[ issue ] : while upgrading angular 6 to latest (v12)

Upgrading angular project version to latest facing issues .]'

bhaskarjb@Bhaskars-MacBook-Pro:~/Desktop/mayadata-io/ci-e2e-dashboard|update-angular-version⚡ 
⇒  ng v

     _                      _                 ____ _     ___
    / \   _ __   __ _ _   _| | __ _ _ __     / ___| |   |_ _|
   / △ \ | '_ \ / _` | | | | |/ _` | '__|   | |   | |    | |
  / ___ \| | | | (_| | |_| | | (_| | |      | |___| |___ | |
 /_/   \_\_| |_|\__, |\__,_|_|\__,_|_|       \____|_____|___|
                |___/
    

Angular CLI: 12.1.0
Node: 14.15.0
Package Manager: npm 7.8.0
OS: darwin x64

Angular: 12.1.0
... cli, common, compiler, compiler-cli, core, forms
... language-service, platform-browser, platform-browser-dynamic
... router

Package                         Version
---------------------------------------------------------
@angular-devkit/architect       0.1201.0
@angular-devkit/build-angular   12.1.0
@angular-devkit/core            12.1.0
@angular-devkit/schematics      12.1.0
@schematics/angular             12.1.0
rxjs                            6.6.7
typescript                      4.3.4

bhaskarjb@Bhaskars-MacBook-Pro:~/Desktop/mayadata-io/ci-e2e-dashboard|update-angular-version⚡ 
⇒  ng build
⠋ Generating browser application bundles (phase: setup)...
Compiling @ng-bootstrap/ng-bootstrap : es2015 as esm2015

An error occurred during the build:
Error: Failed to compile entry-point @ng-bootstrap/ng-bootstrap (`es2015` as esm2015) due to compilation errors:
node_modules/@ng-bootstrap/ng-bootstrap/fesm2015/ng-bootstrap.js:7321:37 - error NG1006: Cannot combine @Input decorators with query decorators

7321     starTemplate: [{ type: Input }, { type: ContentChild, args: [TemplateRef,] }],
                                         ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
node_modules/@ng-bootstrap/ng-bootstrap/fesm2015/ng-bootstrap.js:7342:47 - error NG6001: The class 'NgbRating' is listed in the declarations of the NgModule 'NgbRatingModule', but is not a directive, a component, or a pipe. Either remove it from the NgModule's declarations, or add an appropriate Angular decorator.

7342     { type: NgModule, args: [{ declarations: [NgbRating], exports: [NgbRating], imports: [CommonModule] },] },
                                                   ~~~~~~~~~

  node_modules/@ng-bootstrap/ng-bootstrap/fesm2015/ng-bootstrap.js:7117:7
    7117 class NgbRating {
               ~~~~~~~~~
    'NgbRating' is declared here.
node_modules/@ng-bootstrap/ng-bootstrap/fesm2015/ng-bootstrap.js:7117:7 - error NG6003: Appears in the NgModule.exports of NgbRatingModule, but could not be resolved to an NgModule, Component, Directive, or Pipe class.

Is it missing an Angular annotation?

7117 class NgbRating {
           ~~~~~~~~~
node_modules/@ng-bootstrap/ng-bootstrap/fesm2015/ng-bootstrap.js:7331:7 - error NG6002: Appears in the NgModule.imports of NgbModule, but itself has errors

7331 class NgbRatingModule {
           ~~~~~~~~~~~~~~~
node_modules/@ng-bootstrap/ng-bootstrap/fesm2015/ng-bootstrap.js:7331:7 - error NG6003: Appears in the NgModule.exports of NgbModule, but itself has errors

7331 class NgbRatingModule {
           ~~~~~~~~~~~~~~~

    at /Users/bhaskarjb/Desktop/mayadata-io/ci-e2e-dashboard/node_modules/@angular/compiler-cli/ngcc/src/execution/tasks/completion.js:57:19
    at /Users/bhaskarjb/Desktop/mayadata-io/ci-e2e-dashboard/node_modules/@angular/compiler-cli/ngcc/src/execution/tasks/completion.js:31:13
    at /Users/bhaskarjb/Desktop/mayadata-io/ci-e2e-dashboard/node_modules/@angular/compiler-cli/ngcc/src/execution/create_compile_function.js:69:21
    at SingleProcessExecutorSync.SingleProcessorExecutorBase.doExecute (/Users/bhaskarjb/Desktop/mayadata-io/ci-e2e-dashboard/node_modules/@angular/compiler-cli/ngcc/src/execution/single_process_executor.js:36:17)
    at /Users/bhaskarjb/Desktop/mayadata-io/ci-e2e-dashboard/node_modules/@angular/compiler-cli/ngcc/src/execution/single_process_executor.js:57:59
    at SyncLocker.lock (/Users/bhaskarjb/Desktop/mayadata-io/ci-e2e-dashboard/node_modules/@angular/compiler-cli/ngcc/src/locking/sync_locker.js:34:24)
    at SingleProcessExecutorSync.execute (/Users/bhaskarjb/Desktop/mayadata-io/ci-e2e-dashboard/node_modules/@angular/compiler-cli/ngcc/src/execution/single_process_executor.js:57:27)
    at Object.mainNgcc (/Users/bhaskarjb/Desktop/mayadata-io/ci-e2e-dashboard/node_modules/@angular/compiler-cli/ngcc/src/main.js:74:25)
    at Object.process (/Users/bhaskarjb/Desktop/mayadata-io/ci-e2e-dashboard/node_modules/@angular/compiler-cli/ngcc/index.js:29:23)
    at NgccProcessor.processModule (/Users/bhaskarjb/Desktop/mayadata-io/ci-e2e-dashboard/node_modules/@ngtools/webpack/src/ngcc_processor.js:175:16)
    at /Users/bhaskarjb/Desktop/mayadata-io/ci-e2e-dashboard/node_modules/@ngtools/webpack/src/ivy/host.js:146:18
    at /Users/bhaskarjb/Desktop/mayadata-io/ci-e2e-dashboard/node_modules/@ngtools/webpack/src/ivy/host.js:76:24
    at Array.map (<anonymous>)
    at Object.host.resolveModuleNames (/Users/bhaskarjb/Desktop/mayadata-io/ci-e2e-dashboard/node_modules/@ngtools/webpack/src/ivy/host.js:74:32)
    at actualResolveModuleNamesWorker (/Users/bhaskarjb/Desktop/mayadata-io/ci-e2e-dashboard/node_modules/typescript/lib/typescript.js:109497:133)
    at resolveModuleNamesWorker (/Users/bhaskarjb/Desktop/mayadata-io/ci-e2e-dashboard/node_modules/typescript/lib/typescript.js:109760:26)
An unhandled exception occurred: Failed to compile entry-point @ng-bootstrap/ng-bootstrap (`es2015` as esm2015) due to compilation errors:
node_modules/@ng-bootstrap/ng-bootstrap/fesm2015/ng-bootstrap.js:7321:37 - error NG1006: Cannot combine @Input decorators with query decorators

7321     starTemplate: [{ type: Input }, { type: ContentChild, args: [TemplateRef,] }],
                                         ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
node_modules/@ng-bootstrap/ng-bootstrap/fesm2015/ng-bootstrap.js:7342:47 - error NG6001: The class 'NgbRating' is listed in the declarations of the NgModule 'NgbRatingModule', but is not a directive, a component, or a pipe. Either remove it from the NgModule's declarations, or add an appropriate Angular decorator.

7342     { type: NgModule, args: [{ declarations: [NgbRating], exports: [NgbRating], imports: [CommonModule] },] },
                                                   ~~~~~~~~~

  node_modules/@ng-bootstrap/ng-bootstrap/fesm2015/ng-bootstrap.js:7117:7
    7117 class NgbRating {
               ~~~~~~~~~
    'NgbRating' is declared here.
node_modules/@ng-bootstrap/ng-bootstrap/fesm2015/ng-bootstrap.js:7117:7 - error NG6003: Appears in the NgModule.exports of NgbRatingModule, but could not be resolved to an NgModule, Component, Directive, or Pipe class.

Is it missing an Angular annotation?

7117 class NgbRating {
           ~~~~~~~~~
node_modules/@ng-bootstrap/ng-bootstrap/fesm2015/ng-bootstrap.js:7331:7 - error NG6002: Appears in the NgModule.imports of NgbModule, but itself has errors

7331 class NgbRatingModule {
           ~~~~~~~~~~~~~~~
node_modules/@ng-bootstrap/ng-bootstrap/fesm2015/ng-bootstrap.js:7331:7 - error NG6003: Appears in the NgModule.exports of NgbModule, but itself has errors

7331 class NgbRatingModule {
           ~~~~~~~~~~~~~~~

See "/private/var/folders/5z/t_h_x0cj1v7gc9q54k8nsb1w0000gn/T/ng-iVt1Cw/angular-errors.log" for further details.

Start by reviewing the Angular CLI, Node, TypeScript, and @ng-bootstrap/ng-bootstrap versions in the issue, then reproduce the failure with ng build. Investigate the reported ng-bootstrap compilation errors involving NgbRating and starTemplate. Done means the project builds successfully after the Angular upgrade without these errors.