Question

我在VS2017中进行了基本的安装以减少我的Javascript。我决定添加gulp-sass（我的package.json说我在gulp-sass v4.0.1上），但它抛出此错误：

C:\Work\MyProject\MyProject\node_modules\gulp-sass\index.js:66
    let sassMap;
    ^^^
SyntaxError: Block-scoped declarations (let, const, function, class) not yet supported outside strict mode
    at exports.runInThisContext (vm.js:53:16)
    at Module._compile (module.js:373:25)
    at Object.Module._extensions..js (module.js:404:10)
    at Module.load (module.js:343:32)
    at Function.Module._load (module.js:300:12)
    at Module.require (module.js:353:17)
    at require (internal/module.js:12:17)
    at Object.<anonymous> (C:\Work\MyProject\MyProject\gulpfile.js:11:12)
    at Module._compile (module.js:397:26)
    at Object.Module._extensions..js (module.js:404:10)

我的gulpfile看起来像这样：

var gulp = require('gulp');
var concat = require('gulp-concat');
var rename = require('gulp-rename');
var watch = require('gulp-watch');
var uglify = require('gulp-uglify');
var sass = require('gulp-sass');

gulp.task('minify', function () {
    gulp.src('src/**/*.js')
        .pipe(uglify({ mangle: false }))
        .pipe(concat('scripts.min.js'))
        .pipe(gulp.dest('Content'));


});

gulp.task('sass', function () {
    gulp.src('src/css/**/*.scss')
        .pipe(sass({ outputStyle: 'compressed' }))
        .pipe(gulp.dest('Content'));
});

gulp.task('watch', function () {
    gulp.watch('src/**/*.js', ['minify']);
});

我做了一些谷歌搜索，建议的一个简单修复是在有问题的文件的顶部添加“ use strict”，在本例中为index.js：66。但是，这样做之后，我得到：

Failed to run "C:\Work\MyProject\MyProject\Gulpfile.js"...
cmd.exe /c gulp --tasks-simple
C:\Work\MyProject\MyProject\node_modules\node-sass\lib\binding.js:15
      throw new Error(errors.missingBinary());
      ^
Error: Missing binding C:\Work\MyProject\MyProject\node_modules\node-sass\vendor\win32-x64-47\binding.node
Node Sass could not find a binding for your current environment: Windows 64-bit with Node.js 5.x
Found bindings for the following environments:
  - Windows 64-bit with Node.js 6.x
This usually happens because your environment has changed since running `npm install`.
Run `npm rebuild node-sass --force` to build the binding for your current environment.
    at module.exports (C:\Work\MyProject\MyProject\node_modules\node-sass\lib\binding.js:15:13)
    at Object.<anonymous> (C:\Work\MyProject\MyProject\node_modules\node-sass\lib\index.js:14:35)
    at Module._compile (module.js:397:26)
    at Object.Module._extensions..js (module.js:404:10)
    at Module.load (module.js:343:32)
    at Function.Module._load (module.js:300:12)
    at Module.require (module.js:353:17)
    at require (internal/module.js:12:17)
    at Object.<anonymous> (C:\Work\MyProject\MyProject\node_modules\gulp-sass\index.js:163:21)
    at Module._compile (module.js:397:26)

我正在运行Node.js v6。我不知道为什么应该通过一个简单的过程给我这些错误。我在做什么错了？

更新：

我运行了注释中建议的以下命令：

npm install node-sass -f
npm rebuild nose-sass

两者都成功运行。但是，我仍然收到此错误：

Failed to run "C:\Work\MyProject\MyProject\Gulpfile.js"...
cmd.exe /c gulp --tasks-simple
C:\Work\MyProject\MyProject\node_modules\gulp-sass\index.js:66
    let sassMap;
    ^^^
SyntaxError: Block-scoped declarations (let, const, function, class) not yet supported outside strict mode
    at exports.runInThisContext (vm.js:53:16)
    at Module._compile (module.js:373:25)
    at Object.Module._extensions..js (module.js:404:10)
    at Module.load (module.js:343:32)
    at Function.Module._load (module.js:300:12)
    at Module.require (module.js:353:17)
    at require (internal/module.js:12:17)
    at Object.<anonymous> (C:\Work\MyProject\MyProject\gulpfile.js:8:12)
    at Module._compile (module.js:397:26)
    at Object.Module._extensions..js (module.js:404:10)

更新2：

建议我添加“严格使用”；到我的gulpfile.js的顶部，但是发生相同的错误。这是文件内容：

"use strict";
var gulp = require('gulp');
var sass = require('gulp-sass'); // If I comment this out, I can build

gulp.task('sass', function () {
    gulp.src('src/css/**/*.scss')
        .pipe(sass({ outputStyle: 'compressed' }))
        .pipe(gulp.dest('Content'));
});