message: fix(migrations): normalize paths to posix
  Both TypeScript and Angular Schematic rely on posix system paths which can cause issues on Windows if paths are not normalized correctly.
  Such as `sourceFile.fileName.startsWith(pathToMigrate)` on Windows will always return falsey.
  PR Close
diff: @@ -29,6 +29,8 @@ interface Options {
  mode: MigrationMode;
  }
  +const normalizePath = (path: string): string => path.replace(/\\/g, '/');
  +
  export default function(options: Options): Rule {
  return async (tree) => {
  const {buildPaths, testPaths} = await getProjectTsConfigPaths(tree);
  @@ -59,7 +61,11 @@ function standaloneMigration(tree: Tree, tsconfigPath: string, basePath: string,
  options: {_enableTemplateTypeChecker: true, compileNonExportedClasses: true}
  }) as NgtscProgram;
  const printer = ts.createPrinter();
  - const pathToMigrate = join(basePath, options.path);
  +
  + // TS and Schematic use paths in POSIX format even on Windows.
  + // This is needed as otherwise string matching such as
  + // `sourceFile.fileName.startsWith(pathToMigrate)` will not work correctly.
  + const pathToMigrate = normalizePath(join(basePath, options.path));
  if (existsSync(pathToMigrate) && !statSync(pathToMigrate).isDirectory()) {
  throw new SchematicsException(`Migration path ${
  