I am trying to migrate an application from Angular 7 to Angular 9.
ng version returns:
Angular CLI: 9.1.7
Node: 10.15.0
OS: win32 x64
Angular: 7.2.16
Package Version
-----------------------------------------------------------
@angular-devkit/architect 0.900.7
@angular-devkit/build-angular 0.900.7
@angular-devkit/build-optimizer 0.900.7
@angular-devkit/build-webpack 0.900.7
@angular-devkit/core 9.1.7
@angular-devkit/schematics 9.1.7
@angular/cdk 9.2.4
@angular/cli 9.1.7
@angular/common 9.1.11
@angular/compiler-cli 9.1.11
@angular/material 9.2.4
@ngtools/webpack 9.1.7
@schematics/angular 9.1.7
@schematics/update 0.901.7
rxjs 6.5.5
typescript 3.7.5
webpack 4.43.0
when I attempt to build I get the above error.
The log returns:
[error] TypeError: Object prototype may only be an Object or null: undefined
at setPrototypeOf (<anonymous>)
at Object.__extends (C:\source\repos\AM-Vendors\node_modules\tslib\tslib.js:69:9)
at C:\source\repos\AM-Vendors\node_modules\@angular\compiler-cli\src\ngtsc\indexer\src\template.js:117:17
at C:\source\repos\AM-Vendors\node_modules\@angular\compiler-cli\src\ngtsc\indexer\src\template.js:324:6
at C:\source\repos\AM-Vendors\node_modules\@angular\compiler-cli\src\ngtsc\indexer\src\template.js:3:17
at Object.<anonymous> (C:\source\repos\AM-Vendors\node_modules\@angular\compiler-cli\src\ngtsc\indexer\src\template.js:9:3)
at Module._compile (internal/modules/cjs/loader.js:689:30)
at Object.Module._extensions..js (internal/modules/cjs/loader.js:700:10)
at Module.load (internal/modules/cjs/loader.js:599:32)
at tryModuleLoad (internal/modules/cjs/loader.js:538:12)
at Function.Module._load (internal/modules/cjs/loader.js:530:3)
at Module.require (internal/modules/cjs/loader.js:637:17)
at require (internal/modules/cjs/helpers.js:22:18)
at C:\source\repos\AM-Vendors\node_modules\@angular\compiler-cli\src\ngtsc\indexer\src\transform.js:20:22
at C:\source\repos\AM-Vendors\node_modules\@angular\compiler-cli\src\ngtsc\indexer\src\transform.js:10:17
at Object.<anonymous> (C:\source\repos\AM-Vendors\node_modules\@angular\compiler-cli\src\ngtsc\indexer\src\transform.js:16:3)
I don't know why the version report Angular-Cli at 9.1.7 and then Angular at 7.2.16, nor how to change the Angular version showing 7.2.16.