Почему browser-sync удаляет папку с sourcemaps css файлов?

Question

[dqwe93]

С помощью gulp настроил автоматическое применение стилей на странице при изменении sass файлов. Но почему-то при первом запуске gulp в исходном коде указывается правильный путь до файла с кодом

при изменении block.scss путь меняется и удаляется папка, где лежат sourcemaps


Структура проекта


Код gulpfile.js
c

onst { notify } = require('browser-sync');
const { src, dest, parallel, series, watch } = require('gulp');

const buildFolder = 'build',
      sourceFolder = 'src';

//const rename       = require('rename');
const sass         = require('gulp-sass'),
      autoprefixer = require('gulp-autoprefixer'),
      cleanCss     = require('gulp-clean-css'),
      rename       = require('gulp-rename'),
      sourceMaps   = require('gulp-sourcemaps'),
      browserSync  = require('browser-sync').create(),
      concat       = require('gulp-concat'),
      uglify       = require('gulp-uglify-es').default,
      strip        = require('gulp-strip-comments'),
      imagemin     = require('gulp-imagemin'),
      newer        = require('gulp-newer'),
      include      = require('gulp-include'),
      ttf2woff     = require('gulp-ttf2woff'),
      ttf2woff2    = require('gulp-ttf2woff2'),
      fs           = require('fs'),
      del          = require('del'),
      minify = require('gulp-minify'),
      terser       = require('gulp-terser');

const path = {
  source:{
    html: './pages/*.html',
    scss: sourceFolder + '/scss/style.scss',
    js: sourceFolder + '/js/scripts.js',
    img: sourceFolder + '/img/**/*.{jpg,png,svg,gif,ico,webp}',
    fonts: sourceFolder + '/fonts/**/*.ttf'
  },
  build:{
    html: buildFolder + '/pages/',
    styles: buildFolder + '/' + sourceFolder + '/css/',
    js: buildFolder + '/' + sourceFolder + '/js/',
    img: buildFolder + '/' + sourceFolder + '/img/',
    fonts: buildFolder + '/' + sourceFolder + '/fonts/'
  },
  whatch:{
    html: './pages/*.html',
    styles: sourceFolder + '/scss/**/*.scss',
    js: sourceFolder + '/js/**/*.js',
    img: sourceFolder + '/img/**/*.img',
    fonts: sourceFolder + '/fonts/**/*.ttf'
  }
}

function browser_sync(){
  browserSync.init({
    server: {baseDir: ["build/pages", "build"] },
    files: "*.html",
    online: true
  })
  
}

function html(){
  return src(path.source.html)
  .pipe(dest(path.build.html))
  .pipe(browserSync.stream());
}




function styles(){
  return src(path.source.scss)
    .pipe(sourceMaps.init())
    .pipe(sass({
      errLogToConsole: true
    })).on('error', console.error.bind(console))
    .pipe(autoprefixer())
    .pipe(cleanCss())
    .pipe(rename({
      suffix:'.min'
    }))
    .pipe(sourceMaps.write('map'))
    .pipe(dest(path.build.styles, { sourcemaps: 'map' }),)
    .pipe(browserSync.stream());
}

function stylesbuild(){
  return src(path.source.scss)
  .pipe(sass({
    sourceMap: 'scss',
    errLogToConsole: true
  })).on('error', console.error.bind(console))
  .pipe(autoprefixer())
  .pipe(rename({
    suffix:'.min'
  }))
  .pipe(cleanCss( {level: {1: {specialComments: 0}}}))
  .pipe(dest(path.build.styles))
  .pipe(browserSync.stream());
}

function scripts(){
  return src(path.source.js)
  .pipe(sourceMaps.init())
  .pipe(include())
  .pipe(minify({
    ext:{
      min:'.min.js'
  },
  noSource:true
}
  ))
  .pipe(sourceMaps.write('map'))
  .pipe(dest(path.build.js))
  .pipe(browserSync.stream());
 }

function scriptsbuild(){
  return src(path.source.js)
  .pipe(include())
  .pipe(minify({
    ext:{
      min:'.min.js'
  },
  noSource:true
}
  ))
  .pipe(dest(path.build.js))
  .pipe(browserSync.stream());
}

function images(){
  return src(path.source.img)
  .pipe(newer(path.build.img))
  .pipe(imagemin({
    optimizationLevel: 5
  }))
  .pipe(dest(path.build.img))
}

const fonts = () => {
    src(path.source.fonts)
    .pipe(newer(path.build.fonts))
    .pipe(ttf2woff())
    .pipe(dest(path.build.fonts))
    .pipe(dest(sourceFolder + '/fonts/'))
  return src(path.source.fonts)
		.pipe(ttf2woff2())
    .pipe(dest(path.build.fonts))
    .pipe(dest(sourceFolder + '/fonts/'))
}

const cb = () => {}

let srcFonts = './src/scss/_fonts.scss';
let buildFonts = path.build.fonts;

const fontsstyle = (done) => {
	let file_content = fs.readFileSync(srcFonts);

	fs.writeFile(srcFonts, '', cb);
	fs.readdir(buildFonts, function (err, items) {
		if (items) {
			let c_fontname;
			for (var i = 0; i < items.length; i++) {
				let fontname = items[i].split('.');
				fontname = fontname[0];
				if (c_fontname != fontname) {
					fs.appendFile(srcFonts, '@include font-face("' + fontname + '", "' + fontname + '", 400);\r\n', cb);
				}
				c_fontname = fontname;
			}
		}
	})

	done();
}
//'!'+buildFolder+'/'+sourceFolder+'/src/css/*.min.css'
function startWatch(){
  browser_sync();
  watch(path.whatch.styles, styles); 
  watch([sourceFolder + '/js/**/*.js', '!'+buildFolder+sourceFolder+'/js/scripts.min.js'], scripts);
  watch(path.whatch.html, html);
  watch(path.source.img, images);
  watch(path.whatch.fonts, series(fonts, fontsstyle));
}

function cleanbuild(){
  return del(buildFolder + '/**/*', {force: true});
}

function cleanscripts(){
  return del(path.build.js + 'scripts.js', {force: true});
}

let build = series(cleanbuild, parallel(scripts, styles, images), html, fonts, fontsstyle);

exports.startWatch = startWatch;
exports.browser_sync = browser_sync;
exports.html = html;
exports.styles = styles;
exports.stylesbuild = stylesbuild;
exports.scripts = scripts;
exports.scriptsbuild = scriptsbuild;
exports.images = images;
exports.fonts = fonts;
exports.fontsstyle = fontsstyle;
exports.cleanbuild = cleanbuild; 
exports.default =  series(cleanbuild, parallel(scripts, styles, images, html, fonts), fontsstyle, startWatch);
exports.build = series(cleanbuild, parallel(scriptsbuild, stylesbuild, images, html, fonts), fontsstyle);