@polkadot/util/u8a/toU8a.js

A collection of useful utilities for @polkadot

import { hexToU8a } from '../hex/toU8a.js';
import { isBuffer } from '../is/buffer.js';
import { isHex } from '../is/hex.js';
import { isU8a } from '../is/u8a.js';
import { stringToU8a } from '../string/toU8a.js';
/**
 * @name u8aToU8a
 * @summary Creates a Uint8Array value from a Uint8Array, Buffer, string or hex input.
 * @description
 * `null` or `undefined` inputs returns a `[]` result, Uint8Array values returns the value, hex strings returns a Uint8Array representation.
 * @example
 * <BR>
 *
 * ```javascript
 * import { u8aToU8a } from '@polkadot/util';
 *
 * u8aToU8a(new Uint8Array([0x12, 0x34]); // => Uint8Array([0x12, 0x34])
 * u8aToU8a(0x1234); // => Uint8Array([0x12, 0x34])
 * ```
 */
export function u8aToU8a(value) {
    return isU8a(value)
        // NOTE isBuffer needs to go here since it actually extends
        // Uint8Array on Node.js environments, so all Buffer are Uint8Array,
        // but Uint8Array is not Buffer
        ? isBuffer(value)
            ? new Uint8Array(value)
            : value
        : isHex(value)
            ? hexToU8a(value)
            : Array.isArray(value)
                ? new Uint8Array(value)
                : stringToU8a(value);
}