Function removeBlankErrorLine

packages/jest-message-util/src/index.ts:506–512

(str: string)

const errorRegexp = /^Error:?\s*$/;

const removeBlankErrorLine = (str: string) =>
  str
    .split('\n')
    // Lines saying just `Error:` are useless
    .filter(line => !errorRegexp.test(line))
    .join('\n')
    .trimEnd();

// jasmine and worker farm sometimes don't give us access to the actual
// Error object, so we have to regexp out the message from the stack string