Credentials path fails to expand tilde to home directory on Windows.

[JadenH]

References: nodejs/node#684
Node Version: 9.5.0

googleProvider.js

let credentials = this.serverless.service.provider.credentials;
const credParts = credentials.split(path.sep);

if (credParts[0] === '~') {
  credParts[0] = os.homedir();
  credentials = credParts.reduce((memo, part) => path.join(memo, part), '');
}

const keyFileContent = fs.readFileSync(credentials).toString();
const key = JSON.parse(keyFileContent);

credentials.split(path.sep) does not appear to be splitting the path as expected.

C:\> node --version
v9.5.0
C:\> node
> let credentials = "~/.gcloud/keyfile.json"
undefined
> const credParts = credentials.split(path.sep);
undefined
> credParts
[ '~/.gcloud/keyfile.json' ]
> credParts[0]
'~/.gcloud/keyfile.json'
> const keyFileContent = fs.readFileSync(credentials).toString();
Error: ENOENT: no such file or directory, open 'C:\~\.gcloud\keyfile.json'
    at Object.fs.openSync (fs.js:663:18)
    at Object.fs.readFileSync (fs.js:568:33)

[aaronkchsu]

YA this would be super nice to look into.. because it is causing me a lot of problems!

[dobromyslov]

This occurs because path.sep is \ when Node.js is running on Windows.
You have to change path separator in your credentials "~/.gcloud/keyfile.json" from / to windows-style \ like below.

serverless.yml:

provider:
  name: google
  ...
  #credentials: ~/.gcloud/keyfile.json # Unix-style path
  credentials: ~\.gcloud\keyfile.json