When changing the file, gulp gives an error, what's wrong?

Question

Sass

There is an assembly, everything is fine to build, but when I write styles in a Sass file, it sometimes works fine, but sometimes there is an error
. What is my cant?

'use strict';

var gulp = require('gulp'),
    watch = require('gulp-watch'),
    preFixer = require('gulp-autoprefixer'),
    uglify = require('gulp-uglify'),
    sass = require('gulp-sass'),
    sourceMaps = require('gulp-sourcemaps'),
    rigger = require('gulp-rigger'),
    cssMin = require('gulp-minify-css'),
    imagemin = require('gulp-imagemin'),
    pngquant = require('imagemin-pngquant'),
    rimRaf = require('rimraf'),
    browserSync = require('browser-sync'),
    reload = browserSync.reload;


var path = {

  build: {
    html: 'build/',
    js: 'build/js/',
    css: 'build/css/',
    img: 'build/img/',
    fonts: 'build/fonts/'
  },
  src: {
    html: 'src/*.html',
    js: 'src/js/main.js',
    style: 'src/style/main.scss',
    img: 'src/img/**/*.*',
    fonts: 'src/fonts/**/*.*'
  },
  watch: {
    html: 'src/**/*.html',
    js: 'src/js/**/*.js',
    style: 'src/style/**/*.scss',
    img: 'src/img/**/*.*',
    fonts: 'src/fonts/**/*.*'
  },
  clean: '.build/'
};


gulp.task('webserver', function() {
  browserSync({
    server: {
      baseDir: './build'
    },
    host: 'localhost',
    port: 3000,
    tunnel: true
  })
});

gulp.task('html:build', function() {
  gulp.src(path.src.html)
    .pipe(rigger())
    .pipe(gulp.dest(path.build.html))
    .pipe(reload({stream: true}));
});

gulp.task('js:build', function () {
  gulp.src(path.src.js) //Найдем наш main файл
      .pipe(rigger()) //Прогоним через rigger
      .pipe(sourceMaps.init()) //Инициализируем sourcemap
      .pipe(uglify()) //Сожмем наш js
      .pipe(sourceMaps.write()) //Пропишем карты
      .pipe(gulp.dest(path.build.js)) //Выплюнем готовый файл в build
      .pipe(reload({stream: true})); //И перезагрузим сервер
});

gulp.task('style:build', function () {
  gulp.src(path.src.style) //Выберем наш main.scss
      .pipe(sourceMaps.init()) //То же самое что и с js
      .pipe(sass()) //Скомпилируем
      .pipe(preFixer()) //Добавим вендорные префиксы
      .pipe(cssMin()) //Сожмем
      .pipe(sourceMaps.write())
      .pipe(gulp.dest(path.build.css)) //И в build
      .pipe(reload({stream: true}));
});


gulp.task('image:build', function() {
  gulp.src(path.src.img)
    .pipe(imagemin({
      progressive: true,
      svgoPlugins: [{removeViewBox: false}],
      use: [pngquant()],
      interlaced: true
    }))
    .pipe(gulp.dest(path.build.img))
    .pipe(reload({stream: true}))
});

gulp.task('fonts:build', function() {
  gulp.src(path.src.fonts)
      .pipe(gulp.dest(path.build.fonts))
});


gulp.task('build', [
  'html:build',
  'js:build',
  'style:build',
  'fonts:build',
  'image:build'
]);

gulp.task('watch', function(){
  watch([path.watch.html], function(event, cb) {
      gulp.start('html:build');
  });
  watch([path.watch.style], function(event, cb) {
      gulp.start('style:build');
  });
  watch([path.watch.js], function(event, cb) {
      gulp.start('js:build');
  });
  watch([path.watch.img], function(event, cb) {
      gulp.start('image:build');
  });
  watch([path.watch.fonts], function(event, cb) {
      gulp.start('fonts:build');
  });
});

gulp.task('clean', function (cb) {
  rimraf(path.clean, cb);
});

gulp.task('default', ['build', 'webserver', 'watch']);

Answer 1

Additionally, add to each task (more difficult than simple copying) after gulp.src(path.src.img) a pipe like: .pipe($.plumber({ errorHandler : onError
})) you have to restart gulp). Error handler:

const onError = (err) => {
  $.notify.onError({
    title: `Error in ${err.plugin}`,
    message: err.message
  })(err);
  this.emit('end');
};

PS: "$." is in my case the short name of the gulp-load-plugins module . Well, judging by the comments in the config, I took it from the same source.