httpsProtocol dev certs no longer working as of 9.1.3

[aldenquimby]

Bug Report

Current Behavior

• After upgrading from v8 to the latest v9.1.5, my local build failed with the following error:

TypeError [ERR_INVALID_ARG_TYPE]: The "options.cert" property must be of type string or an instance of Buffer, TypedArray, or DataView. Received an instance of Promise

• Downgrading to v9.1.2 fixes the issue

Sample Code

• file: serverless.yml

  serverless-offline:
    httpsProtocol: 'dev-certs'

Expected behavior/code

• dev server boots without errors

Environment

• serverless version: v3.21.0
• serverless-offline version: v9.1.5
• node.js version: v14.18.18
• OS: macOS

Possible Solution
Consider reverting 7019d28

[dnalborczyk]

thank you for filing the issue @aldenquimby

a fix is on the way, just need to add some tests so it won't break again in the future.

[dnalborczyk]

@aldenquimby could you give v9.1.6 a try? I couldn't get the tests working quickly so I try to add them at a later time. I need to read up more about the usage of the certs and how to make it work.