wrapper-validation-action/src/hash.ts

import * as crypto from 'crypto'
import * as fs from 'fs'

export async function sha256File(path: string): Promise<string> {
  return new Promise((resolve, reject) => {
    const hash = crypto.createHash('sha256')
    const stream = fs.createReadStream(path)
    stream.on('data', data => hash.update(data))
    stream.on('end', () => {
      stream.destroy()
      resolve(hash.digest('hex'))
    })
    stream.on('error', error => {
      stream.destroy()
      reject(error)
    })
  })
}