What is the purpose of the @NgModule annotation in Angular Material?

I've been struggling with using Angular-Material Components in different components. Despite watching and reading various tutorials, I still can't seem to get them to work. The error message I keep encountering is:

compiler.js:2430 Uncaught Error: Unexpected directive 'MatToolbar' imported by the module 'MaterialModule'. Please add a @NgModule annotation.
    at syntaxError (compiler.js:2430)
    at compiler.js:18645
    at Array.forEach (<anonymous>)
    at CompileMetadataResolver.push../node_modules/@angular/compiler/fesm5/compiler.js.CompileMetadataResolver.getNgModuleMetadata (compiler.js:18620)
    ...

In an attempt to resolve this issue, I created a TypeScript file named material.ts which imports all the Material-Components that I need.

material.ts :

import { MatButtonModule, MatCheckboxModule, MatToolbar, MatToolbarRow } from '@angular/material';
import { NgModule } from '@angular/core';
import { MatToolbarModule } from '@angular/material/toolbar';

@NgModule({
  imports: [
    MatButtonModule,
    MatCheckboxModule,
    MatToolbar,
    MatToolbarRow,
    MatToolbarModule
  ],
  exports: [
    MatButtonModule,
    MatCheckboxModule,
    MatToolbar,
    MatToolbarRow,
    MatToolbarModule
  ]
})

export class MaterialModule { }

In my app.module.ts, I import the MaterialModule along with other necessary modules:

import { MaterialModule } from './material';
import { CvServiceService } from './service/cv-service.service';
...

Despite including the MaterialModule in my AppModule, Iā€™m still facing difficulties with utilizing Angular-Material Components effectively. Any guidance on how to properly use these components would be greatly appreciated.

Answer ā„–1

To successfully add the toolbar module, make sure to import MatToolbarModule, instead of just MatToolbar.

@NgModule({
  imports: [
    MatButtonModule,
    MatCheckboxModule,
    MatToolbarModule
  ],
  exports: [
    MatButtonModule,
    MatCheckboxModule,
    MatToolbarModule
  ]
})
export class MaterialModule { }

Answer ā„–2

The reason for the error lies in your attempt to import a non-module:

imports: [
    MatButtonModule,
    MatCheckboxModule,
    // MatToolbar,       // it's best to omit these
    // MatToolbarRow,    // as shown here
    MatToolbarModule
  ],

Remember, you should only import classes that are decorated with @NgModule, and typically they all end with the "Module" suffix.

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