升级node-sass为6.0.1

package.json

@@ -104,7 +104,6 @@
     "gulp": "^4.0.0",
     "gulp-autoprefixer": "^6.0.0",
     "gulp-cssmin": "^0.2.0",
-    "gulp-sass": "^4.0.2",
     "highlight.js": "^9.3.0",
     "html-webpack-plugin": "^3.2.0",
     "json-loader": "^0.5.7",
@@ -124,12 +123,13 @@
     "markdown-it-container": "^2.0.0",
     "mini-css-extract-plugin": "^0.4.1",
     "mocha": "^6.0.2",
-    "node-sass": "^4.11.0",
+    "gulp-sass": "^5.1.0",
+    "node-sass": "^6.0.1",
+    "sass-loader": "^10.2.0",
     "optimize-css-assets-webpack-plugin": "^5.0.1",
     "postcss": "^7.0.14",
     "progress-bar-webpack-plugin": "^1.11.0",
     "rimraf": "^2.5.4",
-    "sass-loader": "^7.1.0",
     "select-version-cli": "^0.0.2",
     "sinon": "^7.2.7",
     "sinon-chai": "^3.3.0",
@@ -146,6 +146,7 @@
     "webpack": "^4.14.0",
     "webpack-cli": "^3.0.8",
     "webpack-dev-server": "^3.1.11",
-    "webpack-node-externals": "^1.7.2"
+    "webpack-node-externals": "^1.7.2",
+    "yarn": "^10.2.0"
   }
 }

packages/theme-chalk/gulpfile.js

@@ -1,13 +1,13 @@
 'use strict';
 
 const { series, src, dest } = require('gulp');
-const sass = require('gulp-sass');
+const sass = require('gulp-sass')(require('node-sass'));
 const autoprefixer = require('gulp-autoprefixer');
 const cssmin = require('gulp-cssmin');
 
 function compile() {
   return src('./src/*.scss')
-    .pipe(sass.sync())
+    .pipe(sass())
     .pipe(autoprefixer({
       browsers: ['ie > 9', 'last 2 versions'],
       cascade: false