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ЮрийСПб
Asked:2020-09-18 00:46:02 +0800 CST2020-09-18 00:46:02 +0800 CST

Angular prod build 在无法分配给引用或变量时给出错误！

  • 772

无法构建应用程序的prod版本。

IDE 仅在控制台中提供以下消息：

无法分配给引用或变量中的错误！

我只能通过将这些选项添加到构建命令来解决这个问题：

--aot=false --buildOptimizer=false

但是，即使使用这些选项，应用程序在部署后已经在浏览器中崩溃，并出现以下错误：

错误类型错误：无法读取未定义的属性“init”

这可以通过添加一个选项来解决：

--optimization=false

结果，我只能部署应用程序的开发版本，没有优化和其他事情。

当我尝试使用此命令构建应用程序时：

npm run ng build -- --prod

我得到这个日志：

0 info it worked if it ends with ok
1 verbose cli [ 'C:\\Backend\\nodejs\\node.exe',
1 verbose cli   'C:\\Users\\USER_NAME\\AppData\\Roaming\\npm\\node_modules\\npm\\bin\\npm-cli.js',
1 verbose cli   'run',
1 verbose cli   'ng',
1 verbose cli   'build',
1 verbose cli   '--',
1 verbose cli   '--prod' ]
2 info using npm@6.10.2
3 info using node@v10.15.3
4 verbose run-script [ 'preng', 'ng', 'postng' ]
5 info lifecycle dont-play-with-gp-web@0.0.2~preng: dont-play-with-gp-web@0.0.2
6 info lifecycle dont-play-with-gp-web@0.0.2~ng: dont-play-with-gp-web@0.0.2
7 verbose lifecycle dont-play-with-gp-web@0.0.2~ng: unsafe-perm in lifecycle true
8 verbose lifecycle dont-play-with-gp-web@0.0.2~ng: PATH: C:\Users\USER_NAME\AppData\Roaming\npm\node_modules\npm\node_modules\npm-lifecycle\node-gyp-bin;C:\DEV\WebStormProjects\dont-play-with-gp-web\node_modules\.bin;C:\DEV\WebStormProjects\dont-play-with-gp-web\node_modules\.bin;C:\Windows\system32;C:\Windows;C:\Windows\System32\Wbem;C:\Windows\System32\WindowsPowerShell\v1.0\;C:\Windows\System32\OpenSSH\;C:\Program Files\Intel\WiFi\bin\;C:\Program Files\Common Files\Intel\WirelessCommon\;C:\Program Files (x86)\NVIDIA Corporation\PhysX\Common;C:\WINDOWS\system32;C:\WINDOWS;C:\WINDOWS\System32\Wbem;C:\WINDOWS\System32\WindowsPowerShell\v1.0\;C:\WINDOWS\System32\OpenSSH\;C:\Program Files\Git\cmd;C:\Backend\IntelliJ IDEA 2018.3.5\jre64;C:\Backend\PostgreSQL\10\bin;C:\Backend\nodejs;C:\Backend\WinSCP\;C:\Android\sdk\platform-tools;C:\Program Files (x86)\Intel\Intel(R) Management Engine Components\DAL;C:\Program Files\Intel\Intel(R) Management Engine Components\DAL;C:\Users\USER_NAME\AppData\Local\Microsoft\WindowsApps;
9 verbose lifecycle dont-play-with-gp-web@0.0.2~ng: CWD: C:\DEV\WebStormProjects\dont-play-with-gp-web
10 silly lifecycle dont-play-with-gp-web@0.0.2~ng: Args: [ '/d /s /c', 'ng "build" "--prod"' ]
11 silly lifecycle dont-play-with-gp-web@0.0.2~ng: Returned: code: 1  signal: null
12 info lifecycle dont-play-with-gp-web@0.0.2~ng: Failed to exec ng script
13 verbose stack Error: dont-play-with-gp-web@0.0.2 ng: `ng "build" "--prod"`
13 verbose stack Exit status 1
13 verbose stack     at EventEmitter.<anonymous> (C:\Users\USER_NAME\AppData\Roaming\npm\node_modules\npm\node_modules\npm-lifecycle\index.js:326:16)
13 verbose stack     at EventEmitter.emit (events.js:189:13)
13 verbose stack     at ChildProcess.<anonymous> (C:\Users\USER_NAME\AppData\Roaming\npm\node_modules\npm\node_modules\npm-lifecycle\lib\spawn.js:55:14)
13 verbose stack     at ChildProcess.emit (events.js:189:13)
13 verbose stack     at maybeClose (internal/child_process.js:970:16)
13 verbose stack     at Process.ChildProcess._handle.onexit (internal/child_process.js:259:5)
14 verbose pkgid dont-play-with-gp-web@0.0.2
15 verbose cwd C:\DEV\WebStormProjects\dont-play-with-gp-web
16 verbose Windows_NT 10.0.17134
17 verbose argv "C:\\Backend\\nodejs\\node.exe" "C:\\Users\\USER_NAME\\AppData\\Roaming\\npm\\node_modules\\npm\\bin\\npm-cli.js" "run" "ng" "build" "--" "--prod"
18 verbose node v10.15.3
19 verbose npm  v6.10.2
20 error code ELIFECYCLE
21 error errno 1
22 error dont-play-with-gp-web@0.0.2 ng: `ng "build" "--prod"`
22 error Exit status 1
23 error Failed at the dont-play-with-gp-web@0.0.2 ng script.
23 error This is probably not a problem with npm. There is likely additional logging output above.
24 verbose exit [ 1, true ]

我尝试更新所有依赖项，但没有帮助。

通话结果ng version：

Angular CLI: 8.3.4
Node: 10.15.3
OS: win32 x64
Angular: 8.2.6
... animations, common, compiler, compiler-cli, core, forms
... language-service, platform-browser, platform-browser-dynamic
... router

Package                           Version
-----------------------------------------------------------
@angular-devkit/architect         0.803.4
@angular-devkit/build-angular     0.803.4
@angular-devkit/build-optimizer   0.803.4
@angular-devkit/build-webpack     0.803.4
@angular-devkit/core              8.3.4
@angular-devkit/schematics        8.3.4
@angular/cdk                      8.2.0
@angular/cli                      8.3.4
@angular/flex-layout              8.0.0-beta.27
@angular/material                 8.2.0
@ngtools/webpack                  8.3.4
@schematics/angular               8.3.4
@schematics/update                0.803.4
rxjs                              6.5.3
typescript                        3.5.3
webpack                           4.39.2

并且package.json：

{
  "name": "dont-play-with-gp-web",
  "version": "0.0.2",
  "scripts": {
    "ng": "ng",
    "start": "ng serve",
    "build": "ng build",
    "test": "ng test",
    "lint": "ng lint",
    "e2e": "ng e2e"
  },
  "private": true,
  "dependencies": {
    "@angular/animations": "^8.2.6",
    "@angular/cdk": "^8.2.0",
    "@angular/common": "~8.2.6",
    "@angular/compiler": "~8.2.6",
    "@angular/core": "~8.2.6",
    "@angular/flex-layout": "8.0.0-beta.27",
    "@angular/forms": "~8.2.6",
    "@angular/material": "^8.2.0",
    "@angular/platform-browser": "~8.2.6",
    "@angular/platform-browser-dynamic": "~8.2.6",
    "@angular/router": "~8.2.6",
    "angular-markdown-editor": "^2.0.2",
    "hammerjs": "^2.0.8",
    "jquery": "^3.4.1",
    "ngx-infinite-scroll": "^8.0.0",
    "ngx-markdown": "^8.1.0",
    "ngx-material-file-input": "^2.0.0",
    "rxjs": "~6.5.3",
    "tslib": "^1.9.0",
    "zone.js": "^0.9.1"
  },
  "devDependencies": {
    "@angular-devkit/build-angular": "~0.803.4",
    "@angular/cli": "~8.3.4",
    "@angular/compiler-cli": "~8.2.6",
    "@angular/language-service": "~8.2.6",
    "@types/jasmine": "~3.4.0",
    "@types/jasminewd2": "~2.0.3",
    "@types/jquery": "^3.3.31",
    "@types/node": "~12.7.5",
    "codelyzer": "^5.0.0",
    "jasmine-core": "~3.4.0",
    "jasmine-spec-reporter": "~4.2.1",
    "karma": "~4.3.0",
    "karma-chrome-launcher": "~3.1.0",
    "karma-coverage-istanbul-reporter": "~2.1.0",
    "karma-jasmine": "~2.0.1",
    "karma-jasmine-html-reporter": "^1.4.0",
    "protractor": "~5.4.0",
    "ts-node": "~8.4.1",
    "tslint": "~5.20.0",
    "typescript": "^3.5.3"
  }
}

在这种情况下该怎么办？如何找到错误的原因以及如何修复它？

如果有帮助，以下是来源：

https://bitbucket.org/mohaxspb/gp-web/commits/tag/ATTEMPT_TO_FIX_PROD_BUILD_WITH_DEPS_UPDATE

英语中的相同问题：https ://stackoverflow.com/questions/57978475/angular-prod-build-error-in-cannot-assign-to-a-reference-or-variable

UPD： Taki 找到了一种在不破坏 PROD 构建的情况下使用我的指令的方法。但是，这需要在此处编辑编译器源

检查模板中的表达式类型if (localExpr instanceof ReadPropExpr)，如果再添​​加一个条件|| localExpr instanceof ReadVarExpr)，一切正常（PROD 构建、部署和在浏览器中启动）。也可以通过将其添加到消息中来改进显示的错误。JSON.stringify(ast)

typescript

1 个回答

  1. Best Answer

    一般来说，来自 AST 解析器的异常很令人头疼，因为它们不携带任何有用的东西，除了一条消息：

    无法分配给引用或变量中的错误！

    （这里我们需要一张从电影蜘蛛侠中哭泣的托比马奎尔的照片🙂）

    例如，链接器总是在无法组合模板表达式的地方写入，因此使用它要容易得多。

    该问题的解决方案之一当然是尝试谷歌，但整个圈子都会关闭每个人都会提供检查指令的事实ngModel。

    第二种选择更硬核。值得进入编译器本身并进行一些调试。在构建过程中使用 Angular node_modules/@angular/compiler/bundles/compiler.umd.js，因为该节点只理解 CommonJS（我们不提出 ESM 主题）。

    接下来，我们进行文本搜索Cannot assign to a reference or variable!并找到类_AstToIrVisitor和方法visitPropertyWrite。我们看到这条线：

    // Otherwise it's an error.
throw new Error('Cannot assign to a reference or variable!');

    我们确信这是一场惨败，在没有任何信息的情况下抛出异常🤨

    然后我们让它变得更简单，在我们添加异常之前，函数的参数在console.log(ast)哪里，之后解析器会在控制台中给我们一个类的实例：astvisitPropertyWritePropertyWrite

    PropertyWrite {
  span: ParseSpan { start: 0, end: 73 },
  receiver: ImplicitReceiver { span: ParseSpan { start: 0, end: 0 } },
  name: 'translation',
  value: MethodCall {
    span: ParseSpan { start: 14, end: 73 },
    receiver: ImplicitReceiver { span: [ParseSpan] },
    name: 'getTranslationForLanguageFromArticle',
    args: [ [PropertyRead], [PropertyRead] ]
  }
}

    我们明白，我们需要找出属性translation和方法调用之间的关系getTranslationForLanguageFromArticle。在 IDE 中搜索后，我们在 IDE 中找到该行feed.component.html：

    (change)="translation = getTranslationForLanguageFromArticle($event.value, article)"

    这是解析器无法理解的。

    最好只在组件中创建一个方法changeTranslation并更改其中的属性translation：

    this.translation = getTranslationForLanguageFromArticle(value, article);

    好吧，在模板中，进行替换：

    (change)="changeTranslation($event.value, article)"
    • 2

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