feat(progressbar): create type interface (#5440)

Author: vitaliy-bobrov

src/progressbar/bar.component.ts

@@ -8,6 +8,7 @@ import {
 } from '@angular/core';
 
 import { ProgressbarComponent } from './progressbar.component';
+import { ProgressbarType } from './progressbar-type.interface';
 import { isBs3 } from 'ngx-bootstrap/utils';
 
 // todo: number pipe
@@ -32,7 +33,7 @@ export class BarComponent implements OnInit, OnDestroy {
   max: number;
 
   /** provide one of the four supported contextual classes: `success`, `info`, `warning`, `danger` */
-  @Input() type: string;
+  @Input() type: ProgressbarType;
 
   /** current value of progress bar */
   @Input()

src/progressbar/progressbar-type.interface.ts

@@ -0,0 +1 @@
+export type ProgressbarType = 'success' | 'info' | 'warning' | 'danger';

src/progressbar/progressbar.component.ts

@@ -1,5 +1,6 @@
 import { Component, HostBinding, Input } from '@angular/core';
 import { ProgressbarConfig } from './progressbar.config';
+import { ProgressbarType } from './progressbar-type.interface';
 import { isBs3 } from 'ngx-bootstrap/utils';
 import { BarComponent } from './bar.component';
 
@@ -34,7 +35,7 @@ export class ProgressbarComponent {
   }
 
   /** provide one of the four supported contextual classes: `success`, `info`, `warning`, `danger` */
-  @Input() type: string;
+  @Input() type: ProgressbarType;
   /** current value of progress bar. Could be a number or array of objects
    * like {"value":15,"type":"info","label":"15 %"}
    */

src/progressbar/public_api.ts

@@ -2,3 +2,4 @@ export { BarComponent } from './bar.component';
 export { ProgressbarComponent } from './progressbar.component';
 export { ProgressbarModule } from './progressbar.module';
 export { ProgressbarConfig } from './progressbar.config';
+export { ProgressbarType } from './progressbar-type.interface';