/**
 * Sets a bit in the mask. Modifies the mask in place.
 *
 * Mask is represented as a Uint8Array, which will be serialized element-by-element as a mask.
 * This means that `indexFromStart` enumerates all bits in the mask in the order they will be serialized:
 *
 * @example
 * setMaskBit(new Uint8Array([0b00000000, 0b00000000]), 0)
 * // => new Uint8Array([0b10000000, 0b00000000])
 *
 * @example
 * setMaskBit(new Uint8Array([0b00000000, 0b00000000]), 8)
 * // => new Uint8Array([0b00000000, 0b10000000])
 *
 * @param array Uint8Array mask
 * @param indexFromStart bit index in the mask
 */
export declare function setMaskBit(array: Uint8Array, indexFromStart: number): void;
/**
 * Reads a bit in the mask
 *
 * Mask is represented as a Uint8Array, which will be serialized element-by-element as a mask.
 * This means that `indexFromStart` enumerates all bits in the mask in the order they will be serialized:
 *
 * @example
 * getMaskBit(new Uint8Array([0b10000000, 0b00000000]), 0)
 * // => 1
 *
 * @example
 * getMaskBit(new Uint8Array([0b10000000, 0b00000000]), 8)
 * // => 0
 *
 * @param array Uint8Array mask
 * @param indexFromStart bit index in the mask
 */
export declare function getMaskBit(array: Uint8Array, indexFromStart: number): 1 | 0;