error on ng serve angular v12

[doctordldh]

Bug Report

Affected Package

@angular/cli

Is this a regression?

No

Description

I upgraded from angular 11 to angular 12.
When I run the below common
node --max_old_space_size=8192 ./node_modules/@angular/cli/bin/ng serve

the is error show below without any clue...

Exception or Error

Warning: C:/Users/kokke/Documents/HLY/HLYUX/src/app/services/speech-synthesizer.service.ts is part of the TypeScript compilation but it's unused.
Add only entry points to the 'files' or 'include' properties in your tsconfig.

Warning: C:/Users/kokke/Documents/HLY/HLYUX/src/app/services/style-manager.ts is part of the TypeScript compilation but it's unused.
Add only entry points to the 'files' or 'include' properties in your tsconfig.

Warning: C:/Users/kokke/Documents/HLY/HLYUX/src/environments/environment.hmr.ts is part of the TypeScript compilation but it's unused.
Add only entry points to the 'files' or 'include' properties in your tsconfig.

Warning: C:/Users/kokke/Documents/HLY/HLYUX/src/environments/environment.prod.ts is part of the TypeScript compilation but it's unused.
Add only entry points to the 'files' or 'include' properties in your tsconfig.



Error: undefined:5:112729: property missing ':'

Your Environment

Angular Version:

Angular CLI: 12.0.0
Node: 14.16.1
Package Manager: npm 6.14.12
OS: win32 x64

Angular:
...

Package                      Version
------------------------------------------------------
@angular-devkit/architect    0.1200.0 (cli-only)
@angular-devkit/core         12.0.0 (cli-only)
@angular-devkit/schematics   12.0.0 (cli-only)
@schematics/angular          12.0.0 (cli-only)

Anything else relevant?
my package.json is below
"dependencies": {
"@agm/core": "1.1.0",
"@angular/animations": "12.0.0",
"@angular/cdk": "12.0.0",
"@angular/common": "12.0.0",
"@angular/compiler": "12.0.0",
"@angular/core": "12.0.0",
"@angular/flex-layout": "11.0.0-beta.33",
"@angular/forms": "12.0.0",
"@angular/localize": "12.0.0",
"@angular/material": "12.0.0",
"@angular/material-moment-adapter": "12.0.0",
"@angular/platform-browser": "12.0.0",
"@angular/platform-browser-dynamic": "12.0.0",
"@angular/router": "12.0.0",
"@angular/youtube-player": "12.0.0",
"@aspnet/signalr": "3.0.0-preview6.19307.2",
"@devexpress/analytics-core": "20.2.7",
"@ngrx/effects": "12.0.0",
"@ngrx/router-store": "12.0.0",
"@ngrx/store": "12.0.0",
"@ngrx/store-devtools": "12.0.0",
"@ngx-translate/core": "13.0.0",
"@ngx-translate/http-loader": "6.0.0",
"@swimlane/ngx-datatable": "19.0.0",
"@syncfusion/ej2": "19.1.63",
"@syncfusion/ej2-angular-diagrams": "19.1.63",
"@syncfusion/ej2-angular-documenteditor": "19.1.63",
"@syncfusion/ej2-angular-dropdowns": "19.1.63",
"@syncfusion/ej2-angular-kanban": "19.1.63",
"@syncfusion/ej2-angular-layouts": "19.1.63",
"@syncfusion/ej2-angular-navigations": "19.1.63",
"@syncfusion/ej2-angular-pdfviewer": "19.1.63",
"@syncfusion/ej2-angular-richtexteditor": "19.1.63",
"@syncfusion/ej2-angular-schedule": "19.1.63",
"@syncfusion/ej2-pdf-export": "19.1.63",
"@types/prismjs": "1.16.5",
"agm-direction": "0.8.9",
"angular-mentions": "1.3.0",
"angular2-signaturepad": "3.0.4",
"angular2-text-mask": "9.0.0",
"classlist.js": "1.1.20150312",
"core-js": "3.12.1",
"devexpress-reporting": "20.2.7",
"devexpress-reporting-angular": "20.2.7",
"devextreme": "20.2.7",
"devextreme-angular": "20.2.7",
"file-saver-es": "2.0.5",
"guid-typescript": "1.0.9",
"hammerjs": "2.0.8",
"html2canvas": "1.0.0-rc.7",
"jquery-ui": "1.12.1",
"jwt-decode": "3.1.2",
"lodash": "4.17.21",
"math-expression-evaluator": "1.3.7",
"moment": "2.29.1",
"ng-keyboard-shortcuts": "10.1.17",
"ngx-auto-unsubscribe": "3.0.1",
"ngx-color-picker": "11.0.0",
"ngx-cookie-service": "11.0.2",
"ngx-json-viewer": "3.0.2",
"ngx-webcam": "0.3.2",
"perfect-scrollbar": "1.5.1",
"prismjs": "1.23.0",
"quagga": "0.12.1",
"rxjs": "6.6.7",
"stream": "0.0.2",
"web-animations-js": "2.3.2",
"zone.js": "0.11.4"
},
"devDependencies": {
"@angular-devkit/build-angular": "12.0.0",
"@angular/cli": "12.0.0",
"@angular/compiler-cli": "12.0.0",
"@angular/language-service": "12.0.0",
"@angularclass/hmr": "3.0.0",
"@types/googlemaps": "3.43.3",
"@types/jasmine": "3.7.4",
"@types/jasminewd2": "2.0.9",
"@types/jwt-decode": "2.2.1",
"@types/lodash": "4.14.169",
"@types/node": "15.0.3",
"codelyzer": "6.0.2",
"jasmine-core": "3.7.1",
"jasmine-spec-reporter": "7.0.0",
"karma": "6.3.2",
"karma-chrome-launcher": "3.1.0",
"karma-coverage-istanbul-reporter": "3.0.3",
"karma-jasmine": "4.0.1",
"karma-jasmine-html-reporter": "1.6.0",
"protractor": "7.0.0",
"ts-node": "9.1.1",
"tslib": "2.2.0",
"typescript": "4.2.4",
"webpack-bundle-analyzer": "4.4.1"
}

[JoostK]

Duplicate of #20760.

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