Function join

packages/angular_devkit/core/src/virtual-fs/path.ts:110–116

(p1: Path, ...others: string[])

 * normalized as well (but the original must be a path).
 */
export function join(p1: Path, ...others: string[]): Path {
  if (others.length > 0) {
    return normalize((p1 ? p1 + NormalizedSep : '') + others.join(NormalizedSep));
  } else {
    return p1;
  }
}

/**
 * Returns true if a path is absolute.