Function firstLineOf

src/utils/stringUtils.ts:44–47

(s: string)

 * Used for shebang detection in diff rendering.
 */
export function firstLineOf(s: string): string {
  const nl = s.indexOf('\n')
  return nl === -1 ? s : s.slice(0, nl)
}

/**
 * Counts occurrences of `char` in `str` using indexOf jumps instead of