如何从Angular 6或7组件内部的LESS文件访问styles.less中的LESS变量？

Question

Angular版本7.0.0 文件夹结构是运行“ ng new”时得到的

这是我的styles.less文件

@personal-black: #0000;

这是我的app.component.less文件

#personal-style-scheme {
    color: @personal-black;
}

<h1 id="personal-style-scheme">
    Welcome to {{ title }}!
</h1>

我得到的错误是：

  

无法编译。

     

./ src / app / app.component.less模块​​构建失败（来自./node_modules/less-loader/dist/cjs.js）：＃personal-style-scheme {color：@ personal-black; ^在C：\ Users \ Sameer \ Documents \ my-app \ src \ app \ app.component.less（第2行，第11列）中未定义变量@ personal-black

我不明白为什么组件的less文件无法访问较小的@ personal-black变量。

Angular.json文件

{
  "$schema": "./node_modules/@angular/cli/lib/config/schema.json",
  "version": 1,
  "newProjectRoot": "projects",
  "projects": {
    "my-app": {
      "root": "",
      "sourceRoot": "src",
      "projectType": "application",
      "prefix": "app",
      "schematics": {
        "@schematics/angular:component": {
          "styleext": "less"
        }
      },
      "architect": {
        "build": {
          "builder": "@angular-devkit/build-angular:browser",
          "options": {
            "outputPath": "dist/my-app",
            "index": "src/index.html",
            "main": "src/main.ts",
            "polyfills": "src/polyfills.ts",
            "tsConfig": "src/tsconfig.app.json",
            "assets": [
              "src/favicon.ico",
              "src/assets"
            ],
            "styles": [
              "src/styles.less"
            ],
            "scripts": []
          },
          "configurations": {
            "production": {
              "fileReplacements": [
                {
                  "replace": "src/environments/environment.ts",
                  "with": "src/environments/environment.prod.ts"
                }
              ],
              "optimization": true,
              "outputHashing": "all",
              "sourceMap": false,
              "extractCss": true,
              "namedChunks": false,
              "aot": true,
              "extractLicenses": true,
              "vendorChunk": false,
              "buildOptimizer": true,
              "budgets": [
                {
                  "type": "initial",
                  "maximumWarning": "2mb",
                  "maximumError": "5mb"
                }
              ]
            }
          }
        },
        "serve": {
          "builder": "@angular-devkit/build-angular:dev-server",
          "options": {
            "browserTarget": "my-app:build"
          },
          "configurations": {
            "production": {
              "browserTarget": "my-app:build:production"
            }
          }
        },
        "extract-i18n": {
          "builder": "@angular-devkit/build-angular:extract-i18n",
          "options": {
            "browserTarget": "my-app:build"
          }
        },
        "test": {
          "builder": "@angular-devkit/build-angular:karma",
          "options": {
            "main": "src/test.ts",
            "polyfills": "src/polyfills.ts",
            "tsConfig": "src/tsconfig.spec.json",
            "karmaConfig": "src/karma.conf.js",
            "styles": [
              "src/styles.less"
            ],
            "scripts": [],
            "assets": [
              "src/favicon.ico",
              "src/assets"
            ]
          }
        },
        "lint": {
          "builder": "@angular-devkit/build-angular:tslint",
          "options": {
            "tsConfig": [
              "src/tsconfig.app.json",
              "src/tsconfig.spec.json"
            ],
            "exclude": [
              "**/node_modules/**"
            ]
          }
        }
      }
    },
    "my-app-e2e": {
      "root": "e2e/",
      "projectType": "application",
      "prefix": "",
      "architect": {
        "e2e": {
          "builder": "@angular-devkit/build-angular:protractor",
          "options": {
            "protractorConfig": "e2e/protractor.conf.js",
            "devServerTarget": "my-app:serve"
          },
          "configurations": {
            "production": {
              "devServerTarget": "my-app:serve:production"
            }
          }
        },
        "lint": {
          "builder": "@angular-devkit/build-angular:tslint",
          "options": {
            "tsConfig": "e2e/tsconfig.e2e.json",
            "exclude": [
              "**/node_modules/**"
            ]
          }
        }
      }
    }
  },
  "defaultProject": "my-app"
}

Answer 1

我尝试了@jriver27评论的解决方案，但是当我使用相对路径引用实质性主题CSS时遇到了以下错误。

模块构建中的错误失败（来自 ./node_modules/postcss-loader/src/index.js）：错误：找不到 '../../ ~@angular/material/prebuilt-themes/indigo-pink.css'

我使用import语句的“ reference”选项解决了该问题。您可以找到更多详细信息here。

@import (reference) "../../styles.less";