浏览器列表和gulp 4的同步完成问题

Question

我正在尝试调试GULP文件中的错误。我似乎无法弄清楚应该改变什么。错误如下：

将Autoprefixer浏览器选项替换为Browserslist配置。使用package.json或.browserslistrc文件中的browserslist键。

使用浏览器选项会导致某些错误。浏览器列表配置可以用于Babel，Autoprefixer，postcss-normalize和其他工具。

如果确实需要使用选项，请将其重命名为overrideBrowserslist。

了解更多信息：https://github.com/browserslist/browserslist#readmehttps://twitter.com/browserslist

[[12:20:01]以下任务未完成：默认，compile-scss[12:20:01]您是否忘记了异步完成信号？

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'));

Answer 1

在工作根目录或工作区目录中添加一个.browserslistrc，其中包含类似以下内容：

# Browsers that we support

last 2 versions
IE 10
Safari 8

然后更改此代码：

var processors = [
    autoprefixer({browsers: ['last 2 versions', 'IE 10', 'Safari 8']})
  ];

简单地说：

var processors = [
    autoprefixer()
  ];

这应该消除对browsers选项的抱怨。然后运行您的default任务以查看是否修复了您的'compile-scss'无法完成错误消息并报告的情况。

---

现在用于异步信号问题。该gulp-folders插件已经5年没有更新了，因此我建议使用其他方法。

const glob = require('glob');

    // this gets an array of matching folders
const folders = glob.sync(inputFolders');

gulp.task('compile-scss', () => {

  let stream;

  // work on each folder separately
  folders.forEach(function (folder) {

    stream = gulp.src( inputFolders + '/' + folder + '/' + scssInput  + '/*.scss' )

     // do your other stuff

      .pipe(gulp.dest( outputFolders + '/' + folder + '/' + scssOutput ));
  });
  return stream;
});