Language: TypeScript
Label: vulnerable
CWE: CWE-331 \u2014 Insufficient Entropy
The product uses an algorithm or scheme that produces insufficient entropy, leaving patterns or clusters of values that are more likely to occur than others.

Code:
function prepareMessagePayload(modules, messagePayload) {
  const { crypto, config } = modules;
  let stringifiedPayload = JSON.stringify(messagePayload);

  if (config.cipherKey) {
    stringifiedPayload = crypto.encrypt(stringifiedPayload);
    stringifiedPayload = JSON.stringify(stringifiedPayload);
  }

  return stringifiedPayload;
}