Calculate SHA-256 hash (Node.js)

sha-256.js

/**
 * Creates a hash for a value using the SHA-256 algorithm. Returns a promise.
 *
 * Use crypto.createHash() to create a Hash object with the appropriate
 * algorithm.
 *
 * Use hash.update() to add the data from val to the Hash, hash.digest() to
 * calculate the digest of the data.
 *
 * Use setTimeout() to prevent blocking on a long operation. Return a Promise to
 * give it a familiar interface.
 *
 */

const crypto = require('crypto')

const hashNode = val =>
  new Promise(resolve =>
    setTimeout(
      () => resolve(crypto.createHash('sha256').update(val).digest('hex')),
      0
    )
  )