javascript - 与普通 'gulp less' 命令相比，“Gulp watch”事件需要双倍的编译时间

Question

我的 Gulp“watch”less 函数存在问题，因为与单个 less 函数相比，编译 less 文件所需的时间是原来的 2 倍。

当我使用“gulp less”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”，然后更改文件来触发 watch 功能时，与“gulp less”相比，它花费的时间大约是“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“paths.json”，因为我有 5 个不同的主题(这个问题的名称已更改)，因此正在使用的 less 文件需要输出到相关文件夹中这就是我使用函数“updateDestFolder”的原因。

导入 less 的方式是，基本主题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']);
});

路径.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/",
  }
}

如果有人可以建议对确定目标文件夹进行任何改进，而无需使用该功能，我也将不胜感激。

谢谢

Answer 1

我不知道为什么需要更多时间，但以下是如何更好地确定目标文件夹的方法:

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