What is the correct way to properly enter a Svelte component instance variable?

Currently, I am delving into learning Svelte and specifically exploring how to bind to a component instance as demonstrated in this tutorial:

As I progress through the tutorial, I am attempting to convert it to Typescript.

However, I have encountered an error from the Typescript compiler (via ESLint).

Code

<!-- ./ComponentInstance.svelte -->
<script lang="ts">
    import InputField from './Input.svelte';

    // field represents the child component!
  let field: InputField;
</script>

<!-- binding this component to a variable -->
<InputField bind:this={field} />

<!-- error arises here with field.focus() -->
<button on:click={() => field.focus()}> Focus field </button> 




<!-- ./Input.svelte -->
<script lang="ts">
    // Bound to the HTML input element.
    let input: HTMLInputElement;

    // Exporting a function as a property.
    export function focus() {
        // Focuses on the variable, thereby focusing the bound HTML element.
        input.focus();
    }
</script>

<!-- binding the element to a variable -->
<input bind:this={input} />
pq@pq:~/src/personal/gitlab/l

TS Error

./src/lib/bindings/ComponentInstance.svelte
  12:25  error  Unsafe return of an `any` typed value  @typescript-eslint/no-unsafe-return
  12:25  error  Unsafe call of an `any` typed value    @typescript-eslint/no-unsafe-call

I am struggling to figure out how to ensure TS compiles without errors in this scenario. Any assistance would be greatly appreciated.

Answer №1

This code is error-free. Feel free to review this StackBlitz implementation.

If you encounter issues, consider the following steps as it might be a tooling problem:

  • Check tsconfig.json and svelte.config.js files and compare them with your own.
  • Execute a npm update at your app's root directory.
  • Ensure your node version is 16.14 or higher. Even if it is, update it to LTS for good measure.

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