Exception thrown when registering before save hook on MacOS

[limouren]

Consider this hook registration:

skygearCloud.beforeSave('record', () => {
  console.log('beforeSave')
})

skygear-node would fail to start on MacOS. Related portion of stack trace:

(node:27631) UnhandledPromiseRejectionWarning: Error: Digest method not supported
    at new Hash (internal/crypto/hash.js:35:19)
    at Object.createHash (crypto.js:100:10)
    at funcName (/Users/limouren/myproject/node_modules/skygear-core/dist/cloud/index.js:187:33)
    at Object.beforeSave (/Users/limouren/myproject/node_modules/skygear-core/dist/cloud/index.js:563:14)

Line in concern

skygear-SDK-JS/packages/skygear-core/lib/cloud/index.js

Line 43 in c1a1790

const hash = crypto.createHash('sha');

Possible related issue: nodejs/node#17590

• Skygear SDK Date/Version:
• JS runtime:
• Skygear Server Date/Version:
• Is this a regression?
• Attached logs, screenshots

Expected Results

beforeSave registered successfully.

Actual Results

Stated in description.

Steps to reproduce

Stated in description.