任务运行员添加gulp

我在VS2017中有一个基本的gulp设置来缩小我的Javascript。我决定添加gulp-sass（我的package.json说我在gulp-sass v4.0.1上），但它抛出了这个错误：

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和一个简单的修复建议是在违规文件的顶部添加“use strict”，在这种情况下index.js：66。但是，在这之后，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。我迷失了为什么应该是一个简单的过程给我这些错误。我究竟做错了什么？

更新：

我运行了评论中建议的以下命令：

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

两者都成功了。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：

我被建议添加“使用严格”;到我的gulpfile.js的顶部，但同样的错误发生。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'));
});

最常见的在线问题似乎是Node.js版本<6.0，但我正在运行v6.11.1。

更新3 :(已解决）

我终于找到了原因和解决方案;我已经将它作为下面的答案添加到任何未来的读者。请享用。