gulpfile.js

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var gulp = require('gulp'),
    cleanCss = require('gulp-clean-css'),
    less = require('gulp-less'),
    rename = require('gulp-rename'),
    concatCss = require("gulp-concat-css"),
    npmImport = require("less-plugin-npm-import");

const sourceFiles = [
    '**/*.less',
    '!node_modules/**',
    '!**/bin/**',
    '!**/obj/**'
];

gulp.task('isolation', function () {
    return gulp
        .src(sourceFiles)
        .pipe(less({
            javascriptEnabled: true,
            plugins: [new npmImport({ prefix: '~' })]
        }))
        .pipe(rename(function (file) {
            if (file.basename == 'global') {
                file.dirname = 'css';
                file.basename = 'site';
            }
        }))
        .pipe(gulp.dest(function (file) {
            if (file.basename == 'site.css') {
                return 'Client/Gardener.Client.Entry/wwwroot';
            }
            return '.';
        }));
});

gulp.task('less', function () {
    return gulp
        .src(sourceFiles)
        .pipe(less({
            javascriptEnabled: true,
            plugins: [new npmImport({ prefix: '~' })]
        }))
        .pipe(concatCss('site.css'))
        .pipe(cleanCss({ compatibility: '*' }))
        .pipe(gulp.dest('wwwroot/css'));
});

gulp.task('default', gulp.parallel('isolation'), function () {
});