The rule result is invalid due to the occurrence of the Function()

As I proceed with the upgrade from angular 6 to angular 7, I am diligently following the guidelines provided on the official Angular website.

Upon executing the command to update angular/cli and core for version 7:

$ ng update @angular/cli@v7 @angular/core@v7
,

I encountered an error message stating Invalid rule result: Function().

Below is the output from the command prompt:

added 106 packages from 85 contributors, removed 5 packages, updated 5 packages, moved 1 package and audited 36489 packages in 39.604s
found 18 vulnerabilities (12 low, 1 moderate, 5 high)
  run `npm audit fix` to fix them, or `npm audit` for details
Invalid rule result: Function().

Seeking assistance to understand why this error message is occurring.

Here are the dependencies listed in the package.json file:

"dependencies": {
    "@angular/animations": "^8.0.0",
    "@angular/cdk": "^7.3.7",
    "@angular/common": "^8.0.0",
    "@angular/compiler": "^8.0.0",
    "@angular/core": "^8.0.0",
    "@angular/forms": "^8.0.0",
    "@angular/http": "^6.0.3",
    "@angular/material": "^7.3.7",
    "@angular/platform-browser": "^8.0.0",
    "@angular/platform-browser-dynamic": "^8.0.0",
    "@angular/router": "^8.0.0",
    "core-js": "^2.5.4",
    "hammerjs": "^2.0.8",
    "ngx-loading": "^3.0.1",
    "rxjs": "6.5.2",
    "underscore": "^1.9.1",
    "zone.js": "^0.9.1"
},
"devDependencies": {
    "@angular-devkit/build-angular": "~0.6.8",
    "@angular/cli": "~7.3.9",
    "@angular/compiler-cli": "^8.0.0",
    "@angular/language-service": "^8.0.0",
    "@types/jasmine": "~2.8.6",
    "@types/jasminewd2": "~2.0.3",
    "@types/node": "~8.9.4",
    "bootstrap-sass": "^3.3.7",
    "codelyzer": "~4.2.1",
    "jasmine-core": "~2.99.1",
    "jasmine-spec-reporter": "~4.2.1",
    "karma": "~1.7.1",
    "karma-chrome-launcher": "~2.2.0",
    "karma-coverage-istanbul-reporter": "~2.0.0",
    "karma-jasmine": "~1.1.1",
    "karma-jasmine-html-reporter": "^0.2.2",
    "karma-scss-preprocessor": "^3.0.0",
    "protractor": "~5.3.0",
    "ts-node": "~5.0.1",
    "tslint": "~5.9.1",
    "typescript": "~3.4.5"
}
javascriptangulartypescriptangular-cli

Answer №1

After struggling with this issue for quite some time, I found that upgrading the Angular dependencies to the latest version within the same major release (in our case, 6) can be highly beneficial in resolving Angular Upgrade errors. By doing so, you not only ensure compatibility but also bring in any necessary patches provided by the Angular team.

To address this, I decided to update my Angular CLI dev dependency from "@angular/cli": "6.0.3" to "@angular/cli": "6.2.9", which was the most recent version available at that time within the same major release. The process can be executed simply by running the following command:

ng update @angular/<a href="/cdn-cgi/l/email-protection" class="__cf_email__" data-cfemail="9cfff0f5dcaab2aeb2a5">[email protected]</a>

Subsequently, I proceeded to run 

ng update @angular/cli@7 @angular/core@7
without encountering the "Invalid rule result: Function()." error anymore.

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