Function relative

packages/jest-haste-map/src/lib/fast_path.ts:11–15

(rootDir: string, filename: string)

// rootDir and filename must be absolute paths (resolved)
export function relative(rootDir: string, filename: string): string {
  return filename.startsWith(rootDir + path.sep)
    ? filename.slice(rootDir.length + 1)
    : path.relative(rootDir, filename);
}

const INDIRECTION_FRAGMENT = `..${path.sep}`;