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import {
current_component_context,
current_reaction,
current_dependencies,
current_effect,
current_untracked_writes,
current_untracking,
get,
is_batching_effect,
is_runes,
mark_reactions,
schedule_effect,
set_current_untracked_writes,
set_last_inspected_signal,
set_signal_status,
untrack
} from '../runtime.js';
import { equals, safe_equals } from './equality.js';
import { CLEAN, DERIVED, DIRTY, BRANCH_EFFECT } from '../constants.js';
import { UNINITIALIZED } from '../../../constants.js';
import * as e from '../errors.js';
/**
* @template V
* @param {V} value
* @returns {import('#client').Source<V>}
*/
/*#__NO_SIDE_EFFECTS__*/
export function source(value) {
/** @type {import('#client').Source<V>} */
const source = {
f: 0, // TODO ideally we could skip this altogether, but it causes type errors
reactions: null,
equals: equals,
v: value,
version: 0
};
if (DEV) {
/** @type {import('#client').ValueDebug<V>} */ (source).inspect = new Set();
}
return source;
}
/**
* @template V
* @param {V} initial_value
* @returns {import('#client').Source<V>}
*/
/*#__NO_SIDE_EFFECTS__*/
export function mutable_source(initial_value) {
const s = source(initial_value);
s.equals = safe_equals;
// bind the signal to the component context, in case we need to
// track updates to trigger beforeUpdate/afterUpdate callbacks
if (current_component_context !== null && current_component_context.l !== null) {
(current_component_context.l.s ??= []).push(s);
}
return s;
}
/**
* @template V
* @param {import('#client').Value<V>} source
* @param {V} value
*/
export function mutate(source, value) {
set(
source,
untrack(() => get(source))
);
return value;
}
/**
* @template V
* @param {import('#client').Source<V>} signal
* @param {V} value
* @returns {V}
*/
export function set(signal, value) {
var initialized = signal.v !== UNINITIALIZED;
if (
!current_untracking &&
initialized &&
current_reaction !== null &&
is_runes() &&
(current_reaction.f & DERIVED) !== 0
) {
e.state_unsafe_mutation();
}
if (!signal.equals(value)) {
signal.v = value;
// Increment write version so that unowned signals can properly track dirtiness
signal.version++;
// If the current signal is running for the first time, it won't have any
// reactions as we only allocate and assign the reactions after the signal
// has fully executed. So in the case of ensuring it registers the reaction
// properly for itself, we need to ensure the current effect actually gets
// scheduled. i.e:
//
// $effect(() => x++)
//
// We additionally want to skip this logic when initialising store sources
if (
is_runes() &&
initialized &&
current_effect !== null &&
(current_effect.f & CLEAN) !== 0 &&
(current_effect.f & BRANCH_EFFECT) === 0
) {
if (current_dependencies !== null && current_dependencies.includes(signal)) {
set_signal_status(current_effect, DIRTY);
schedule_effect(current_effect);
} else {
if (current_untracked_writes === null) {
set_current_untracked_writes([signal]);
} else {
current_untracked_writes.push(signal);
}
}
}
mark_reactions(signal, DIRTY, true);
if (DEV) {
if (is_batching_effect) {
set_last_inspected_signal(/** @type {import('#client').ValueDebug} */ (signal));
} else {
for (const fn of /** @type {import('#client').ValueDebug} */ (signal).inspect) fn();
}
}
}
return value;
}
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