error when binding implicit boolean to a prop (svelte-check )

[johnpapa]

Describe the bug

Binding implicitly typed boolean variables to a prop causes an error 👇

Error Message

Error: Type 'boolean' is not assignable to type 'false'. (ts)
{message}
isOpen={showModal}
on:handleNo={closeModal}

To Reproduce
Steps to reproduce the behavior:

1. Create a variable in a component

  export let isOpen = false;

1. Bind this boolean variable to a boolean prop

  <div id="modal" class="modal" class:is-active={isOpen}>

For example a code snippet that is treated in a way you don't expect.

Expected behavior

This should not cause an error.

If I revise it to explicitly be a boolean, it works without any errors.

  export let isOpen: boolean = false;

But it should work with implicit booleans where we initialize to a boolean immediately as shown above.

System (please complete the following information):

• OS: macOS
• IDE: VSCode
• Plugin/Package: Svelte for VSCode and svelte-check

cc @orta as per our discussion

[johnpapa]

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