title: Angular 9 mat-progress-buttons error: ERROR in Failed to compile entry-point mat-progress-buttons (es2015 as esm2015) due to compilation errors
body: <p>Getting an error with mat-progress-button given below after updating from Angular 8 to Angular 9.
  It was working fine with Angular 8. Is MatProgressButton incompatible with Angular 9? </p>
  
  <pre><code>node_modules/mat-progress-buttons/esm2015/mat-progress-buttons.js:181:26 - error NG1010: Value at position 1 in the NgModule.imports of MatProgressButtonsModule is not a reference: [object Object]
  </code></pre>
  
  <p>The import looks like:
  <code>import { MatProgressButtonsModule } from 'mat-progress-buttons';</code></p>
  
  <p>My package.json looks like this:</p>
  
  <pre><code>  "dependencies": {
      "@angular/animations": "^9.0.2",
      "@angular/cdk": "^9.1.0",
      "@angular/common": "~9.0.2",
      "@angular/compiler": "~9.0.2",
      "@angular/core": "~9.0.2",
      "@angular/forms": "~9.0.2",
      "@angular/material": "^9.1.0",
      ...
      "@angular/router": "~9.0.2",
      "core-js": "^2.5.4",
      "mat-file-upload": "^1.3.2",
      "mat-progress-buttons": "^8.0.7",
      "rxjs": "~6.5.4",
      "tslib": "^1.10.0",
      "zone.js": "~0.10.2"
    },
    "devDependencies": {
      "@angular-devkit/build-angular": "~0.900.3",
      "@angular/cli": "~9.0.3",
      "@angular/compiler-cli": "~9.0.2",
      "@angular/language-service": "~9.0.2",
     ...
      "typescript": "^3.7.5"
    }
  }
  
  </code></pre>