Gulp not seeing php index file on local server?

Question

gulp.js

This is how the working directory on the local server looks like:
abyss.dev ↓
app ↓
css
js
img
index.php

gulpfile.js:

const { src, dest, parallel, series, watch } = require('gulp');
const browserSync = require('browser-sync').create();
const concat = require('gulp-concat');
const uglify = require('gulp-uglify-es').default;


function browsersync() {
  browserSync.init({
    proxy: 'localhost/abyss.dev/app/',
    notify: false,
    online: true
  });
}

function scripts() {
  return src([
      'node_modules/jquery/dist/jquery.min.js',
      'app/js/main.js'
    ])
    .pipe(concat('./main.min.js'))
    .pipe(uglify())
    .pipe(dest('app/js/'))
    .pipe(browserSync.stream())
}

function startwatch() {
  watch('app/**/*.css').on('change', browserSync.reload);
  watch(['app/**/*.js', '!./app/**/*.min.js'], scripts);
  watch('app/**/*.php').on('change', browserSync.reload);
}
exports.browsersync = browsersync;
exports.scripts = scripts;
exports.default = parallel(scripts, browsersync, startwatch);

I run gulp, instead of the contents of index.php, the structure of the working directory opens in the browser ...) I supplement the proxy line: 'localhost/abyss.dev/app/index.php', the contents of the index are included in the monitor, but after editing the file, browsersync does not see it, I restart the browser with my hands, the changes become. Nuance: git bash fixes the changes. I suspect the error is probably in the proxy line. What do I need to write in it, how to do it right? Please understand.
Ps local server Abyss, win 10, google chrome browser.