Function removeExtraLineBreaks

packages/jest-snapshot/src/utils.ts:37–40

(string: string)

// Instead of trim, which can remove additional newlines or spaces
// at beginning or end of the content from a custom serializer.
export const removeExtraLineBreaks = (string: string): string =>
  string.length > 2 && string.startsWith('\n') && string.endsWith('\n')
    ? string.slice(1, -1)
    : string;

export const removeLinesBeforeExternalMatcherTrap = (stack: string): string => {
  const lines = stack.split('\n');