Type of theme in module/defaults.ts is not properly set

[funk1d]

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[ ] support request/question

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Current behavior

The type of theme in module/defaults.ts is not properly set, and will raise error when assigning default theme:

The expected type comes from property 'theme' which is declared here on type '{ separatorKeys?: string[]; separatorKeyCodes?: number[]; maxItems?: number; placeholder?: string; secondaryPlaceholder?: string; validators?: ValidatorFn[]; asyncValidators?: AsyncValidatorFn[]; onlyFromAutocomplete?: boolean; ... 24 more ...; animationDuration?: { ...; }; }'

Expected behavior

Change theme: ''; to theme: string; will make things work again.

Minimal reproduction of the problem with instructions (if applicable)

import { TagInputModule } from 'ngx-chips';

import { CommonModule } from '@angular/common';
import { NgModule } from '@angular/core';

TagInputModule.withDefaults({
  tagInput: {
    theme: 'dark'
  }
});

@NgModule({
  declarations: [],
  imports: [CommonModule, TagInputModule],
  exports: [TagInputModule]
})
export class NgxChipsModule {}

What do you use to build your app?. Please specify the version

Angular version:

     _                      _                 ____ _     ___
    / \   _ __   __ _ _   _| | __ _ _ __     / ___| |   |_ _|
   / △ \ | '_ \ / _` | | | | |/ _` | '__|   | |   | |    | |
  / ___ \| | | | (_| | |_| | | (_| | |      | |___| |___ | |
 /_/   \_\_| |_|\__, |\__,_|_|\__,_|_|       \____|_____|___|
                |___/
    

Angular CLI: 8.3.20
Node: 13.2.0
OS: darwin x64
Angular: 8.2.14
... animations, common, compiler, compiler-cli, core, forms
... language-service, platform-browser, platform-browser-dynamic
... router

Package                           Version
-----------------------------------------------------------
@angular-devkit/architect         0.803.20
@angular-devkit/build-angular     0.803.20
@angular-devkit/build-optimizer   0.803.20
@angular-devkit/build-webpack     0.803.20
@angular-devkit/core              8.3.20
@angular-devkit/schematics        8.3.20
@angular/cdk                      8.2.3
@angular/cli                      8.3.20
@angular/material                 8.2.3
@ngtools/webpack                  8.3.20
@schematics/angular               8.3.20
@schematics/update                0.803.20
rxjs                              6.5.3
typescript                        3.5.3
webpack                           4.39.2

ngx-chips version:

2.1.0

Browser: [all]