如何使用 Grunt 为 LESS 配置 sourceMap？

我正在使用 grunt 0.4.2 和 grunt-contrib-less 0.9.0。我希望将我的 LESS 编译成 CSS，并支持源映射。

我的 LESS 文件位于public/less，主要的称为main.less.

的编译public/less/main.less into public/css/main.css有效，但源映射不起作用。

下面我的 Grunt 配置有什么问题？

{
    less: {
        dev: {
            options: {
                compress: true,
                yuicompress: true,
                optimization: 2,
                sourceMap: true,
                sourceMapFilename: "public/css/main.css.source-map.json", //Write the source map to a separate file with the given filename.
                sourceMapBasepath: "public/less", //Sets the base path for the Less file paths in the source map.
                sourceMapRootpath: "/"//Adds this path onto the Less file paths in the source map.
            },
            files: {
                "public/css/main.css": "public/less/main.less"
            }
        }
    },
    watch: {
        styles: {
            files: ["public/less/*"],
            tasks: ['less'],
            options: {
                livereload: true,
                nospaces: true
            }
        }
    }
}

我不想在我的/public/less文件夹;我想把它放进去/public/css。否则，我可以使用其他配置，它可以工作：

{
    less: {
        dev: {
            options: {
                compress: true,
                yuicompress: true,
                optimization: 2,
                sourceMap: true,
                sourceMapFilename: "public/less/main.css.map", //I DO NOT WANT THE CSS MAP HERE
                sourceMapBasepath: "public/less", //Sets the base path for the Less file paths in the source map.
            },
            files: {
                "public/less/main.css": "public/less/main.less"//I DO NOT WANT THE CSS HERE
            }
        }
    },
    watch: {
        styles: {
            files: ["public/less/*"],
            tasks: ['less'],
            options: {
                livereload: true,
                nospaces: true
            }
        }
    }
}

我发现 LESS 站点文档对于 grunt-contrib-less 使用的参数更加清晰。

LESS：命令行用法 http://lesscss.org/usage/#command-line-usage-installing-lessc http://lesscss.org/usage/#command-line-usage-installing-lessc

NPM：无 grunt-contrib https://www.npmjs.org/package/grunt-contrib-less https://www.npmjs.org/package/grunt-contrib-less

文件结构：

laravel/gruntfile.js
laravel/public/less/main.less
laravel/public/css/main.css
laravel/public/css/main.css.map

文件“main.css.map”注释：

• 如果您愿意，可以重命名为：main.css.source-map.json
• 我猜您有一些服务器规则设置无法从“css”文件夹中正确处理 *.map 文件

压缩注意事项：

• cleancss: true = 将从 main.css 中删除 sourceMappingURL 注释
• yuicompress: true = 不会从 main.css 中删除 sourceMappingURL 注释

Gruntfile.js

less: {
    dev: {
        options: {
            compress: true,
            yuicompress: true,
            optimization: 2,
            sourceMap: true,
            sourceMapFilename: 'public/css/main.css.map', // where file is generated and located
            sourceMapURL: '/css/main.css.map', // the complete url and filename put in the compiled css file
            sourceMapBasepath: 'public', // Sets sourcemap base path, defaults to current working directory.
            sourceMapRootpath: '/', // adds this path onto the sourcemap filename and less file paths
        },
        files: {
            'public/css/main.css': 'public/less/main.less',
        }
    }
},

watch: {
    styles: {
        files: ["public/less/*"],
        tasks: ['less'],
        options: {
            livereload: true,
            nospaces: true
        }
    }
},

laravel/public/css/main.css

.class{ compiled css here } /*# sourceMappingURL=/css/main.css.map */

laravel/public/css/main.css.map

{"version":3,"sources":["/less/main.less"], etc...