我正在调试GULP文件中的一个错误。我似乎不知道应该更改什么。错误如下：
将自动前缀浏览器选项替换为Browserslist配置请使用package.json或.browserslistrc文件中browserslist键
使用浏览器选项会导致一些错误。浏览器列表配置可用于Babel、自动前缀器、postcss-normalize和其他工具。
如果确实需要使用该选项，请将其重命名为overrideBrowserslist。
如欲了解更多信息，请访问：https://github.com/browserslist/browserslist#readme：
[12：20：01]以下任务未完成：default，compile-scss [12：20：01]您是否忘记发出异步完成信号？

var gulp = require('gulp');

// Include plugins
var path = require('path');
var sass = require('gulp-sass');
var postcss = require('gulp-postcss');
var autoprefixer = require('autoprefixer');
var concat = require('gulp-concat');
var uglify = require('gulp-uglify');
var cleanCSS = require('gulp-clean-css');
var folders = require('gulp-folders');
var imagemin = require('gulp-imagemin');

// Config
var inputFolders =  'src'
var outputFolders = 'public'
var scssInput =     'styles';
var scssOutput =    'styles'
var jsInput =       'scripts';
var jsOutput =      'scripts';
var mediaInput =    'images';
var mediaOutput =   'images';
var backupImageFolder = 'backup-image';

// compile scss into css
gulp.task('compile-scss', folders(inputFolders, function (folder) {
  var processors = [
    autoprefixer({browsers: ['last 2 versions', 'IE 10', 'Safari 8']})
  ];
  return gulp.src(inputFolders + '/' + folder + '/' + scssInput  + '/*.scss')
    .pipe(sass().on('error', sass.logError))
    .pipe(postcss(processors))
    .pipe(cleanCSS({compatibility:'*'}))
    .pipe(gulp.dest(outputFolders + '/' + folder + '/' + scssOutput));
}));

// concatenate and minify js
gulp.task('scripts', folders(inputFolders, function(folder) {
  return gulp.src(inputFolders + '/' + folder + '/' + jsInput + '/*.js')
    // .pipe(concat('scripts.js'))
    .pipe(uglify())
    .pipe(gulp.dest(outputFolders + '/' + folder + '/' + jsOutput));
}));

// deploy any media and losslessly optimise if possible
gulp.task('media', folders(inputFolders, function(folder) {
  return gulp.src([inputFolders + '/' + folder + '/' + mediaInput + '/*', inputFolders + '/' + folder + '/' + mediaInput + '/**/*'])
    .pipe(imagemin())
    .pipe(gulp.dest(outputFolders + '/' + folder + '/' + mediaOutput));
}));

// copy across html
gulp.task('html', folders(inputFolders, function(folder) {
  return gulp.src(inputFolders + '/' + folder + '/*.html')
    .pipe(gulp.dest(outputFolders + '/' + folder))
}));

// copy across back-up image for the banner
gulp.task('copy-backup-image', folders(inputFolders, function(folder) {
  return gulp.src(inputFolders + '/' + folder + '/' + backupImageFolder + '/*' )
  .pipe(gulp.dest(outputFolders + '/' + folder + '/' + backupImageFolder))
}));

// Watch files for changes, run affected tasks
gulp.task('watch', function() {
  gulp.watch([inputFolders + '/*/' + scssInput + '/*.scss'], gulp.series('compile-scss'));
  gulp.watch([inputFolders + '/*/' + scssInput + '/**/*.scss'], gulp.series('compile-scss'));
  gulp.watch([inputFolders + '/*/' + jsInput + '/*.js'], gulp.series('scripts'));
  gulp.watch([inputFolders + '/*/' + mediaInput + '/*'], gulp.series('media'));
  gulp.watch([inputFolders + '/*/' + mediaInput + '/**/*'], gulp.series('media'));
  gulp.watch([inputFolders + '/*/*.html'],  gulp.series('html'));
  gulp.watch([inputFolders + '/*/' + backupImageFolder + '/*'],  gulp.series('copy-backup-image'));
});

// Default task
gulp.task('default', 
gulp.series(gulp.parallel('compile-scss', 'scripts', 'media', 'html', 'copy-backup-image'), 'watch'));