codeVerifier property
The code verifier for the PKCE request, Google Cloud CLI originally generates it before the authorization request.
PKCE is used to protect authorization code from interception attacks. See https://www.rfc-editor.org/rfc/rfc7636#section-1.1 and https://www.rfc-editor.org/rfc/rfc7636#section-3. It is required when the flow is authorization code flow, i.e. if grant_type is 'authorization_code'
Optional.
Implementation
core.String? codeVerifier;