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import { DEV } from 'esm-env';
import { define_property, get_descriptors, get_prototype_of } from '../shared/utils.js';
import {
destroy_effect,
effect,
execute_effect_teardown,
unlink_effect
} from './reactivity/effects.js';
import {
EFFECT,
RENDER_EFFECT,
DIRTY,
MAYBE_DIRTY,
CLEAN,
DERIVED,
UNOWNED,
DESTROYED,
INERT,
BRANCH_EFFECT,
STATE_SYMBOL,
BLOCK_EFFECT,
ROOT_EFFECT,
LEGACY_DERIVED_PROP,
DISCONNECTED
} from './constants.js';
import { flush_tasks } from './dom/task.js';
import { add_owner } from './dev/ownership.js';
import { mutate, set, source } from './reactivity/sources.js';
import { update_derived } from './reactivity/deriveds.js';
import * as e from './errors.js';
import { lifecycle_outside_component } from '../shared/errors.js';
import { FILENAME } from '../../constants.js';
const FLUSH_MICROTASK = 0;
const FLUSH_SYNC = 1;
// Used for DEV time error handling
/** @param {WeakSet<Error>} value */
const handled_errors = new WeakSet();
// Used for controlling the flush of effects.
let scheduler_mode = FLUSH_MICROTASK;
// Used for handling scheduling
let is_micro_task_queued = false;
export let is_flushing_effect = false;
export let is_destroying_effect = false;
/** @param {boolean} value */
export function set_is_flushing_effect(value) {
is_flushing_effect = value;
}
/** @param {boolean} value */
export function set_is_destroying_effect(value) {
is_destroying_effect = value;
}
// Handle effect queues
/** @type {Effect[]} */
let queued_root_effects = [];
let flush_count = 0;
/** @type {Effect[]} Stack of effects, dev only */
let dev_effect_stack = [];
// Handle signal reactivity tree dependencies and reactions
/** @type {null | Reaction} */
export let active_reaction = null;
/** @param {null | Reaction} reaction */
export function set_active_reaction(reaction) {
active_reaction = reaction;
}
/** @type {null | Effect} */
export let active_effect = null;
/** @param {null | Effect} effect */
export function set_active_effect(effect) {
active_effect = effect;
}
/**
* When sources are created within a derived, we record them so that we can safely allow
* local mutations to these sources without the side-effect error being invoked unnecessarily.
* @type {null | Source[]}
*/
export let derived_sources = null;
/**
* @param {Source[] | null} sources
*/
export function set_derived_sources(sources) {
derived_sources = sources;
}
/**
* The dependencies of the reaction that is currently being executed. In many cases,
* the dependencies are unchanged between runs, and so this will be `null` unless
* and until a new dependency is accessed — we track this via `skipped_deps`
* @type {null | Value[]}
*/
export let new_deps = null;
let skipped_deps = 0;
/**
* Tracks writes that the effect it's executed in doesn't listen to yet,
* so that the dependency can be added to the effect later on if it then reads it
* @type {null | Source[]}
*/
export let untracked_writes = null;
/** @param {null | Source[]} value */
export function set_untracked_writes(value) {
untracked_writes = value;
}
/** @type {number} Used by sources and deriveds for handling updates to unowned deriveds */
let current_version = 0;
// If we are working with a get() chain that has no active container,
// to prevent memory leaks, we skip adding the reaction.
export let skip_reaction = false;
// Handle collecting all signals which are read during a specific time frame
export let is_signals_recorded = false;
let captured_signals = new Set();
// Handling runtime component context
/** @type {ComponentContext | null} */
export let component_context = null;
/** @param {ComponentContext | null} context */
export function set_component_context(context) {
component_context = context;
}
/**
* The current component function. Different from current component context:
* ```html
* <!-- App.svelte -->
* <Foo>
* <Bar /> <!-- context == Foo.svelte, function == App.svelte -->
* </Foo>
* ```
* @type {ComponentContext['function']}
*/
export let dev_current_component_function = null;
/** @param {ComponentContext['function']} fn */
export function set_dev_current_component_function(fn) {
dev_current_component_function = fn;
}
export function increment_version() {
return ++current_version;
}
/** @returns {boolean} */
export function is_runes() {
return component_context !== null && component_context.l === null;
}
/**
* Determines whether a derived or effect is dirty.
* If it is MAYBE_DIRTY, will set the status to CLEAN
* @param {Reaction} reaction
* @returns {boolean}
*/
export function check_dirtiness(reaction) {
var flags = reaction.f;
if ((flags & DIRTY) !== 0) {
return true;
}
if ((flags & MAYBE_DIRTY) !== 0) {
var dependencies = reaction.deps;
var is_unowned = (flags & UNOWNED) !== 0;
if (dependencies !== null) {
var i;
if ((flags & DISCONNECTED) !== 0) {
for (i = 0; i < dependencies.length; i++) {
(dependencies[i].reactions ??= []).push(reaction);
}
reaction.f ^= DISCONNECTED;
}
for (i = 0; i < dependencies.length; i++) {
var dependency = dependencies[i];
if (check_dirtiness(/** @type {Derived} */ (dependency))) {
update_derived(/** @type {Derived} */ (dependency));
}
// If we are working with an unowned signal as part of an effect (due to !skip_reaction)
// and the version hasn't changed, we still need to check that this reaction
// is linked to the dependency source – otherwise future updates will not be caught.
if (
is_unowned &&
active_effect !== null &&
!skip_reaction &&
!dependency?.reactions?.includes(reaction)
) {
(dependency.reactions ??= []).push(reaction);
}
if (dependency.version > reaction.version) {
return true;
}
}
}
// Unowned signals should never be marked as clean.
if (!is_unowned) {
set_signal_status(reaction, CLEAN);
}
}
return false;
}
/**
* @param {Error} error
* @param {Effect} effect
* @param {ComponentContext | null} component_context
*/
function handle_error(error, effect, component_context) {
// Given we don't yet have error boundaries, we will just always throw.
if (!DEV || handled_errors.has(error) || component_context === null) {
throw error;
}
const component_stack = [];
const effect_name = effect.fn?.name;
if (effect_name) {
component_stack.push(effect_name);
}
/** @type {ComponentContext | null} */
let current_context = component_context;
while (current_context !== null) {
if (DEV) {
/** @type {string} */
var filename = current_context.function?.[FILENAME];
if (filename) {
const file = filename.split('/').pop();
component_stack.push(file);
}
}
current_context = current_context.p;
}
const indent = /Firefox/.test(navigator.userAgent) ? ' ' : '\t';
define_property(error, 'message', {
value: error.message + `\n${component_stack.map((name) => `\n${indent}in ${name}`).join('')}\n`
});
const stack = error.stack;
// Filter out internal files from callstack
if (stack) {
const lines = stack.split('\n');
const new_lines = [];
for (let i = 0; i < lines.length; i++) {
const line = lines[i];
if (line.includes('svelte/src/internal')) {
continue;
}
new_lines.push(line);
}
define_property(error, 'stack', {
value: error.stack + new_lines.join('\n')
});
}
handled_errors.add(error);
throw error;
}
/**
* @template V
* @param {Reaction} reaction
* @returns {V}
*/
export function update_reaction(reaction) {
var previous_deps = new_deps;
var previous_skipped_deps = skipped_deps;
var previous_untracked_writes = untracked_writes;
var previous_reaction = active_reaction;
var previous_skip_reaction = skip_reaction;
var prev_derived_sources = derived_sources;
new_deps = /** @type {null | Value[]} */ (null);
skipped_deps = 0;
untracked_writes = null;
active_reaction = (reaction.f & (BRANCH_EFFECT | ROOT_EFFECT)) === 0 ? reaction : null;
skip_reaction = !is_flushing_effect && (reaction.f & UNOWNED) !== 0;
derived_sources = null;
try {
var result = /** @type {Function} */ (0, reaction.fn)();
var deps = reaction.deps;
if (new_deps !== null) {
var i;
remove_reactions(reaction, skipped_deps);
if (deps !== null && skipped_deps > 0) {
deps.length = skipped_deps + new_deps.length;
for (i = 0; i < new_deps.length; i++) {
deps[skipped_deps + i] = new_deps[i];
}
} else {
reaction.deps = deps = new_deps;
}
if (!skip_reaction) {
for (i = skipped_deps; i < deps.length; i++) {
(deps[i].reactions ??= []).push(reaction);
}
}
} else if (deps !== null && skipped_deps < deps.length) {
remove_reactions(reaction, skipped_deps);
deps.length = skipped_deps;
}
return result;
} finally {
new_deps = previous_deps;
skipped_deps = previous_skipped_deps;
untracked_writes = previous_untracked_writes;
active_reaction = previous_reaction;
skip_reaction = previous_skip_reaction;
derived_sources = prev_derived_sources;
}
}
/**
* @template V
* @param {Reaction} signal
* @param {Value<V>} dependency
* @returns {void}
*/
function remove_reaction(signal, dependency) {
let reactions = dependency.reactions;
if (reactions !== null) {
var index = reactions.indexOf(signal);
if (index !== -1) {
var new_length = reactions.length - 1;
if (new_length === 0) {
reactions = dependency.reactions = null;
} else {
// Swap with last element and then remove.
reactions[index] = reactions[new_length];
reactions.pop();
}
}
}
// If the derived has no reactions, then we can disconnect it from the graph,
// allowing it to either reconnect in the future, or be GC'd by the VM.
if (
reactions === null &&
(dependency.f & DERIVED) !== 0 &&
// Destroying a child effect while updating a parent effect can cause a dependency to appear
// to be unused, when in fact it is used by the currently-updating parent. Checking `new_deps`
// allows us to skip the expensive work of disconnecting and immediately reconnecting it
(new_deps === null || !new_deps.includes(dependency))
) {
set_signal_status(dependency, MAYBE_DIRTY);
// If we are working with a derived that is owned by an effect, then mark it as being
// disconnected.
if ((dependency.f & (UNOWNED | DISCONNECTED)) === 0) {
dependency.f ^= DISCONNECTED;
}
remove_reactions(/** @type {Derived} **/ (dependency), 0);
}
}
/**
* @param {Reaction} signal
* @param {number} start_index
* @returns {void}
*/
export function remove_reactions(signal, start_index) {
var dependencies = signal.deps;
if (dependencies === null) return;
for (var i = start_index; i < dependencies.length; i++) {
remove_reaction(signal, dependencies[i]);
}
}
/**
* @param {Effect} signal
* @param {boolean} remove_dom
* @returns {void}
*/
export function destroy_effect_children(signal, remove_dom = false) {
var effect = signal.first;
signal.first = signal.last = null;
while (effect !== null) {
var next = effect.next;
destroy_effect(effect, remove_dom);
effect = next;
}
}
/**
* @param {Effect} effect
* @returns {void}
*/
export function update_effect(effect) {
var flags = effect.f;
if ((flags & DESTROYED) !== 0) {
return;
}
set_signal_status(effect, CLEAN);
var previous_effect = active_effect;
var previous_component_context = component_context;
active_effect = effect;
component_context = effect.ctx;
if (DEV) {
var previous_component_fn = dev_current_component_function;
dev_current_component_function = effect.component_function;
}
try {
if ((flags & BLOCK_EFFECT) === 0) {
destroy_effect_children(effect);
}
execute_effect_teardown(effect);
var teardown = update_reaction(effect);
effect.teardown = typeof teardown === 'function' ? teardown : null;
effect.version = current_version;
if (DEV) {
dev_effect_stack.push(effect);
}
} catch (error) {
handle_error(/** @type {Error} */ (error), effect, previous_component_context);
} finally {
active_effect = previous_effect;
component_context = previous_component_context;
if (DEV) {
dev_current_component_function = previous_component_fn;
}
}
}
function infinite_loop_guard() {
if (flush_count > 1000) {
flush_count = 0;
if (DEV) {
try {
e.effect_update_depth_exceeded();
} catch (error) {
// stack is garbage, ignore. Instead add a console.error message.
define_property(error, 'stack', {
value: ''
});
// eslint-disable-next-line no-console
console.error(
'Last ten effects were: ',
dev_effect_stack.slice(-10).map((d) => d.fn)
);
dev_effect_stack = [];
throw error;
}
} else {
e.effect_update_depth_exceeded();
}
}
flush_count++;
}
/**
* @param {Array<Effect>} root_effects
* @returns {void}
*/
function flush_queued_root_effects(root_effects) {
var length = root_effects.length;
if (length === 0) {
return;
}
infinite_loop_guard();
var previously_flushing_effect = is_flushing_effect;
is_flushing_effect = true;
try {
for (var i = 0; i < length; i++) {
var effect = root_effects[i];
if ((effect.f & CLEAN) === 0) {
effect.f ^= CLEAN;
}
/** @type {Effect[]} */
var collected_effects = [];
process_effects(effect, collected_effects);
flush_queued_effects(collected_effects);
}
} finally {
is_flushing_effect = previously_flushing_effect;
}
}
/**
* @param {Array<Effect>} effects
* @returns {void}
*/
function flush_queued_effects(effects) {
var length = effects.length;
if (length === 0) return;
for (var i = 0; i < length; i++) {
var effect = effects[i];
if ((effect.f & (DESTROYED | INERT)) === 0 && check_dirtiness(effect)) {
update_effect(effect);
// Effects with no dependencies or teardown do not get added to the effect tree.
// Deferred effects (e.g. `$effect(...)`) _are_ added to the tree because we
// don't know if we need to keep them until they are executed. Doing the check
// here (rather than in `update_effect`) allows us to skip the work for
// immediate effects.
if (effect.deps === null && effect.first === null && effect.nodes_start === null) {
if (effect.teardown === null) {
// remove this effect from the graph
unlink_effect(effect);
} else {
// keep the effect in the graph, but free up some memory
effect.fn = null;
}
}
}
}
}
function process_deferred() {
is_micro_task_queued = false;
if (flush_count > 1001) {
return;
}
const previous_queued_root_effects = queued_root_effects;
queued_root_effects = [];
flush_queued_root_effects(previous_queued_root_effects);
if (!is_micro_task_queued) {
flush_count = 0;
if (DEV) {
dev_effect_stack = [];
}
}
}
/**
* @param {Effect} signal
* @returns {void}
*/
export function schedule_effect(signal) {
if (scheduler_mode === FLUSH_MICROTASK) {
if (!is_micro_task_queued) {
is_micro_task_queued = true;
queueMicrotask(process_deferred);
}
}
var effect = signal;
while (effect.parent !== null) {
effect = effect.parent;
var flags = effect.f;
if ((flags & (ROOT_EFFECT | BRANCH_EFFECT)) !== 0) {
if ((flags & CLEAN) === 0) return;
effect.f ^= CLEAN;
}
}
queued_root_effects.push(effect);
}
/**
*
* This function both runs render effects and collects user effects in topological order
* from the starting effect passed in. Effects will be collected when they match the filtered
* bitwise flag passed in only. The collected effects array will be populated with all the user
* effects to be flushed.
*
* @param {Effect} effect
* @param {Effect[]} collected_effects
* @returns {void}
*/
function process_effects(effect, collected_effects) {
var current_effect = effect.first;
var effects = [];
main_loop: while (current_effect !== null) {
var flags = current_effect.f;
var is_branch = (flags & BRANCH_EFFECT) !== 0;
var is_skippable_branch = is_branch && (flags & CLEAN) !== 0;
if (!is_skippable_branch && (flags & INERT) === 0) {
if ((flags & RENDER_EFFECT) !== 0) {
if (is_branch) {
current_effect.f ^= CLEAN;
} else if (check_dirtiness(current_effect)) {
update_effect(current_effect);
}
var child = current_effect.first;
if (child !== null) {
current_effect = child;
continue;
}
} else if ((flags & EFFECT) !== 0) {
effects.push(current_effect);
}
}
var sibling = current_effect.next;
if (sibling === null) {
let parent = current_effect.parent;
while (parent !== null) {
if (effect === parent) {
break main_loop;
}
var parent_sibling = parent.next;
if (parent_sibling !== null) {
current_effect = parent_sibling;
continue main_loop;
}
parent = parent.parent;
}
}
current_effect = sibling;
}
// We might be dealing with many effects here, far more than can be spread into
// an array push call (callstack overflow). So let's deal with each effect in a loop.
for (var i = 0; i < effects.length; i++) {
child = effects[i];
collected_effects.push(child);
process_effects(child, collected_effects);
}
}
/**
* Internal version of `flushSync` with the option to not flush previous effects.
* Returns the result of the passed function, if given.
* @param {() => any} [fn]
* @returns {any}
*/
export function flush_sync(fn) {
var previous_scheduler_mode = scheduler_mode;
var previous_queued_root_effects = queued_root_effects;
try {
infinite_loop_guard();
/** @type {Effect[]} */
const root_effects = [];
scheduler_mode = FLUSH_SYNC;
queued_root_effects = root_effects;
is_micro_task_queued = false;
flush_queued_root_effects(previous_queued_root_effects);
var result = fn?.();
flush_tasks();
if (queued_root_effects.length > 0 || root_effects.length > 0) {
flush_sync();
}
flush_count = 0;
if (DEV) {
dev_effect_stack = [];
}
return result;
} finally {
scheduler_mode = previous_scheduler_mode;
queued_root_effects = previous_queued_root_effects;
}
}
/**
* Returns a promise that resolves once any pending state changes have been applied.
* @returns {Promise<void>}
*/
export async function tick() {
await Promise.resolve();
// By calling flush_sync we guarantee that any pending state changes are applied after one tick.
// TODO look into whether we can make flushing subsequent updates synchronously in the future.
flush_sync();
}
/**
* @template V
* @param {Value<V>} signal
* @returns {V}
*/
export function get(signal) {
var flags = signal.f;
if ((flags & DESTROYED) !== 0) {
return signal.v;
}
if (is_signals_recorded) {
captured_signals.add(signal);
}
// Register the dependency on the current reaction signal.
if (active_reaction !== null) {
if (derived_sources !== null && derived_sources.includes(signal)) {
e.state_unsafe_local_read();
}
var deps = active_reaction.deps;
// If the signal is accessing the same dependencies in the same
// order as it did last time, increment `skipped_deps`
// rather than updating `new_deps`, which creates GC cost
if (new_deps === null && deps !== null && deps[skipped_deps] === signal) {
skipped_deps++;
} else if (new_deps === null) {
new_deps = [signal];
} else {
new_deps.push(signal);
}
if (
untracked_writes !== null &&
active_effect !== null &&
(active_effect.f & CLEAN) !== 0 &&
(active_effect.f & BRANCH_EFFECT) === 0 &&
untracked_writes.includes(signal)
) {
set_signal_status(active_effect, DIRTY);
schedule_effect(active_effect);
}
}
if ((flags & DERIVED) !== 0) {
var derived = /** @type {Derived} */ (signal);
if (check_dirtiness(derived)) {
update_derived(derived);
}
}
return signal.v;
}
/**
* Like `get`, but checks for `undefined`. Used for `var` declarations because they can be accessed before being declared
* @template V
* @param {Value<V> | undefined} signal
* @returns {V | undefined}
*/
export function safe_get(signal) {
return signal && get(signal);
}
/**
* Invokes a function and captures all signals that are read during the invocation,
* then invalidates them.
* @param {() => any} fn
*/
export function invalidate_inner_signals(fn) {
var previous_is_signals_recorded = is_signals_recorded;
var previous_captured_signals = captured_signals;
is_signals_recorded = true;
captured_signals = new Set();
var captured = captured_signals;
var signal;
try {
untrack(fn);
} finally {
is_signals_recorded = previous_is_signals_recorded;
if (is_signals_recorded) {
for (signal of captured_signals) {
previous_captured_signals.add(signal);
}
}
captured_signals = previous_captured_signals;
}
for (signal of captured) {
// Go one level up because derived signals created as part of props in legacy mode
if ((signal.f & LEGACY_DERIVED_PROP) !== 0) {
for (const dep of /** @type {Derived} */ (signal).deps || []) {
if ((dep.f & DERIVED) === 0) {
mutate(dep, null /* doesnt matter */);
}
}
} else {
mutate(signal, null /* doesnt matter */);
}
}
}
/**
* Use `untrack` to prevent something from being treated as an `$effect`/`$derived` dependency.
*
* https://svelte-5-preview.vercel.app/docs/functions#untrack
* @template T
* @param {() => T} fn
* @returns {T}
*/
export function untrack(fn) {
const previous_reaction = active_reaction;
try {
active_reaction = null;
return fn();
} finally {
active_reaction = previous_reaction;
}
}
const STATUS_MASK = ~(DIRTY | MAYBE_DIRTY | CLEAN);
/**
* @param {Signal} signal
* @param {number} status
* @returns {void}
*/
export function set_signal_status(signal, status) {
signal.f = (signal.f & STATUS_MASK) | status;
}
/**
* Retrieves the context that belongs to the closest parent component with the specified `key`.
* Must be called during component initialisation.
*
* https://svelte.dev/docs/svelte#getcontext
* @template T
* @param {any} key
* @returns {T}
*/
export function getContext(key) {
const context_map = get_or_init_context_map('getContext');
const result = /** @type {T} */ (context_map.get(key));
if (DEV) {
const fn = /** @type {ComponentContext} */ (component_context).function;
if (fn) {
add_owner(result, fn, true);
}
}
return result;
}
/**
* Associates an arbitrary `context` object with the current component and the specified `key`
* and returns that object. The context is then available to children of the component
* (including slotted content) with `getContext`.
*
* Like lifecycle functions, this must be called during component initialisation.
*
* https://svelte.dev/docs/svelte#setcontext
* @template T
* @param {any} key
* @param {T} context
* @returns {T}
*/
export function setContext(key, context) {
const context_map = get_or_init_context_map('setContext');
context_map.set(key, context);
return context;
}
/**
* Checks whether a given `key` has been set in the context of a parent component.
* Must be called during component initialisation.
*
* https://svelte.dev/docs/svelte#hascontext
* @param {any} key
* @returns {boolean}
*/
export function hasContext(key) {
const context_map = get_or_init_context_map('hasContext');
return context_map.has(key);
}
/**
* Retrieves the whole context map that belongs to the closest parent component.
* Must be called during component initialisation. Useful, for example, if you
* programmatically create a component and want to pass the existing context to it.
*
* https://svelte.dev/docs/svelte#getallcontexts
* @template {Map<any, any>} [T=Map<any, any>]
* @returns {T}
*/
export function getAllContexts() {
const context_map = get_or_init_context_map('getAllContexts');
if (DEV) {
const fn = component_context?.function;
if (fn) {
for (const value of context_map.values()) {
add_owner(value, fn, true);
}
}
}
return /** @type {T} */ (context_map);
}
/**
* @param {string} name
* @returns {Map<unknown, unknown>}
*/
function get_or_init_context_map(name) {
if (component_context === null) {
lifecycle_outside_component(name);
}
return (component_context.c ??= new Map(get_parent_context(component_context) || undefined));
}
/**
* @param {ComponentContext} component_context
* @returns {Map<unknown, unknown> | null}
*/
function get_parent_context(component_context) {
let parent = component_context.p;
while (parent !== null) {
const context_map = parent.c;
if (context_map !== null) {
return context_map;
}
parent = parent.p;
}
return null;
}
/**
* @param {Value<number>} signal
* @param {1 | -1} [d]
* @returns {number}
*/
export function update(signal, d = 1) {
var value = +get(signal);
set(signal, value + d);
return value;
}
/**
* @param {Value<number>} signal
* @param {1 | -1} [d]
* @returns {number}
*/
export function update_pre(signal, d = 1) {
return set(signal, +get(signal) + d);
}
/**
* @param {Record<string, unknown>} obj
* @param {string[]} keys
* @returns {Record<string, unknown>}
*/
export function exclude_from_object(obj, keys) {
/** @type {Record<string, unknown>} */
var result = {};
for (var key in obj) {
if (!keys.includes(key)) {
result[key] = obj[key];
}
}
return result;
}
/**
* @param {Record<string, unknown>} props
* @param {any} runes
* @param {Function} [fn]
* @returns {void}
*/
export function push(props, runes = false, fn) {
component_context = {
p: component_context,
c: null,
e: null,
m: false,
s: props,
x: null,
l: null
};
if (!runes) {
component_context.l = {
s: null,
u: null,
r1: [],
r2: source(false)
};
}
if (DEV) {
// component function
component_context.function = fn;
dev_current_component_function = fn;
}
}
/**
* @template {Record<string, any>} T
* @param {T} [component]
* @returns {T}
*/
export function pop(component) {
const context_stack_item = component_context;
if (context_stack_item !== null) {
if (component !== undefined) {
context_stack_item.x = component;
}
const component_effects = context_stack_item.e;
if (component_effects !== null) {
var previous_effect = active_effect;
var previous_reaction = active_reaction;
context_stack_item.e = null;
try {
for (var i = 0; i < component_effects.length; i++) {
var component_effect = component_effects[i];
set_active_effect(component_effect.effect);
set_active_reaction(component_effect.reaction);
effect(component_effect.fn);
}
} finally {
set_active_effect(previous_effect);
set_active_reaction(previous_reaction);
}
}
component_context = context_stack_item.p;
if (DEV) {
dev_current_component_function = context_stack_item.p?.function ?? null;
}
context_stack_item.m = true;
}
// Micro-optimization: Don't set .a above to the empty object
// so it can be garbage-collected when the return here is unused
return component || /** @type {T} */ ({});
}
/**
* Possibly traverse an object and read all its properties so that they're all reactive in case this is `$state`.
* Does only check first level of an object for performance reasons (heuristic should be good for 99% of all cases).
* @param {any} value
* @returns {void}
*/
export function deep_read_state(value) {
if (typeof value !== 'object' || !value || value instanceof EventTarget) {
return;
}
if (STATE_SYMBOL in value) {
deep_read(value);
} else if (!Array.isArray(value)) {
for (let key in value) {
const prop = value[key];
if (typeof prop === 'object' && prop && STATE_SYMBOL in prop) {
deep_read(prop);
}
}
}
}
/**
* Deeply traverse an object and read all its properties
* so that they're all reactive in case this is `$state`
* @param {any} value
* @param {Set<any>} visited
* @returns {void}
*/
export function deep_read(value, visited = new Set()) {
if (
typeof value === 'object' &&
value !== null &&
// We don't want to traverse DOM elements
!(value instanceof EventTarget) &&
!visited.has(value)
) {
visited.add(value);
// When working with a possible SvelteDate, this
// will ensure we capture changes to it.
if (value instanceof Date) {
value.getTime();
}
for (let key in value) {
try {
deep_read(value[key], visited);
} catch (e) {
// continue
}
}
const proto = get_prototype_of(value);
if (
proto !== Object.prototype &&
proto !== Array.prototype &&
proto !== Map.prototype &&
proto !== Set.prototype &&
proto !== Date.prototype
) {
const descriptors = get_descriptors(proto);
for (let key in descriptors) {
const get = descriptors[key].get;
if (get) {
try {
get.call(value);
} catch (e) {
// continue
}
}
}
}
}
}
if (DEV) {
/**
* @param {string} rune
*/
function throw_rune_error(rune) {
if (!(rune in globalThis)) {
// TODO if people start adjusting the "this can contain runes" config through v-p-s more, adjust this message
/** @type {any} */
let value; // let's hope noone modifies this global, but belts and braces
Object.defineProperty(globalThis, rune, {
configurable: true,
// eslint-disable-next-line getter-return
get: () => {
if (value !== undefined) {
return value;
}
e.rune_outside_svelte(rune);
},
set: (v) => {
value = v;
}
});
}
}
throw_rune_error('$state');
throw_rune_error('$effect');
throw_rune_error('$derived');
throw_rune_error('$inspect');
throw_rune_error('$props');
throw_rune_error('$bindable');
}
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