could not find module “@angular-devkit/build-angular” Solution
What is angular builder?
Angular provides some builders that are used by the CLI for commands such as ng build , ng test , and ng lint . Default target configurations for these and other built-in CLI builders can be found (and customized) in the “architect” section of the workspace configuration file, angular. json .
A file named angular. json at the root level of an Angular workspace provides workspace-wide and project-specific configuration defaults for build and development tools provided by the Angular CLI.
Solution
Install
@angular-devkit/build-angular
as dev dependency. This package is newly introduced in Angular 6.0npm install --save-dev @angular-devkit/build-angular
or,
yarn add @angular-devkit/build-angular --dev