npm 开始时出错 sass-loader

error while npm start getting error of sass-loader

错误:

ERROR in ./src/assets/scss/styles.scss (./node_modules/@angular-devkit/build-angular/src/angular-cli-files/plugins/raw-css-loader.js!./node_modules/postcss-loader/src??embedded!./node_modules/sass-loader/dist/cjs.js??ref--14-3!./src/assets/scss/styles.scss)
Module build failed (from ./node_modules/sass-loader/dist/cjs.js):

      @for $i from 1 through $grid-row-columns {
                            ^
      Undefined variable: "$grid-row-columns".
      in C:\Users\node_modules\bootstrap\scss\mixins\_grid-framework.scss (line 37, column 30)

package.json

{
    "name": "r",
    "version": "1.2.91-SNAPSHOT",
    "license": "MIT",
    "scripts": {
        "ng": "ng",
        "start": "node --max-old-space-size=8192 node_modules/@angular/cli/bin/ng serve --base-href=/abc/  --disableHostCheck=true",
        "start:dev": "node --max-old-space-size=8192 node_modules/@angular/cli/bin/ng serve --aot --base-href=/abc/ --disableHostCheck=true",
        "build": "webpack",
        "test": "karma start ./karma.conf.js",
        "test:dev": "node --max-old-space-size=8192 node_modules/@angular/cli/bin/ng test  --code-coverage",
        "lint": "ng lint",
        "deploy:dev": "node --max-old-space-size=8192 node_modules/@angular/cli/bin/ng serve --configuration=dev --base-href=/abc/  --disableHostCheck=true",
        "start:webpack": "webpack-dev-server --inline --progress --host 0.0.0.0 --port 4200 --environment prod",
        "e2e": "protractor ./protractor.conf.js",
        "pree2e": "webdriver-manager update --standalone false --gecko false --quiet",
        "bundle-report": "webpack-bundle-analyzer dist/stats.json"
    },
    "private": false,
    "dependencies": {
        "@angular/animations": "^7.2.8",
        "@angular/cdk": "^7.3.4",
        "@angular/common": "^7.2.8",
        "@angular/compiler": "^7.2.8",
        "@angular/core": "^7.2.8",
        "@angular/forms": "^7.2.8",
        "@angular/http": "^7.2.8",
        "@angular/material": "^7.3.4",
        "@angular/platform-browser": "^7.2.8",
        "@angular/platform-browser-dynamic": "^7.2.8",
        "@angular/router": "^7.2.8",
        "@babel/polyfill": "^7.2.3",
        "@ng-bootstrap/ng-bootstrap": "^4.1.0",
        "@ng-idle/core": "^7.0.0-beta.1",
        "@ng-idle/keepalive": "^7.0.0-beta.1",
        "@ngrx/entity": "7.0.0",
        "@ngrx/store": "7.0.0",
        "@ngrx/store-devtools": "7.0.0",
        "@ngx-translate/core": "^11.0.1",
        "@ngx-translate/http-loader": "^4.0.0",
        "@swimlane/ngx-datatable": "14.0.0",
        "angular-font-awesome": "^3.1.2",
        "angular-particle": "^1.0.4",
        "angular2-hotkeys": "^2.1.4",
        "angular2-jwt": "^0.2.3",
        "angular2-moment": "^1.8.0",
        "apollo-angular": "1.5.0",
        "apollo-angular-link-http": "^1.4.0",
        "apollo-cache-inmemory": "^1.5.1",
        "apollo-client": "^2.5.1",
        "apollo-link": "^1.2.9",
        "apollo-link-error": "^1.1.8",
        "bootstrap": "^4.4.1",
        "classlist.js": "^1.1.20150312",
        "core-js": "^2.6.5",
        "electron-to-chromium": "^1.3.134",
        "font-awesome": "^4.7.0",
        "graphql": "^14.1.1",
        "graphql-tag": "^2.10.1",
        "igniteui-angular": "5.2.0-beta.0",
        "jwt-decode": "^2.2.0",
        "ng2-cookies": "1.0.12",
        "ng2-trim-directive": "^2.1.2",
        "ng2-validation": "^4.2.0",
        "ngx-pagination": "^3.2.1",
        "ngx-perfect-scrollbar": "^7.1.0",
        "ngx-slick-carousel": "^0.4.4",
        "ngx-snackbar": "^2.0.1",
        "particles.js": "^2.0.0",
        "primeng": "^7.0.5",
        "rxjs": "^6.5.1",
        "serve": "^10.1.2",
        "slick-carousel": "^1.8.1",
        "stickyfill": "^1.1.1",
        "sweetalert2": "^7.22.2",
        "tslib": "^1.9.0",
        "unsubscribe-all": "1.4.0",
        "web-animations-js": "^2.1.5",
        "zone.js": "^0.8.29"
    },
    "devDependencies": {
        "@angular-devkit/build-angular": "^0.13.9",
        "@angular-devkit/core": "^7.3.5",
        "@angular/cli": "^7.3.5",
        "@angular/compiler-cli": "^7.2.8",
        "@angular/language-service": "^7.2.8",
        "@types/jasmine": "^3.3.8",
        "@types/jasminewd2": "^2.0.2",
        "@types/lodash": "^4.14.122",
        "@types/node": "^10.12.30",
        "@types/uuid": "^3.4.4",
        "autoprefixer": "^9.4.10",
        "circular-dependency-plugin": "^5.0.2",
        "codelyzer": "^4.0.1",
        "copy-webpack-plugin": "^4.6.0",
        "extract-text-webpack-plugin": "^3.0.2",
        "file-loader": "^3.0.1",
        "html-loader": "^0.5.5",
        "html-webpack-plugin": "^3.2.0",
        "istanbul-instrumenter-loader": "^3.0.0",
        "jasmine-core": "^3.3.0",
        "jasmine-spec-reporter": "^4.2.1",
        "jquery": "^3.4.1",
        "karma": "^4.0.0",
        "karma-chrome-launcher": "^2.2.0",
        "karma-coverage-istanbul-reporter": "^2.0.5",
        "karma-firefox-launcher": "^1.1.0",
        "karma-jasmine": "^2.0.1",
        "karma-jasmine-html-reporter": "^1.4.0",
        "karma-parallel": "^0.3.1",
        "karma-phantomjs-launcher": "^1.0.4",
        "less-loader": "^4.0.5",
        "ngx-bootstrap": "^4.1.0",
        "postcss-import": "^12.0.1",
        "postcss-url": "^8.0.0",
        "protractor": "^5.4.1",
        "raw-loader": "^1.0.0",
        "sonarqube-scanner": "^2.4.0",
        "specgen": "^1.3.1",
        "style-loader": "^0.23.1",
        "stylus-loader": "^3.0.1",
        "ts-node": "^7.0.1",
        "tslint": "^5.13.1",
        "typescript": "3.2.2",
        "uglifyjs-webpack-plugin": "^2.1.2",
        "url-loader": "^1.1.2",
        "webpack-bundle-analyzer": "^3.3.2",
        "webpack-dev-server": "^3.2.1",
        "webpack-merge": "^4.1.5"
    }
}

不清楚在收到此错误之前您做了什么。请尝试更具体。 至于这个一般性问题,这里是一般性答案:

  1. 检查您是否从正确的位置 运行 npm 安装。这很明显,但总有事情发生。
  2. 确保 运行 npm 从正确的文件夹启动。
  3. 寻找“$grid-row-columns”的定义,我的意思是 _grid-framework.scss 可能会引用定义此变量的其他文件。

祝你好运!

您需要将 bootstrap 降级到 4.3.1 脚步: 1. 删除 bootstrap - npm uninstall bootstrap 2. 安装 Bootstrap 4.3.1 - npm install bootstrap@4.3.1

尝试以下步骤;

尝试 1

npm install node-sass

尝试 2

remove node_modules folder and run npm install

尝试 3

npm rebuild node-sass

尝试 4

npm install --save node-sass