Some tools (e.g., npm) require the credentials to be base64-encoded. Having to manually base64 encode the output of the usernameColonPassword binding is annoying and error prone, since Jenkins does not recognized the base64-encoded version as something to redact.

Please add a usernameColonPasswordBase64 binding that works the same way, except the environment variable will contain the base64-encoded credentials.

For example:

withCredentials([usernameColonPasswordBase64(credentialsId: 'my-id', variable: 'NPM_CONFIG__auth')]) {
   sh 'npm ci'
}