Gulp.js 在 LESS 文件出现错误后停止编译 LESS

Gulp.js stops compiling LESS when watched after there has been an error in the LESS files

我遇到了 gulp 的问题。我 运行 gulp-watch 以及 gulp-lessgulp-clean。一切都运行宁完美。

当我编辑 somefile.less 并保存它时缺少分号,或者我可能不小心留下了尾随 ;s,保存时我的代码出现错误,gulp-less在控制台中记录错误。在我修复它后 gulp-watch 继续观察文件,但是 gulp-less 没有触发也没有编译。当我在终端再次停止 gulp 和 运行 时,一切恢复正常。

这是我的 gulpfile.js:

var gulp = require('gulp');
var clean = require('gulp-clean');
var gutil = require('gulp-util');
var less = require('gulp-less');
var watch = require('gulp-watch');
var path = require('path');

gulp.task('clean', function() {
    return gulp.src('src/main/webapp/styles/build', {read: false})
   .pipe(clean().on('error', gutil.log))
});

gulp.task('less', function() {
    return gulp.src(['src/main/webapp/styles/main.less'], {base: 'src/main/webapp/styles/'})
    .pipe(less().on('error', gutil.log))
    .pipe(gulp.dest('src/main/webapp/styles/build'))
    .on('error', gutil.log);
});

gulp.task('watch', function() {
    watch('src/main/webapp/styles/**/*.{less, css}', function() {
        gulp.start('less')
        .on('error', gutil.log);
    })
});

gulp.task('default', ['clean'], function() {
    gulp.start(['less', 'watch'])
    .on('error', gutil.log);
});

这是我的 devDependencies:

"devDependencies": {
    "gulp": "^3.8.10",
    "gulp-clean": "^0.3.1",
    "gulp-less": "^2.0.1",
    "gulp-util": "^3.0.2",
    "gulp-watch": "^3.0.0"
}

最后,这是控制台中的消息:

[10:21:03] imports/productSearchPage.less was changed
[10:21:03] Starting 'less'...
[10:21:03] { [Error: Unrecognised input. Possibly missing something in file /src/main/webapp/styles/imports/productSearchPage.less line no. 1008]
  type: 'Parse',
  filename: '/src/main/webapp/styles/imports/productSearchPage.less',
  index: 19127,
  line: 1008,
  callLine: NaN,
  callExtract: undefined,
  column: 0,
  extract: [ '', '', undefined ],
  message: 'Unrecognised input. Possibly missing something in file /src/main/webapp/styles/imports/productSearchPage.less line no. 1008',
  stack: undefined,
  lineNumber: 1008,
  fileName: '/src/main/webapp/styles/imports/productSearchPage.less',
  name: 'Error',
  showStack: false,
  showProperties: true,
  plugin: 'gulp-less',
  __safety: { toString: [Function] } }
[10:21:04] imports/productSearchPage.less was changed
[10:21:08] imports/productSearchPage.less was changed
^C

能否请您告诉我 gulp-watch 任务有什么问题,并帮助我在消除错误后 运行 gulp-less 完成它,而无需重新启动 gulp .

编辑: 我编辑的 gulp-less 任务

gulp.task('less', function() {
    return gulp.src(['src/main/webapp/styles/main.less'], {base: 'src/main/webapp/styles/'})
    .pipe(less().on('error', gutil.log))
    .pipe(gulp.dest('src/main/webapp/styles/build'))
    .on('error', function(err) {
        gutil.log(err);
        this.emit('end');
    });
});

我刚刚为我自己的个人项目设置了这个。根据 Gulp docs,你可以只使用 gulp.watch:

gulp.task('watch', function() {
    gulp.watch('src/main/webapp/styles/**/*.{less, css}', ['less'])
        .on('error', gutil.log);
});

编辑:如果这没有帮助,请将您的 less 任务更改为:

gulp.task('less', function() {
    return gulp.src(['src/main/webapp/styles/main.less'], {base: 'src/main/webapp/styles/'})
    .pipe(less())
    .on('error', function (err) {
        gutil.log(err);
        this.emit('end');
    })
    .pipe(gulp.dest('src/main/webapp/styles/build'))
    .on('error', gutil.log);
});

改编自this comment

我总是使用 gulp-plumber 来捕获错误。工作起来非常容易,并将错误记录到控制台。

示例:

gulp.task('less', function() {
    return gulp.src(['src/main/webapp/styles/main.less'], {base: 'src/main/webapp/styles/'})
    .pipe(plumber())
    .pipe(less().on('error', gutil.log))
    .pipe(gulp.dest('src/main/webapp/styles/build'))
    .on('error', function(err) {
        gutil.log(err);
        this.emit('end');
    });
});

现在可以用了!这是我的最终工作 gulp-less 任务:

gulp.task('less', function() {
    return gulp.src(['src/main/webapp/styles/main.less'], {base: 'src/main/webapp/styles/'})
    .pipe(less().on('error', function(err){
        gutil.log(err);
        this.emit('end');
    }))
    .pipe(gulp.dest('src/main/webapp/styles/build'))
});

问题是,当 LESS 中出现错误时,任务仍在继续并构建目标文件。最重要的是,我放置了错误记录函数和 emit('end') 作为对 gulp.dest.

的回调

现在,当 less() 的回调是错误日志并且 emit('end') 一切正常时。

我尝试过的最好的解决方案; https://github.com/gulpjs/gulp/blob/master/docs/recipes/combining-streams-to-handle-errors.md

var combiner = require('stream-combiner2');
gulp.task('multi:less', function(done) {
    var combined = combiner.obj([
        gulp.src(srcs),
        less(),
        autoprefixer({
            browsers: ['last 6 versions'],
            cascade: false
        }),
        isDev ? null : cleanCss(),
        gulp.dest(targetDir + 'css/multi/'),
    ].filter(v => v));

    // any errors in the above streams will get caught
    // by this listener, instead of being thrown:
    combined.on('error', console.error.bind(console));
    combined.on('end', () => {}); //done have been call when return combined;
    return combined;

}