mirror of https://github.com/sveltejs/svelte
Simon Holthausen
5 hours ago
parent
15ccee8e0f
commit
91d215664f
@ -0,0 +1,30 @@
|
||||
import { tick } from 'svelte';
|
||||
import { test } from '../../test';
|
||||
|
||||
const buttons = `
|
||||
<button>update</button>
|
||||
<button>show</button>
|
||||
<button>resolve</button>
|
||||
`;
|
||||
|
||||
// Same as `async-state-read-new-dependency`, but the branch is selected by an eager
|
||||
// expression: the eager batch hides every other batch's writes, so a newly created
|
||||
// reader inside it must still see the latest value of `value` rather than `undefined`
|
||||
export default test({
|
||||
mode: ['client'],
|
||||
async test({ assert, target }) {
|
||||
await tick();
|
||||
const [update, show, resolve] = target.querySelectorAll('button');
|
||||
|
||||
update.click(); // pending batch writes `value`
|
||||
await tick();
|
||||
|
||||
show.click(); // eager flush creates the branch, which reads `value` for the first time
|
||||
await tick();
|
||||
assert.htmlEqual(target.innerHTML, `${buttons}<p>1</p>`);
|
||||
|
||||
resolve.click();
|
||||
await tick();
|
||||
assert.htmlEqual(target.innerHTML, `${buttons}<p>1</p>`);
|
||||
}
|
||||
});
|
||||
@ -0,0 +1,19 @@
|
||||
<script>
|
||||
let value = $state();
|
||||
let show = $state(false);
|
||||
const deferred = Promise.withResolvers();
|
||||
|
||||
function wait(value) {
|
||||
return value === undefined ? '' : deferred.promise;
|
||||
}
|
||||
</script>
|
||||
|
||||
<button onclick={() => (value = { x: 1 })}>update</button>
|
||||
<button onclick={() => (show = true)}>show</button>
|
||||
<button onclick={() => deferred.resolve('')}>resolve</button>
|
||||
|
||||
{await wait(value)}
|
||||
|
||||
{#if $state.eager(show)}
|
||||
<p>{value.x}</p>
|
||||
{/if}
|
||||
@ -0,0 +1,14 @@
|
||||
<script>
|
||||
let { x, s, slow, log } = $props();
|
||||
|
||||
// async result of x; `d` only flips when it crosses 0, so incrementing x doesn't change it
|
||||
let sx = $derived(await slow(x));
|
||||
let d = $derived(sx > 0);
|
||||
|
||||
$effect(() => {
|
||||
log(`${s}/${d}`);
|
||||
});
|
||||
</script>
|
||||
|
||||
<p>{sx}</p>
|
||||
<p>{await slow(s)}</p>
|
||||
@ -0,0 +1,33 @@
|
||||
import { tick } from 'svelte';
|
||||
import { test } from '../../test';
|
||||
|
||||
// When a later batch's write is hidden from an earlier batch, its write version must be
|
||||
// hidden as well — otherwise reactions of that source look dirty to the earlier batch
|
||||
// and re-run even though they see the old (unchanged) value
|
||||
export default test({
|
||||
async test({ assert, target, instance }) {
|
||||
const [x, s, resolve] = target.querySelectorAll('button');
|
||||
|
||||
resolve.click();
|
||||
await tick();
|
||||
resolve.click();
|
||||
await tick();
|
||||
assert.deepEqual(instance.get_logs(), ['0/true']);
|
||||
|
||||
x.click(); // B1: slow(x = 2) pending; `d` stays true
|
||||
await tick();
|
||||
s.click(); // B2: slow(s = 1) pending; the $effect is dirtied by `s` and deferred in B2
|
||||
await tick();
|
||||
assert.deepEqual(instance.get_logs(), ['0/true']);
|
||||
|
||||
// B1 commits while B2 is pending. In B1's world nothing the effect depends on changed
|
||||
// (`s` is hidden and still 0, `d` is still true), so it must not run
|
||||
resolve.click();
|
||||
await tick();
|
||||
assert.deepEqual(instance.get_logs(), ['0/true']);
|
||||
|
||||
resolve.click();
|
||||
await tick();
|
||||
assert.deepEqual(instance.get_logs(), ['0/true', '1/true']);
|
||||
}
|
||||
});
|
||||
@ -0,0 +1,27 @@
|
||||
<script>
|
||||
import Child from './Child.svelte';
|
||||
let x = $state(1);
|
||||
let s = $state(0);
|
||||
let logs = [];
|
||||
|
||||
const resolvers = [];
|
||||
function slow(v) {
|
||||
return new Promise((r) => resolvers.push(() => r(v)));
|
||||
}
|
||||
function log(v) {
|
||||
logs.push(v);
|
||||
}
|
||||
export function get_logs() {
|
||||
return logs;
|
||||
}
|
||||
</script>
|
||||
|
||||
<button onclick={() => x++}>x</button>
|
||||
<button onclick={() => s++}>s</button>
|
||||
<button onclick={() => resolvers.shift()?.()}>resolve</button>
|
||||
<button onclick={() => resolvers.pop()?.()}>resolve last</button>
|
||||
|
||||
<svelte:boundary>
|
||||
{#snippet pending()}loading{/snippet}
|
||||
<Child {x} {s} {slow} {log} />
|
||||
</svelte:boundary>
|
||||
Loading…
Reference in new issue