cannot combo

I have got a demo.js node file, some .html files have been put to the src directory

var gulp = require('gulp');
var htmlone = require('gulp-htmlone');

gulp.task('htmlone', function() {
        gulp.src(['./src/*.html'])
                .pipe(htmlone({

        removeSelector: '', // selector 配置，源文档中符合这个selector的标签将自动移除
        keepliveSelector: '',  // 不要combo的selector配置，源文档中符合这个selector的将保持原状
        destDir: './dest',  // dest 目录配置，一般情况下需要和 gulp.dest 目录保持一致，用于修正相对路径资源
        coimport: true,  // 是否需要把 @import 的资源合并
        cssminify: true, // 是否需要压缩css
        jsminify: true  // 是否需要压缩js
}))
                .pipe(gulp.dest('./dest'));
});

run node demo.js but cannot got expected merged files. the dest folder was empty.