I am searching for a way to retrieve the event type of a svelte on:input event in TypeScript, but unfortunately, I am unable to locate it

In my Svelte input field, I have the following code:

 <input
    {type}
    {placeholder}
    on:input={(e) => emitChange(e)}
    class="pl-2 w-full h-full bg-sand border border-midnight dark:bg-midnight"
  />

This input triggers the following function:

  function emitChange(event: any) {
    const text = event.target.value
    dispatch("changeContent", {
      text,
    })
  }

Now, I want to replace the any type with the correct InputEvent. However, my attempts to import InputEvent from "svelte" failed with an error saying that it is not exported.

I then tried changing the function parameter to event: InputEvent, but encountered an error stating that 'value' does not exist on type 'EventTarget'. Even though when I console log the event, I can see a 'target' property with a value.

Further refining the function like this seems to work and provides some improvements:

  function emitChange(event: any) {
    console.log(event, "13rm")
    const { value } = event.target as HTMLInputElement // improvement
    const text = value
  }

Answer №1

This code is tailored for the most recent Svelte release (version 4.2.7) and utilizes

<script lang="ts">

function inputHandler(event: Event & { currentTarget: EventTarget & HTMLInputElement }) {
    if (!event.target) return;
    const { value } = event.target as HTMLInputElement;
    // perform actions with the value
}

The corresponding svelte input element is shown below:

<input type="text" on:input={inputHandler} />

Answer №2

The events coming from standard HTML components remain unchanged even when using Svelte. Svelte does not modify these native events. Therefore, the appropriate event type for the input element is InputEvent, and there is no need to import it separately in order to function.

Here's an example:

function emitChange(event: InputEvent) {
    console.log(event, "13rm")
    const { value } = event.target
    const text = value
}

Answer №3

Great job on your edit, just remember to switch the any to InputEvent:

function processEventChange(event: InputEvent) {
  console.log(event, "13rm")
  const { value } = event.target as HTMLInputElement
  const textValue = value
}

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