webpack use sass-load import bootstrap.scss

[Eaglemyoung]

I use webpack5 with sass-loader10 , vue2 and bootstrap5.
but webpack5 can't bundle up.
webpack5 error message.

ERROR in ./node_modules/bootstrap/scss/bootstrap.scss (./node_modules/css-loader/dist/cjs.js!./node_modules/sass-loader/dist/cjs.js??clonedRuleSet-2[0].rules[0].use[3]!./node_modules/bootstrap/scss/bootstrap.scss)
Module build failed (from ./node_modules/sass-loader/dist/cjs.js):
SassError: semicolons aren't allowed in the indented syntax.
   ╷
10 │ @import "functions";
   │                    ^
   ╵
  node_modules/bootstrap/scss/bootstrap.scss 10:20  root stylesheet
 @ ./node_modules/style-loader/dist/cjs.js!./node_modules/css-loader/dist/cjs.js!./node_modules/sass-loader/dist/cjs.js??clonedRuleSet-2[0].rules[0].use[3]!./node_modules/bootstrap/scss/bootstrap.scss 47:4-60:5 2:12-148 9:17-24 13:7-21 45:20-34 49:6-59:7 50:38-52 56:26-40 58:21-28 68:15-29
 @ ./node_modules/bootstrap/scss/bootstrap.scss 4:14-169 14:3-18:5 15:22-177
 @ ./src/main.ts 4:0-34

main.ts

import Vue from 'vue';
import App from './app.vue'
import 'bootstrap'
@import "bootstrap/scss/bootstrap"

Vue.config.productionTip = false;

new Vue({
  render: h => h(App),
}).$mount('#app');

webpack.config.js

const path = require('path')
const MiniCssExtractPlugin = require("mini-css-extract-plugin")
module: {
    rules: [
      {
        test: /\.s[ac]ss$/,
        use: [
          'vue-style-loader',
          devMode ? 'style-loader' : MiniCssExtractPlugin.loader,
          // "style-loader",
          'css-loader',
          // 'postcss-loader',
          {
            loader: 'sass-loader',
            options: {
              sourceMap: true,
              sassOptions: {
                indentedSyntax: true,
                includePaths: [path.resolve(__dirname, 'node_modules')],
                additionalData: "@import '@/styles/variables.scss'"
              }
            }
          }
        ]
      },
      {
        test: /\.css$/,
        use: [
          'vue-style-loader',
          {
            loader: MiniCssExtractPlugin.loader,
            options: {
              publicPath: '../'
            }
          },
          {
            loader: 'css-loader',
            options: {
              importLoaders: 1
            }
          },
          'postcss-loader'
        ]
      },
]
}

how to fix webpack's config or install node-sass?
Thanks