Javascript '；狼吞虎咽的手表'；事件所需的编译时间是正常编译时间的两倍；少吞咽'；命令

我的Gulp'watch'less函数有问题，因为编译less文件的时间比单个less函数长2倍

当我使用“少吞咽”时，平均需要9/10秒

[12:57:15] Starting 'less'...
[12:57:25] Finished 'less' after 9.96 s

但是，当我使用“gulp watch less”时，然后更改一个文件以触发watch功能，它所花费的时间大约是“gulp less”的两倍

[13:03:43] Starting 'watch-less'...
[13:03:45] Finished 'watch-less' after 1.31 s
[13:03:48] Starting 'less'...
[13:04:06] Finished 'less' after 18 s

下面是我的gulpfile.js，它引入了“path.json”，因为我有5个不同的主题（这个问题的名称有所改变），所以使用的较少的文件需要输出到相关的文件夹中，这就是为什么我使用函数“updateDestFolder”

导入less的方式是，基础主题中的更改应该更新主题2-5

/*jslint node: true */
'use strict';

// Require the various plugins
var gulp     = require('gulp');
var watch    = require('gulp-watch');
var less     = require('gulp-less');
var plumber = require('gulp-plumber');

// Pull in External Paths JSON
var paths = require('./Config/paths.json');

// Determine output path depending on source path
function updateDestFolder(path) {
    var folder = '';

    if (path.indexOf(paths.themes.baseTheme) > -1) {
        folder = paths.themeDest.baseTheme;
    }
    else if (path.indexOf(paths.themes.theme2) > -1) {
        folder = paths.themeDest.theme2;
    }
    else if (path.indexOf(paths.themes.theme3) > -1) {
        folder = paths.themeDest.theme3;
    }
    else if (path.indexOf(paths.themes.theme4) > -1) {
        folder = paths.themeDest.theme4;
    }
    else if (path.indexOf(paths.themes.theme5) > -1) {
        folder = paths.themeDest.theme5;
    }

    return folder;
}

// Compile LESS
gulp.task('less', function() {
    var completeLessPaths = paths.less.src.concat(paths.less.ignore); // Merges both arrays
    var destFolder;

    return gulp.src(completeLessPaths)
        .pipe(plumber()) // Handle any errors with the plugins
        .pipe(less({
            strictUnits: true,
            compress: true // Minify the style
        }))
        .pipe(gulp.dest(function (file) {
            destFolder = updateDestFolder(file.path);
            return destFolder + 'Styles/';
        }));
});

// Default tasks to run when 'gulp' is ran via command line
gulp.task('default', ['less', 'js', 'image']);

// Watch for changes to less source files, then fire the relevant function
gulp.task('watch-less', function () {
    gulp.watch(paths.less.src, ['less']);
});

path.json：

{
  "less" : {
    "src" : [
      "../Orchard.Web/Themes/Theme1Base/Styles/**/*.less",
      "../Orchard.Web/Themes/Theme2/Styles/**/*.less",
      "../Orchard.Web/Themes/Theme3/Styles/**/*.less",
      "../Orchard.Web/Themes/Theme4/Styles/**/*.less",
      "../Orchard.Web/Themes/Theme5/Styles/**/*.less"
    ],
    "ignore" : [
      "!../**/*.css",
      "!../**/bootstrap-overrides.less",
      "!../**/font-awesome.less",
      "!../**/Imports/**/*.less",
      "!../**/typography*.less",
      "!../**/*variables*.less"
    ]
  },
  "themes" : {
    "baseTheme": "Theme1Base",
    "theme2": "Theme2",
    "theme3": "Theme3",
    "theme4": "Theme4",
    "theme5": "Theme5",
  },
  "themeDest" : {
    "baseTheme" : "../Orchard.Web/Themes/Theme1Base/",
    "theme2" : "../Orchard.Web/Themes/Theme2/",
    "theme3" : "../Orchard.Web/Themes/Theme3/",
    "theme4": "../Orchard.Web/Themes/Theme4/",
    "theme5" : "../Orchard.Web/Themes/Theme5/",
  }
}

如果有人能在不需要使用该功能的情况下对确定dest文件夹提出任何改进建议，我也将不胜感激

---

谢谢

我不知道为什么要花更多的时间，但下面是如何更好地确定dest文件夹：

gulp.dst(function(file) { return file.split("/Styles")[0] + "/Styles/"; });