Angular v6升级至v8遇__NGTOOLS_PRIVATE_API_2错误求助

我正在将一个旧的Angular v6项目升级，按官方指南升级到v8后卡住，出现错误Could not find API compiler-cli, function __NGTOOLS_PRIVATE_API_2。当前使用Node.js 12.11.0，以下是错误日志和package.json配置，求排查明显问题。

错误日志 #

Error: Could not find API compiler-cli, function __NGTOOLS_PRIVATE_API_2
    at _error (C:\Users\Camron\workspace\ddos\ui\node_modules\@ngtools\webpack\src\ngtools_api.js:8:11)
    at getApiMember (C:\Users\Camron\workspace\ddos\ui\node_modules\@ngtools\webpack\src\ngtools_api.js:11:32)
    at Object.<anonymous> (C:\Users\Camron\workspace\ddos\ui\node_modules\@ngtools\webpack\src\ngtools_api.js:51:35)
    at Module._compile (C:\Users\Camron\workspace\ddos\ui\node_modules\v8-compile-cache\v8-compile-cache.js:192:30)
    at Object.Module._extensions..js (internal/modules/cjs/loader.js:962:10)
    at Module.load (internal/modules/cjs/loader.js:798:32)
    at Function.Module._load (internal/modules/cjs/loader.js:711:12)
    at Module.require (internal/modules/cjs/loader.js:838:19)
    at require (C:\Users\Camron\workspace\ddos\ui\node_modules\v8-compile-cache\v8-compile-cache.js:159:20)
    at Object.<anonymous> (C:\Users\Camron\workspace\ddos\ui\node_modules\@ngtools\webpack\src\angular_compiler_plugin.js:28:23)
    at Module._compile (C:\Users\Camron\workspace\ddos\ui\node_modules\v8-compile-cache\v8-compile-cache.js:192:30)
    at Object.Module._extensions..js (internal/modules/cjs/loader.js:962:10)
    at Module.load (internal/modules/cjs/loader.js:798:32)
    at Function.Module._load (internal/modules/cjs/loader.js:711:12)
    at Module.require (internal/modules/cjs/loader.js:838:19)
    at require (C:\Users\Camron\workspace\ddos\ui\node_modules\v8-compile-cache\v8-compile-cache.js:159:20)
    at Object.<anonymous> (C:\Users\Camron\workspace\ddos\ui\node_modules\@ngtools\webpack\src\index.js:13:10)
    at Module._compile (C:\Users\Camron\workspace\ddos\ui\node_modules\v8-compile-cache\v8-compile-cache.js:192:30)
    at Object.Module._extensions..js (internal/modules/cjs/loader.js:962:10)
    at Module.load (internal/modules/cjs/loader.js:798:32)
    at Function.Module._load (internal/modules/cjs/loader.js:711:12)
    at Module.require (internal/modules/cjs/loader.js:838:19)
    at require (C:\Users\Camron\workspace\ddos\ui\node_modules\v8-compile-cache\v8-compile-cache.js:159:20)
    at Object.<anonymous> (C:\Users\Camron\workspace\ddos\ui\config\webpack.prod.js:4:22)
    at Module._compile (C:\Users\Camron\workspace\ddos\ui\node_modules\v8-compile-cache\v8-compile-cache.js:192:30)
    at Object.Module._extensions..js (internal/modules/cjs/loader.js:962:10)
    at Module.load (internal/modules/cjs/loader.js:798:32)
    at Function.Module._load (internal/modules/cjs/loader.js:711:12)
    at Module.require (internal/modules/cjs/loader.js:838:19)
    at require (C:\Users\Camron\workspace\ddos\ui\node_modules\v8-compile-cache\v8-compile-cache.js:159:20)
npm ERR! code ELIFECYCLE

Package.json配置 #

{
  "name": "test",
  "version": "1.0.0",
  "repository": {
    "type": "git"
  },
  "license": "UNLICENSED",
  "private": true,
  "scripts": {
    "start": "webpack-dev-server --open --config ./config/webpack.dev.js --progress --port 8080",
    "start-prod": "webpack-dev-server --open --config ./config/webpack.prod.js --progress --port 8080",
    "test": "rimraf tests_output &&  node --max_old_space_size=4096 ./node_modules/karma/bin/karma start",
    "test-debug": "node --max_old_space_size=4096 ./node_modules/karma/bin/karma start --source-map=false --debug",
    "posttest": "remap-istanbul -i tests_output/coverage/report.json -o tests_output/coverage -t html",
    "build": "rimraf dist && webpack --config ./config/webpack.prod.js --progress --profile --bail --display-error-details",
    "build-linux": "rimraf dist && node --max_old_space_size=4096 ./node_modules/webpack/bin/webpack.js --config ./config/webpack.prod.js --progress --profile --bail --display-error-details",
    "deploy": "npm run build && node ./config/s3-upload.js"
  },
  "dependencies": {
    "@angular-devkit/schematics": "^16.1.3",
    "@angular/animations": "^9.1.13",
    "@angular/cdk": "^8.0.0",
    "@angular/common": "^9.1.13",
    "@angular/compiler": "^9.1.13",
    "@angular/core": "^9.1.13",
    "@angular/forms": "^9.1.13",
    "@angular/material": "^8.0.0",
    "@angular/platform-browser": "^9.1.13",
    "@angular/platform-browser-dynamic": "^9.1.13",
    "@angular/platform-server": "^9.1.13",
    "@angular/router": "^9.1.13",
    "@auth0/angular-jwt": "2.0.0",
    "@swimlane/ngx-charts": "^8.1.0",
    "@swimlane/ngx-datatable": "^15.0.0",
    "@types/geojson": "7946.0.8",
    "@types/swagger-ui-dist": "3.0.5",
    "angularx-qrcode": "1.6.4",
    "bootstrap": "3.3.7",
    "classlist.js": "1.1.20150312",
    "core-js": "^3.1.3",
    "crypto-js": "3.1.9-1",
    "d3": "5.5.0",
    "file-saver": "^1.3.8",
    "hammerjs": "^2.0.8",
    "ie-shim": "0.1.0",
    "ip": "1.1.5",
    "ngx-clipboard": "^12.2.1",
    "ngx-json-viewer": "2.4.0",
    "node-pre-gyp": "0.10.0",
    "normalise.scss": "1.0.1",
    "npm": "^6.9.0",
    "pako": "1.0.6",
    "prismjs": "1.29.0",
    "reflect-metadata": "0.1.12",
    "rxjs": "^6.5.0",
    "swagger-ui-dist": "3.25.1",
    "tslib": "^1.14.1",
    "zone.js": "^0.10.3"
  },
  "devDependencies": {
    "@angular-devkit/build-angular": "0.12.4",
    "@angular/cli": "^9.1.15",
    "@angular/compiler-cli": "^9.1.13",
    "@angular/language-service": "^9.1.13",
    "@ngtools/webpack": "6.1.3",
    "@types/core-js": "0.9.43",
    "@types/crypto-js": "3.1.36",
    "@types/d3": "^5.0.0",
    "@types/file-saver": "1.3.0",
    "@types/jasmine": "2.8.8",
    "@types/node": "10.5.2",
    "angular-router-loader": "0.8.5",
    "angular2-template-loader": "0.6.2",
    "awesome-typescript-loader": "5.2.0",
    "codelyzer": "4.4.2",
    "compression-webpack-plugin": "1.1.11",
    "copy-webpack-plugin": "4.5.2",
    "css-loader": "0.28.11",
    "enhanced-resolve": "3.4.1",
    "exports-loader": "0.7.0",
    "extract-text-webpack-plugin": "4.0.0-beta.0",
    "fork-ts-checker-webpack-plugin": "0.5.2",
    "html-loader": "0.5.5",
    "html-webpack-plugin": "4.0.0-alpha",
    "jasmine-core": "3.1.0",
    "jasmine-spec-reporter": "4.2.1",
    "json-loader": "0.5.7",
    "karma": "2.0.5",
    "karma-chrome-launcher": "2.2.0",
    "karma-cli": "1.0.1",
    "karma-coverage": "1.1.2",
    "karma-coverage-istanbul-reporter": "2.0.0",
    "karma-jasmine": "1.1.2",
    "karma-jasmine-html-reporter": "1.2.0",
    "karma-junit-reporter": "1.2.0",
    "karma-scss-preprocessor": "3.0.0",
    "karma-source-map-support": "1.3.0",
    "karma-sourcemap-loader": "0.3.7",
    "karma-spec-reporter": "0.0.32",
    "karma-webpack": "3.0.0",
    "mini-css-extract-plugin": "0.4.0",
    "node-sass": "^4.14.1",
    "null-loader": "0.1.1",
    "protractor": "5.4.0",
    "python-shell": "0.4.0",
    "raw-loader": "0.5.1",
    "remap-istanbul": "0.12.0",
    "rimraf": "2.6.1",
    "rxjs-tslint": "^0.1.8",
    "s3": "4.4.0",
    "sass-loader": "7.1.0",
    "scss": "0.2.4",
    "style-loader": "0.22.1",
    "sync-exec": "0.6.2",
    "ts-loader": "4.4.2",
    "tslint": "5.11.0",
    "typescript": "^3.8.3",
    "uglifyjs-webpack-plugin": "1.2.7",
    "webpack": "4.16.5",
    "webpack-bundle-analyzer": "2.13.1",
    "webpack-cli": "^3.3.12",
    "webpack-dev-middleware": "3.1.3",
    "webpack-merge": "4.1.4"
  }
}

核心问题诊断 #

1. @ngtools/webpack版本严重不匹配：当前使用的6.1.3是Angular 6的版本，但你的Angular核心包已经升级到9.1.13（你提到升级到v8，但实际配置是v9），旧版@ngtools/webpack无法调用新版compiler-cli的私有API，直接导致报错。
2. Angular生态版本混乱：Angular核心包是v9，但@angular/cdk、@angular/material停留在v8，@angular-devkit/build-angular是v6/7版本，@angular-devkit/schematics却跳到了v16，跨版本依赖冲突必然引发兼容性问题。
3. 依赖链断裂：@ngtools/webpack依赖compiler-cli的特定API，版本不匹配时找不到对应函数是典型症状。

修复方案 #

1. 统一Angular全栈版本
   将所有Angular官方依赖（@angular/core、@angular/cli、@ngtools/webpack、@angular-devkit/build-angular、@angular-devkit/schematics）统一升级到9.1.15（与现有@angular/cli版本对齐）；同时将@angular/cdk、@angular/material升级到9.2.4（Angular 9兼容的最新稳定版）。

2. 清理并重装依赖

   • 删除node_modules目录和package-lock.json文件
   • 执行npm install重新安装所有依赖
   • 运行npm run build验证修复效果

3. 额外优化建议

   • Node.js 12.11.0虽兼容Angular 9，但建议升级到12.x分支的稳定版本（如12.22.12），减少潜在的Node API兼容问题
   • 检查webpack配置文件中对AngularCompilerPlugin的引用，确保使用新版@ngtools/webpack提供的插件实例

内容的提问来源于stack exchange，提问作者iamcootis