When attempting to assign a 'string' type to the @Input property, I am receiving an error stating that it is not assignable to the 'PostCard Layout' type

Encountering an issue

The error message 'Type 'string' is not assignable to type 'PostCard Layout'' is being displayed

A parent component named page-blog.component.html is responsible for defining the class styles and passing them to the child component called post-card.component.ts

The problem arises in the parent HTML component when attempting to set the class styling variables from the class component, specifically with the section @Input() layout: PostCardLayout;

I have temporarily resolved this issue by adjusting the

"strictInputTypes": false,
setting in the tsconfig.json file, although I acknowledge this may lead to potential errors in future development.

The child class is defined in post-card.component.ts

import { Component, HostBinding, Input } from '@angular/core';

 export type PostCardLayout = 'list' | 'grid' | 'grid-sm';

 @Component({
  selector: 'app-post-card',
   templateUrl: './post-card.component.html',
  styleUrls: ['./post-card.component.scss']
 })
export class PostCardComponent {

@Input() post;

@Input() layout: PostCardLayout;

@HostBinding('class.post-card') classPostCard = true;

@HostBinding('class.post-card--layout--list') get classPostCardLayoutList(): boolean {
  return this.layout === 'list';
}

@HostBinding('class.post-card--layout--grid') get classPostCardLayoutGrid(): boolean {
  return this.layout === 'grid';
}

@HostBinding('class.post-card--layout--grid-sm') get classPostCardLayoutGridSm(): boolean {
  return this.layout === 'grid-sm';
}

constructor() { }
}

Below is the code snippet from the parent HTML component page-blog.component.html

                    <div class="posts-list__body">
                        <div *ngFor="let post of posts" class="posts-list__item">
                            <app-post-card
                                [post]="post"
                                [layout]="{
                                    classic: 'grid',
                                    list: 'list',
                                    grid: 'grid-sm'
                                }"
                            ></app-post-card>
                        </div>
                    </div>

Answer №1

You have defined the PostCardLayout to accept one of three values:

'list' | 'grid' | 'grid-sm'

It seems like you are trying to pass a JSON object:

[layout]="{
          classic: 'grid',
          list: 'list',
          grid: 'grid-sm'
      }[layout]"

Furthermore, there is an extra [layout] at the end of your input, which looks like a typo.

Based on my interpretation, with the typo and strictInputTypes turned off, your JSON may be converted into a string inadvertently.

Disabling

"strictInputTypes": false
is not recommended as it goes against one of TypeScript's core principles.

It appears that in your code, you simply want to assign one of the predefined values:

<app-post-card
      [post]="post"
      [layout]="'grid'">
</app-post-card>

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