Gulp does not compile SASS to CSS, what should I do?

Question

gulp.js

const gulp          = require('gulp'),
      sass          = require('gulp-sass'),
      browsersync   = require("browser-sync").create();

function browserSync(done) {
  browsersync.init({
    server: {
      baseDir: "src"
    },
    port: 3000,
    notify: false
  });
  done();
}

function gulpSass() {
  return gulp
    .src('src/sass/**/*.sass')
    .pipe(sass({ outputStyle: "expanded" }))
    .pipe(gulp.dest('src/css'))
    .pipe(browsersync.stream())
}

gulp.task('sass', gulpSass);
gulp.task('browser-sync', browserSync);
gulp.task('default', gulp.parallel(browserSync, sass));

Everything, installed correctly, gulp by cmd is included. But with new styles in style.sass , nothing happens in the style.css file? What to do? Also, there is no auto-refresh of the page and the same "BrowserSync Connected"