8000 fix: ensure #if blocks correctly guard against nullable prop values by rChaoz · Pull Request #16140 · sveltejs/svelte · GitHub
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fix: ensure #if blocks correctly guard against nullable prop values #16140

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fix: ensure #if blocks correctly guard against nullable prop values #16140

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1588365
thing
rChaoz Jun 12, 2025
144d3cc
format
rChaoz Jun 12, 2025
3b9fdf9
Correctly initialize oldProps so it's not null even if it's never read
rChaoz Jun 12, 2025
d546f19
Make it work even if no spread props are used
rChaoz Jun 12, 2025
642105f
Make it work with out transitions
rChaoz Jun 12, 2025
bb239fb
Revert #15469
rChaoz Jun 12, 2025
8072ab5
Lint & format
rChaoz Jun 12, 2025
587c385
Much better implementation
rChaoz Jun 12, 2025
3ee6b62
Restore some stuff from #15469, but differently
rChaoz Jun 12, 2025
d04e4bb
Update test snapshots
rChaoz Jun 12, 2025
bd1fb74
Fix derived pause logic
rChaoz Jun 12, 2025
e2290b5
Fix more tests
rChaoz Jun 12, 2025
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@rChaoz
rChaoz committed Jun 12, 2025
commit 15883654f38bec87b2db3c7a7fe56ed73c48682b
15 changes: 10 additions & 5 deletions packages/svelte/src/internal/client/reactivity/props.js
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Original file line number Diff line number Diff line change
Expand Up @@ -17,6 +17,8 @@ import { LEGACY_DERIVED_PROP, LEGACY_PROPS, STATE_SYMBOL } from '#client/constan
import { proxy } from '../proxy.js';
import { capture_store_binding } from './store.js';
import { legacy_mode_flag } from '../../flags/index.js';
import { component_context } from '../context.js';
import { teardown } from './effects.js';

/**
* @param {((value?: number) => number)} fn
Expand Down Expand Up @@ -159,16 +161,17 @@ export function legacy_rest_props(props, exclude) {
* The proxy handler for spread props. Handles the incoming array of props
* that looks like `() => { dynamic: props }, { static: prop }, ..` and wraps
* them so that the whole thing is passed to the component as the `$$props` argument.
* @template {Record<string | symbol, unknown>} T
* @type {ProxyHandler<{ props: Array<T | (() => T)> }>}}
* @typedef {Record<string | symbol, unknown>} T
* @type {ProxyHandler<{ props: Array<T | (() => T)>, oldProps: T, destroyed: boolean }>}}
*/
const spread_props_handler = {
get(target, key) {
if (target.destroyed && key in target.oldProps) return target.oldProps[key]
let i = target.props.length;
while (i--) {
let p = target.props[i];
if (is_function(p)) p = p();
if (typeof p === 'object' && p !== null && key in p) return p[key];
if (typeof p === 'object' && p !== null && key in p) return (target.oldProps[key] = p[key]);
}
},
set(target, key, value) {
Expand All @@ -178,7 +181,7 @@ const spread_props_handler = {
if (is_function(p)) p = p();
const desc = get_descriptor(p, key);
if (desc && desc.set) {
desc.set(value);
desc.set(target.oldProps[key] = value);
return true;
}
}
Expand Down Expand Up @@ -238,7 +241,9 @@ const spread_props_handler = {
* @returns {any}
*/
export function spread_props(...props) {
return new Proxy({ props }, spread_props_handler);
let destroyed = false
teardown(() => { destroyed = true })
return new Proxy({ props, oldProps: {}, get destroyed() { return destroyed } }, spread_props_handler);
}

/**
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