router.push replaces history

[adjsky]

Inertia adapter(s) affected

• React
• Vue 3
• Svelte
• Not Applicable

JS package version

2.0.17

Backend stack (optional)

No response

Describe the problem

router.push does not push a new history entry; instead, it replaces it if the provided url is identical to the previous one (even if it includes a hash).

As i see from the code, this behavior is intentional.

inertia/packages/core/src/page.ts

Line 62 in 4dd1942

replace = replace || isSameUrlWithoutHash(hrefToUrl(page.url), location)

I would like to know what this check is for, since the fact that push actually replaces the history state is very misleading and this behavior is not documented.

Steps to reproduce

<script>
    import { router } from '@inertiajs/svelte';
</script>

<button onclick={() => router.push({ url: '' })}>push (empty)</button>
<button onclick={() => router.push({ url: '#bogus' })}>push (hash)</button>
<button onclick={() => router.push({ url: '?bogus' })}>push (query)</button>