/**
 * Note: produces valid hash values for `null` and `undefined`.
 * @param {string|null|undefined} string
 * @param {number} [start=0]
 * @param {number} [length] how many characters to hash, defaults to the rest of the string from `start`
 * @returns {number}
 */
export function computeStringHash(string: string | null | undefined, start?: number, length?: number): number;
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