Function isWithinBasePath

packages/core/schematics/utils/tsurge/project_paths.ts:128–130

* Whether `path` is a descendant of the `base`? * E.g. `a/b/c` is within `a/b` but not within `a/x`.

(fs: FileSystem, base: AbsoluteFsPath, path: AbsoluteFsPath)

 * E.g. `a/b/c` is within `a/b` but not within `a/x`.
 */
function isWithinBasePath(fs: FileSystem, base: AbsoluteFsPath, path: AbsoluteFsPath): boolean {
  return isLocalRelativePath(fs.relative(base, path));
}