Press n or j to go to the next uncovered block, b, p or k for the previous block.
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2214x 2246x 2246x 2214x 6367x 6367x 6367x 6367x 6367x 6367x 6367x 2x 2x 2x 2x 2x 2x 2x 2x 3005x 651x 651x 2354x 3005x 116x 3005x 2156x 336x 336x 4x 4x 336x 2156x 3005x 2x 2x 2x 2x 2x 2x 2x 2x 2x 658x 658x 658x 336x 658x 336x 658x 332x 332x 504x 504x 504x 504x 332x 332x 332x 332x 332x 332x 332x 332x 658x 2x 2x 2x 2x 2x 2x 2x 64x 64x 36x 36x 20x 20x 20x 16x 16x 36x 16x 16x 16x 16x 18x 18x 18x 14x 14x 18x 16x 36x 36x 44x 64x 64x 2x 2x 2x 2x 2x 2x 2x 2x 2x 2x 16x 16x 16x 34x 36x 36x 36x 34x 34x 34x 34x 34x 34x 34x 34x 34x 34x 34x 16x 16x 16x 34x 34x 34x 101x 101x 34x 16x 16x 2x 2x 2x 2x 2x 2x 2x 21230x 14654x 14654x 14654x 6576x 6576x 6576x 2x 2x 2x 2x 2x 2x 54x 54x 54x 54x 54x 54x 54x 54x 54x 54x 54x 54x 2x 2x 2x 2x 2x 2x 2x 2x 2x 2x 2x 2x 2x 2x 2x 2x 18x 8x 8x 8x 8x 8x 18x 18x | import { DEV } from 'esm-env';
import {
array_prototype,
get_descriptors,
get_prototype_of,
is_frozen,
object_freeze,
object_prototype
} from './utils.js';
import { snapshot } from './proxy.js';
import {
destroy_effect,
effect,
execute_effect_teardown,
user_pre_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
} 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';
const FLUSH_MICROTASK = 0;
const FLUSH_SYNC = 1;
// Used for controlling the flush of effects.
let current_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;
}
// Used for $inspect
export let is_batching_effect = false;
let is_inspecting_signal = false;
// Handle effect queues
/** @type {import('./types.js').Effect[]} */
let current_queued_root_effects = [];
let flush_count = 0;
// Handle signal reactivity tree dependencies and reactions
/** @type {null | import('./types.js').Reaction} */
export let current_reaction = null;
/** @param {null | import('./types.js').Reaction} reaction */
export function set_current_reaction(reaction) {
current_reaction = reaction;
}
/** @type {null | import('./types.js').Effect} */
export let current_effect = null;
/** @param {null | import('./types.js').Effect} effect */
export function set_current_effect(effect) {
current_effect = effect;
}
/** @type {null | import('./types.js').Value[]} */
export let current_dependencies = null;
let current_dependencies_index = 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 | import('./types.js').Source[]}
*/
export let current_untracked_writes = null;
/** @param {null | import('./types.js').Source[]} value */
export function set_current_untracked_writes(value) {
current_untracked_writes = value;
}
/** @type {null | import('./types.js').ValueDebug} */
export let last_inspected_signal = null;
/** @param {null | import('./types.js').ValueDebug} signal */
export function set_last_inspected_signal(signal) {
last_inspected_signal = signal;
}
/** If `true`, `get`ting the signal should not register it as a dependency */
export let current_untracking = false;
// If we are working with a get() chain that has no active container,
// to prevent memory leaks, we skip adding the reaction.
export let current_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();
/** @type {Function | null} */
export let inspect_fn = null;
/** @type {Array<import('./types.js').ValueDebug>} */
let inspect_captured_signals = [];
// Handling runtime component context
/** @type {import('./types.js').ComponentContext | null} */
export let current_component_context = null;
/** @param {import('./types.js').ComponentContext | null} context */
export function set_current_component_context(context) {
current_component_context = context;
}
/** @returns {boolean} */
export function is_runes() {
return current_component_context !== null && current_component_context.r;
}
/**
* @param {import('./types.js').ProxyStateObject} target
* @param {string | symbol} prop
* @param {any} receiver
*/
export function batch_inspect(target, prop, receiver) {
const value = Reflect.get(target, prop, receiver);
/**
* @this {any}
*/
return function () {
const previously_batching_effect = is_batching_effect;
is_batching_effect = true;
try {
return Reflect.apply(value, this, arguments);
} finally {
is_batching_effect = previously_batching_effect;
if (last_inspected_signal !== null && !is_inspecting_signal) {
is_inspecting_signal = true;
try {
for (const fn of last_inspected_signal.inspect) {
fn();
}
} finally {
is_inspecting_signal = false;
}
last_inspected_signal = null;
}
}
};
}
/**
* Determines whether a derived or effect is dirty.
* If it is MAYBE_DIRTY, will set the status to CLEAN
* @param {import('./types.js').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 length = dependencies.length;
for (var i = 0; i < length; i++) {
var dependency = dependencies[i];
if (check_dirtiness(/** @type {import('#client').Derived} */ (dependency))) {
update_derived(/** @type {import('#client').Derived} **/ (dependency), true);
// `signal` might now be dirty, as a result of calling `update_derived`
if ((reaction.f & DIRTY) !== 0) {
return true;
}
}
// If we're working with an unowned derived signal, then we need to check
// if our dependency write version is higher. If it is then we can assume
// that state has changed to a newer version and thus this unowned signal
// is also dirty.
var version = dependency.version;
if (is_unowned) {
if (version > /** @type {import('#client').Derived} */ (reaction).version) {
/** @type {import('#client').Derived} */ (reaction).version = version;
return true;
} else if (!current_skip_reaction && !dependency?.reactions?.includes(reaction)) {
// If we are working with an unowned signal as part of an effect (due to !current_skip_reaction)
// and the version hasn't changed, we still need to check that this reaction
// if linked to the dependency source – otherwise future updates will not be caught.
var reactions = dependency.reactions;
if (reactions === null) {
dependency.reactions = [reaction];
} else {
reactions.push(reaction);
}
}
}
}
}
// Unowned signals are always maybe dirty, as we instead check their dependency versions.
if (!is_unowned) {
set_signal_status(reaction, CLEAN);
}
}
return false;
}
/**
* @template V
* @param {import('./types.js').Reaction} signal
* @returns {V}
*/
export function execute_reaction_fn(signal) {
const previous_dependencies = current_dependencies;
const previous_dependencies_index = current_dependencies_index;
const previous_untracked_writes = current_untracked_writes;
const previous_reaction = current_reaction;
const previous_skip_reaction = current_skip_reaction;
const previous_untracking = current_untracking;
current_dependencies = /** @type {null | import('./types.js').Value[]} */ (null);
current_dependencies_index = 0;
current_untracked_writes = null;
current_reaction = signal;
current_skip_reaction = !is_flushing_effect && (signal.f & UNOWNED) !== 0;
current_untracking = false;
try {
let res = signal.fn();
let dependencies = /** @type {import('./types.js').Value<unknown>[]} **/ (signal.deps);
if (current_dependencies !== null) {
let i;
if (dependencies !== null) {
const deps_length = dependencies.length;
// Include any dependencies up until the current_dependencies_index.
const full_current_dependencies =
current_dependencies_index === 0
? current_dependencies
: dependencies.slice(0, current_dependencies_index).concat(current_dependencies);
const current_dep_length = full_current_dependencies.length;
// If we have more than 16 elements in the array then use a Set for faster performance
// TODO: evaluate if we should always just use a Set or not here?
const full_current_dependencies_set =
current_dep_length > 16 && deps_length - current_dependencies_index > 1
? new Set(full_current_dependencies)
: null;
for (i = current_dependencies_index; i < deps_length; i++) {
const dependency = dependencies[i];
if (
full_current_dependencies_set !== null
? !full_current_dependencies_set.has(dependency)
: !full_current_dependencies.includes(dependency)
) {
remove_reaction(signal, dependency);
}
}
}
if (dependencies !== null && current_dependencies_index > 0) {
dependencies.length = current_dependencies_index + current_dependencies.length;
for (i = 0; i < current_dependencies.length; i++) {
dependencies[current_dependencies_index + i] = current_dependencies[i];
}
} else {
signal.deps = /** @type {import('./types.js').Value<V>[]} **/ (
dependencies = current_dependencies
);
}
if (!current_skip_reaction) {
for (i = current_dependencies_index; i < dependencies.length; i++) {
const dependency = dependencies[i];
const reactions = dependency.reactions;
if (reactions === null) {
dependency.reactions = [signal];
} else if (reactions[reactions.length - 1] !== signal) {
// TODO: should this be:
//
// } else if (!reactions.includes(signal)) {
//
reactions.push(signal);
}
}
}
} else if (dependencies !== null && current_dependencies_index < dependencies.length) {
remove_reactions(signal, current_dependencies_index);
dependencies.length = current_dependencies_index;
}
return res;
} finally {
current_dependencies = previous_dependencies;
current_dependencies_index = previous_dependencies_index;
current_untracked_writes = previous_untracked_writes;
current_reaction = previous_reaction;
current_skip_reaction = previous_skip_reaction;
current_untracking = previous_untracking;
}
}
/**
* @template V
* @param {import('./types.js').Reaction} signal
* @param {import('./types.js').Value<V>} dependency
* @returns {void}
*/
function remove_reaction(signal, dependency) {
const reactions = dependency.reactions;
let reactions_length = 0;
if (reactions !== null) {
reactions_length = reactions.length - 1;
const index = reactions.indexOf(signal);
if (index !== -1) {
if (reactions_length === 0) {
dependency.reactions = null;
} else {
// Swap with last element and then remove.
reactions[index] = reactions[reactions_length];
reactions.pop();
}
}
}
if (reactions_length === 0 && (dependency.f & UNOWNED) !== 0) {
// If the signal is unowned then we need to make sure to change it to dirty.
set_signal_status(dependency, DIRTY);
remove_reactions(/** @type {import('./types.js').Derived} **/ (dependency), 0);
}
}
/**
* @param {import('./types.js').Reaction} signal
* @param {number} start_index
* @returns {void}
*/
export function remove_reactions(signal, start_index) {
const dependencies = signal.deps;
if (dependencies !== null) {
const active_dependencies = start_index === 0 ? null : dependencies.slice(0, start_index);
let i;
for (i = start_index; i < dependencies.length; i++) {
const dependency = dependencies[i];
// Avoid removing a reaction if we know that it is active (start_index will not be 0)
if (active_dependencies === null || !active_dependencies.includes(dependency)) {
remove_reaction(signal, dependency);
}
}
}
}
/**
* @param {import('./types.js').Reaction} signal
* @returns {void}
*/
export function destroy_effect_children(signal) {
let effect = signal.first;
signal.first = null;
signal.last = null;
var sibling;
while (effect !== null) {
sibling = effect.next;
destroy_effect(effect);
effect = sibling;
}
}
/**
* @param {import('./types.js').Effect} effect
* @returns {void}
*/
export function execute_effect(effect) {
var flags = effect.f;
if ((flags & DESTROYED) !== 0) {
return;
}
set_signal_status(effect, CLEAN);
var component_context = effect.ctx;
var previous_effect = current_effect;
var previous_component_context = current_component_context;
current_effect = effect;
current_component_context = component_context;
try {
if ((flags & BLOCK_EFFECT) === 0) {
destroy_effect_children(effect);
}
execute_effect_teardown(effect);
var teardown = execute_reaction_fn(effect);
effect.teardown = typeof teardown === 'function' ? teardown : null;
} finally {
current_effect = previous_effect;
current_component_context = previous_component_context;
}
}
function infinite_loop_guard() {
if (flush_count > 1000) {
flush_count = 0;
throw new Error(
'ERR_SVELTE_TOO_MANY_UPDATES' +
(DEV
? ': Maximum update depth exceeded. This can happen when a reactive block or effect ' +
'repeatedly sets a new value. Svelte limits the number of nested updates to prevent infinite loops.'
: '')
);
}
flush_count++;
}
/**
* @param {Array<import('./types.js').Effect>} root_effects
* @returns {void}
*/
function flush_queued_root_effects(root_effects) {
for (var i = 0; i < root_effects.length; i++) {
var signal = root_effects[i];
flush_nested_effects(signal, RENDER_EFFECT | EFFECT);
}
}
/**
* @param {Array<import('./types.js').Effect>} effects
* @returns {void}
*/
function flush_queued_effects(effects) {
var length = effects.length;
if (length === 0) return;
infinite_loop_guard();
for (var i = 0; i < length; i++) {
var effect = effects[i];
if ((effect.f & (DESTROYED | INERT)) === 0 && check_dirtiness(effect)) {
execute_effect(effect);
}
}
}
function process_microtask() {
is_micro_task_queued = false;
if (flush_count > 101) {
return;
}
const previous_queued_root_effects = current_queued_root_effects;
current_queued_root_effects = [];
flush_queued_root_effects(previous_queued_root_effects);
if (!is_micro_task_queued) {
flush_count = 0;
}
}
/**
* @param {import('./types.js').Effect} signal
* @returns {void}
*/
export function schedule_effect(signal) {
if (current_scheduler_mode === FLUSH_MICROTASK) {
if (!is_micro_task_queued) {
is_micro_task_queued = true;
queueMicrotask(process_microtask);
}
}
var effect = signal;
while (effect.parent !== null) {
effect = effect.parent;
var flags = effect.f;
if ((flags & BRANCH_EFFECT) !== 0) {
if ((flags & CLEAN) === 0) return;
set_signal_status(effect, MAYBE_DIRTY);
}
}
current_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 {import('./types.js').Effect} effect
* @param {number} filter_flags
* @param {boolean} shallow
* @param {import('./types.js').Effect[]} collected_effects
* @returns {void}
*/
function process_effects(effect, filter_flags, shallow, collected_effects) {
var current_effect = effect.first;
var effects = [];
main_loop: while (current_effect !== null) {
var flags = current_effect.f;
// TODO: we probably don't need to check for destroyed as it shouldn't be encountered?
var is_active = (flags & (DESTROYED | INERT)) === 0;
var is_branch = flags & BRANCH_EFFECT;
var is_clean = (flags & CLEAN) !== 0;
var child = current_effect.first;
// Skip this branch if it's clean
if (is_active && (!is_branch || !is_clean)) {
if (is_branch) {
set_signal_status(current_effect, CLEAN);
}
if ((flags & RENDER_EFFECT) !== 0) {
if (is_branch) {
if (!shallow && child !== null) {
current_effect = child;
continue;
}
} else {
if (check_dirtiness(current_effect)) {
execute_effect(current_effect);
// Child might have been mutated since running the effect
child = current_effect.first;
}
if (!shallow && child !== null) {
current_effect = child;
continue;
}
}
} else if ((flags & EFFECT) !== 0) {
if (is_branch || is_clean) {
if (!shallow && child !== null) {
current_effect = child;
continue;
}
} else {
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;
}
if (effects.length > 0) {
if ((filter_flags & EFFECT) !== 0) {
collected_effects.push(...effects);
}
if (!shallow) {
for (var i = 0; i < effects.length; i++) {
process_effects(effects[i], filter_flags, false, collected_effects);
}
}
}
}
/**
*
* This function recursively collects 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
* array will be populated with all the effects.
*
* @param {import('./types.js').Effect} effect
* @param {number} filter_flags
* @param {boolean} [shallow]
* @returns {void}
*/
function flush_nested_effects(effect, filter_flags, shallow = false) {
/** @type {import('#client').Effect[]} */
var collected_effects = [];
var previously_flushing_effect = is_flushing_effect;
is_flushing_effect = true;
try {
// When working with custom elements, the root effects might not have a root
if (effect.first === null && (effect.f & BRANCH_EFFECT) === 0) {
flush_queued_effects([effect]);
} else {
process_effects(effect, filter_flags, shallow, collected_effects);
flush_queued_effects(collected_effects);
}
} finally {
is_flushing_effect = previously_flushing_effect;
}
}
/**
* @param {import('./types.js').Effect} effect
* @returns {void}
*/
export function flush_local_render_effects(effect) {
// We are entering a new flush sequence, so ensure counter is reset.
flush_count = 0;
flush_nested_effects(effect, RENDER_EFFECT, true);
}
/**
* Internal version of `flushSync` with the option to not flush previous effects.
* Returns the result of the passed function, if given.
* @param {() => any} [fn]
* @param {boolean} [flush_previous]
* @returns {any}
*/
export function flush_sync(fn, flush_previous = true) {
var previous_scheduler_mode = current_scheduler_mode;
var previous_queued_root_effects = current_queued_root_effects;
try {
infinite_loop_guard();
/** @type {import('./types.js').Effect[]} */
const root_effects = [];
current_scheduler_mode = FLUSH_SYNC;
current_queued_root_effects = root_effects;
if (flush_previous) {
flush_queued_root_effects(previous_queued_root_effects);
}
var result = fn?.();
flush_tasks();
if (current_queued_root_effects.length > 0 || root_effects.length > 0) {
flush_sync();
}
flush_count = 0;
return result;
} finally {
current_scheduler_mode = previous_scheduler_mode;
current_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 {import('./types.js').Value<V>} signal
* @returns {V}
*/
export function get(signal) {
// @ts-expect-error
if (DEV && signal.inspect && inspect_fn) {
/** @type {import('./types.js').ValueDebug} */ (signal).inspect.add(inspect_fn);
// @ts-expect-error
inspect_captured_signals.push(signal);
}
const 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 (
current_reaction !== null &&
(current_reaction.f & (BRANCH_EFFECT | ROOT_EFFECT)) === 0 &&
!current_untracking
) {
const unowned = (current_reaction.f & UNOWNED) !== 0;
const dependencies = current_reaction.deps;
if (
current_dependencies === null &&
dependencies !== null &&
dependencies[current_dependencies_index] === signal &&
!(unowned && current_effect !== null)
) {
current_dependencies_index++;
} else if (
dependencies === null ||
current_dependencies_index === 0 ||
dependencies[current_dependencies_index - 1] !== signal
) {
if (current_dependencies === null) {
current_dependencies = [signal];
} else {
current_dependencies.push(signal);
}
}
if (
current_untracked_writes !== null &&
current_effect !== null &&
(current_effect.f & CLEAN) !== 0 &&
(current_effect.f & BRANCH_EFFECT) === 0 &&
current_untracked_writes.includes(signal)
) {
set_signal_status(current_effect, DIRTY);
schedule_effect(current_effect);
}
}
if (
(flags & DERIVED) !== 0 &&
check_dirtiness(/** @type {import('#client').Derived} */ (signal))
) {
if (DEV) {
// we want to avoid tracking indirect dependencies
const previous_inspect_fn = inspect_fn;
inspect_fn = null;
update_derived(/** @type {import('./types.js').Derived} **/ (signal), false);
inspect_fn = previous_inspect_fn;
} else {
update_derived(/** @type {import('./types.js').Derived} **/ (signal), false);
}
}
return signal.v;
}
/**
* 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) {
mutate(signal, null /* doesnt matter */);
}
}
/**
* @param {import('#client').Value} signal
* @param {number} to_status
* @param {boolean} force_schedule
* @returns {void}
*/
export function mark_reactions(signal, to_status, force_schedule) {
var reactions = signal.reactions;
if (reactions === null) return;
var runes = is_runes();
var length = reactions.length;
for (var i = 0; i < length; i++) {
var reaction = reactions[i];
// We skip any effects that are already dirty (but not unowned). Additionally, we also
// skip if the reaction is the same as the current effect (except if we're not in runes or we
// are in force schedule mode).
if ((!force_schedule || !runes) && reaction === current_effect) {
continue;
}
var flags = reaction.f;
set_signal_status(reaction, to_status);
// If the signal is not clean, then skip over it – with the exception of unowned signals that
// are already maybe dirty. Unowned signals might be dirty because they are not captured as part of an
// effect.
var maybe_dirty = (flags & MAYBE_DIRTY) !== 0;
var unowned = (flags & UNOWNED) !== 0;
if ((flags & CLEAN) !== 0 || (maybe_dirty && unowned)) {
if ((reaction.f & DERIVED) !== 0) {
mark_reactions(
/** @type {import('#client').Derived} */ (reaction),
MAYBE_DIRTY,
force_schedule
);
} else {
schedule_effect(/** @type {import('#client').Effect} */ (reaction));
}
}
}
}
/**
* 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_untracking = current_untracking;
try {
current_untracking = true;
return fn();
} finally {
current_untracking = previous_untracking;
}
}
const STATUS_MASK = ~(DIRTY | MAYBE_DIRTY | CLEAN);
/**
* @param {import('./types.js').Signal} signal
* @param {number} status
* @returns {void}
*/
export function set_signal_status(signal, status) {
signal.f = (signal.f & STATUS_MASK) | status;
}
/**
* @template V
* @param {V | import('./types.js').Value<V>} val
* @returns {val is import('./types.js').Value<V>}
*/
export function is_signal(val) {
return (
typeof val === 'object' &&
val !== null &&
typeof (/** @type {import('./types.js').Value<V>} */ (val).f) === 'number'
);
}
/**
* 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();
const result = /** @type {T} */ (context_map.get(key));
if (DEV) {
// @ts-expect-error
const fn = current_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();
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();
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();
if (DEV) {
// @ts-expect-error
const fn = current_component_context?.function;
if (fn) {
for (const value of context_map.values()) {
add_owner(value, fn, true);
}
}
}
return /** @type {T} */ (context_map);
}
/** @returns {Map<unknown, unknown>} */
function get_or_init_context_map() {
const component_context = current_component_context;
if (component_context === null) {
throw new Error(
'ERR_SVELTE_ORPHAN_CONTEXT' +
(DEV ? 'Context can only be used during component initialisation.' : '')
);
}
return (component_context.c ??= new Map(get_parent_context(component_context) || undefined));
}
/**
* @param {import('./types.js').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 {import('./types.js').Value<number>} signal
* @param {1 | -1} [d]
* @returns {number}
*/
export function update(signal, d = 1) {
const value = get(signal);
set(signal, value + d);
return value;
}
/**
* @param {import('./types.js').Value<number>} signal
* @param {1 | -1} [d]
* @returns {number}
*/
export function update_pre(signal, d = 1) {
const value = get(signal) + d;
set(signal, value);
return value;
}
/**
* @param {Record<string, unknown>} obj
* @param {string[]} keys
* @returns {Record<string, unknown>}
*/
export function exclude_from_object(obj, keys) {
obj = { ...obj };
let key;
for (key of keys) {
delete obj[key];
}
return obj;
}
/**
* @template V
* @param {V} value
* @param {() => V} fallback lazy because could contain side effects
* @returns {V}
*/
export function value_or_fallback(value, fallback) {
return value === undefined ? fallback() : value;
}
/**
* @template V
* @param {V} value
* @param {() => Promise<V>} fallback lazy because could contain side effects
* @returns {Promise<V>}
*/
export async function value_or_fallback_async(value, fallback) {
return value === undefined ? fallback() : value;
}
/**
* @param {Record<string, unknown>} props
* @param {any} runes
* @param {Function} [fn]
* @returns {void}
*/
export function push(props, runes = false, fn) {
current_component_context = {
// exports (and props, if `accessors: true`)
x: null,
// context
c: null,
// effects
e: null,
// mounted
m: false,
// parent
p: current_component_context,
// signals
d: null,
// props
s: props,
// runes
r: runes,
// legacy $:
l1: [],
l2: source(false),
// update_callbacks
u: null
};
if (DEV) {
// component function
// @ts-expect-error
current_component_context.function = fn;
}
}
/**
* @template {Record<string, any>} T
* @param {T} [component]
* @returns {T}
*/
export function pop(component) {
const context_stack_item = current_component_context;
if (context_stack_item !== null) {
if (component !== undefined) {
context_stack_item.x = component;
}
const effects = context_stack_item.e;
if (effects !== null) {
context_stack_item.e = null;
for (let i = 0; i < effects.length; i++) {
effect(effects[i]);
}
}
current_component_context = context_stack_item.p;
context_stack_item.m = true;
}
// Micro-optimization: Don't set .a above to the empty object
// so it can be garbage-collected when the return here is unused
return component || /** @type {T} */ ({});
}
/**
* Possibly traverse an object and read all its properties so that they're all reactive in case this is `$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);
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
}
}
}
}
}
}
/**
* Like `snapshot`, but recursively traverses into normal arrays/objects to find potential states in them.
* @param {any} value
* @param {Map<any, any>} visited
* @returns {any}
*/
function deep_snapshot(value, visited = new Map()) {
if (typeof value === 'object' && value !== null && !visited.has(value)) {
const unstated = snapshot(value);
if (unstated !== value) {
visited.set(value, unstated);
return unstated;
}
const prototype = get_prototype_of(value);
// Only deeply snapshot plain objects and arrays
if (prototype === object_prototype || prototype === array_prototype) {
let contains_unstated = false;
/** @type {any} */
const nested_unstated = Array.isArray(value) ? [] : {};
for (let key in value) {
const result = deep_snapshot(value[key], visited);
nested_unstated[key] = result;
if (result !== value[key]) {
contains_unstated = true;
}
}
visited.set(value, contains_unstated ? nested_unstated : value);
} else {
visited.set(value, value);
}
}
return visited.get(value) ?? value;
}
// TODO remove in a few versions, before 5.0 at the latest
let warned_inspect_changed = false;
/**
* @param {() => any[]} get_value
* @param {Function} [inspect]
*/
// eslint-disable-next-line no-console
export function inspect(get_value, inspect = console.log) {
let initial = true;
user_pre_effect(() => {
const fn = () => {
const value = untrack(() => get_value().map((v) => deep_snapshot(v)));
if (value.length === 2 && typeof value[1] === 'function' && !warned_inspect_changed) {
// eslint-disable-next-line no-console
console.warn(
'$inspect() API has changed. See https://svelte-5-preview.vercel.app/docs/runes#$inspect for more information.'
);
warned_inspect_changed = true;
}
inspect(initial ? 'init' : 'update', ...value);
};
inspect_fn = fn;
const value = get_value();
deep_read(value);
inspect_fn = null;
const signals = inspect_captured_signals.slice();
inspect_captured_signals = [];
if (initial) {
fn();
initial = false;
}
return () => {
for (const s of signals) {
s.inspect.delete(fn);
}
};
});
}
/**
* @template V
* @param {V | import('#client').Value<V>} value
* @returns {V}
*/
export function unwrap(value) {
if (is_signal(value)) {
// @ts-ignore
return get(value);
}
// @ts-ignore
return value;
}
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,
get: () => {
if (value !== undefined) {
return value;
}
throw new Error(
`The ${rune} rune is only available inside .svelte and .svelte.js/ts files`
);
},
set: (v) => {
value = v;
}
});
}
}
throw_rune_error('$state');
throw_rune_error('$effect');
throw_rune_error('$derived');
throw_rune_error('$inspect');
throw_rune_error('$props');
throw_rune_error('$bindable');
}
/**
* Expects a value that was wrapped with `freeze` and makes it frozen.
* @template T
* @param {T} value
* @returns {Readonly<T>}
*/
export function freeze(value) {
if (typeof value === 'object' && value != null && !is_frozen(value)) {
// If the object is already proxified, then snapshot the value
if (STATE_SYMBOL in value) {
return object_freeze(snapshot(value));
}
// Otherwise freeze the object
object_freeze(value);
}
return value;
}
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