How to configure gulp-less?

Question

Less

src:

• img
• js
• less
  • block
    • block1.less
    • bliock2.less
  • mixin
    • reset.less
    • clearfix.less

bld

• - css
• -img
• -js

How to correctly build less files that are located in the less/blocks folder and still have imports in the syntax ( import "../mixin/reset" ) in bld/css/main.css?
I did the js minification, I also compiled a sprite, but a question arose with the loess. Attached is gulpfile.js
gulp.task('compressImg', function() {
gulp.src('./src/img/before')
.pipe(imagemin({
optimizationLevel: 8,
progressive: true,
interlaced: true
}))
.pipe(size({
title: 'size of images'
}))
.pipe(gulp.dest('./src/img/after'));
});
gulp.task('sprite',
gulp.src('./src/img/before/*')
.pipe( spritesmith({
imgName: 'sprite.png',
cssName: 'sprite.less',
cssFormat: 'less',
algorithm: 'binary-tree ',
cssTemplate: 'src/mustache/less.template.mustache',
cssVarMap: function(sprite) {
sprite.name = 's-' + sprite.name
}
})
);
spriteData.img
.pipe(gulp.dest(paths.bldImg));
spriteData.css
.pipe(gulp.dest(paths.srcLess));
});
gulp.task('script', function() {
gulp.src(paths.script)
.pipe(concat('script.js'))
.pipe(rename('script.min.js'))
.pipe(uglify())
.pipe(gulp.dest(paths.bldJs));
});
gulp.task('less', function () {
gulp.src('./src/less/**/*.less')
.pipe(less())
.pipe(gulp.dest('./bld/ css'));
});

Answer 1

.....
var concat = require('gulp-concat'),  // объединяет файлы в один бандл
   minifyCSS = require('gulp-minify-css'),  // сжимает, оптимизирует
   rename = require("gulp-rename");  // переименовывает
....
gulp.task('less', function () {
gulp.src('./src/less/**/*.less')
.pipe(less())
.pipe(concat('common.css'))
.pipe(minifyCSS())   
.pipe(rename({suffix: ".min"}))
.pipe(gulp.dest('./bld/css'));
});

Something like this.
ps If the sequence of files when merging is important, see another plugin: "gulp-order" in the gulp-repository

Answer 2

You are missing one step. You need to either create another file with block imports and build it in css, or build each file separately and then merge them into one. Which one is more convenient for you - choose for yourself.