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What are signal inputs and model() in modern Angular?

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01

Understand the problem

Explain signal-based inputs.

signalsinputs
02

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03

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input() declares a signal-based component input (read reactively, with optional required/transform), and model() creates a two-way bindable signal input that emits changes automatically — replacing @Input/@Output boilerplate in the signals era.

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04

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input() and model()
import { Component, input, model, computed } from '@angular/core';

@Component({
  selector: 'app-rating',
  standalone: true,
  template: '<button (click)="bump()">{{ label() }}: {{ value() }}</button>',
})
export class RatingComponent {
  label = input('Rating');           // signal input  (parent: [label]="...")
  value = model(0);                  // two-way        (parent: [(value)]="...")
  label2 = computed(() => this.label().toUpperCase());
  bump() { this.value.update(v => v + 1); }  // child can write a model()
}
05

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