instead of `0n`.
     *
     * @throws {TypeError} If the array contains non-numbers or mixed numbers and bigints.
     *
     * @example
     * ```typescript
     * const arr = [1, 2, 3];
     * arr.sum(); // => 6
     * ```
     */
    sum(): Sum<this>;
  }
}
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