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import { DEV } from 'esm-env';
import { get, current_component_context, untrack, current_effect } from './runtime.js';
import {
array_prototype,
get_descriptor,
get_prototype_of,
is_array,
object_prototype
} from '../shared/utils.js';
import { check_ownership, widen_ownership } from './dev/ownership.js';
import { source, set } from './reactivity/sources.js';
import { STATE_SYMBOL, STATE_SYMBOL_METADATA } from './constants.js';
import { UNINITIALIZED } from '../../constants.js';
import * as e from './errors.js';
/**
* @template T
* @param {T} value
* @param {ProxyMetadata | null} [parent]
* @param {Source<T>} [prev] dev mode only
* @returns {T}
*/
export function proxy(value, parent = null, prev) {
// if non-proxyable, or is already a proxy, return `value`
if (typeof value !== 'object' || value === null || STATE_SYMBOL in value) {
return value;
}
const prototype = get_prototype_of(value);
if (prototype !== object_prototype && prototype !== array_prototype) {
return value;
}
/** @type {Map<any, Source<any>>} */
var sources = new Map();
var is_proxied_array = is_array(value);
var version = source(0);
if (is_proxied_array) {
// We need to create the length source eagerly to ensure that
// mutations to the array are properly synced with our proxy
sources.set('length', source(/** @type {any[]} */ (value).length));
}
/** @type {ProxyMetadata} */
var metadata;
if (DEV) {
metadata = {
parent,
owners: null
};
if (prev) {
// Reuse owners from previous state; necessary because reassignment is not guaranteed to have correct component context.
// If no previous proxy exists we play it safe and assume ownerless state
// @ts-expect-error
const prev_owners = prev.v?.[STATE_SYMBOL_METADATA]?.owners;
metadata.owners = prev_owners ? new Set(prev_owners) : null;
} else {
metadata.owners =
parent === null
? current_component_context !== null
? new Set([current_component_context.function])
: null
: new Set();
}
}
return new Proxy(/** @type {any} */ (value), {
defineProperty(_, prop, descriptor) {
if (
!('value' in descriptor) ||
descriptor.configurable === false ||
descriptor.enumerable === false ||
descriptor.writable === false
) {
// we disallow non-basic descriptors, because unless they are applied to the
// target object — which we avoid, so that state can be forked — we will run
// afoul of the various invariants
// https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/Proxy/Proxy/getOwnPropertyDescriptor#invariants
e.state_descriptors_fixed();
}
var s = sources.get(prop);
if (s === undefined) {
s = source(descriptor.value);
sources.set(prop, s);
} else {
set(s, proxy(descriptor.value, metadata));
}
return true;
},
deleteProperty(target, prop) {
var s = sources.get(prop);
if (s === undefined) {
if (prop in target) {
sources.set(prop, source(UNINITIALIZED));
}
} else {
set(s, UNINITIALIZED);
update_version(version);
}
return true;
},
get(target, prop, receiver) {
if (DEV && prop === STATE_SYMBOL_METADATA) {
return metadata;
}
if (prop === STATE_SYMBOL) {
return value;
}
var s = sources.get(prop);
var exists = prop in target;
// create a source, but only if it's an own property and not a prototype property
if (s === undefined && (!exists || get_descriptor(target, prop)?.writable)) {
s = source(proxy(exists ? target[prop] : UNINITIALIZED, metadata));
sources.set(prop, s);
}
if (s !== undefined) {
var v = get(s);
return v === UNINITIALIZED ? undefined : v;
}
return Reflect.get(target, prop, receiver);
},
getOwnPropertyDescriptor(target, prop) {
var descriptor = Reflect.getOwnPropertyDescriptor(target, prop);
if (descriptor && 'value' in descriptor) {
var s = sources.get(prop);
if (s) descriptor.value = get(s);
} else if (descriptor === undefined) {
var source = sources.get(prop);
var value = source?.v;
if (source !== undefined && value !== UNINITIALIZED) {
return {
enumerable: true,
configurable: true,
value,
writable: true
};
}
}
return descriptor;
},
has(target, prop) {
if (DEV && prop === STATE_SYMBOL_METADATA) {
return true;
}
if (prop === STATE_SYMBOL) {
return true;
}
var s = sources.get(prop);
var has = (s !== undefined && s.v !== UNINITIALIZED) || Reflect.has(target, prop);
if (
s !== undefined ||
(current_effect !== null && (!has || get_descriptor(target, prop)?.writable))
) {
if (s === undefined) {
s = source(has ? proxy(target[prop], metadata) : UNINITIALIZED);
sources.set(prop, s);
}
var value = get(s);
if (value === UNINITIALIZED) {
return false;
}
}
return has;
},
set(target, prop, value, receiver) {
var s = sources.get(prop);
var has = prop in target;
// variable.length = value -> clear all signals with index >= value
if (is_proxied_array && prop === 'length') {
for (var i = value; i < /** @type {Source<number>} */ (s).v; i += 1) {
var other_s = sources.get(i + '');
if (other_s !== undefined) {
set(other_s, UNINITIALIZED);
} else if (i in target) {
// If the item exists in the original, we need to create a uninitialized source,
// else a later read of the property would result in a source being created with
// the value of the original item at that index.
other_s = source(UNINITIALIZED);
sources.set(i + '', other_s);
}
}
}
// If we haven't yet created a source for this property, we need to ensure
// we do so otherwise if we read it later, then the write won't be tracked and
// the heuristics of effects will be different vs if we had read the proxied
// object property before writing to that property.
if (s === undefined) {
if (!has || get_descriptor(target, prop)?.writable) {
s = source(undefined);
set(s, proxy(value, metadata));
sources.set(prop, s);
}
} else {
has = s.v !== UNINITIALIZED;
set(s, proxy(value, metadata));
}
if (DEV) {
/** @type {ProxyMetadata | undefined} */
var prop_metadata = value?.[STATE_SYMBOL_METADATA];
if (prop_metadata && prop_metadata?.parent !== metadata) {
widen_ownership(metadata, prop_metadata);
}
check_ownership(metadata);
}
var descriptor = Reflect.getOwnPropertyDescriptor(target, prop);
// Set the new value before updating any signals so that any listeners get the new value
if (descriptor?.set) {
descriptor.set.call(receiver, value);
}
if (!has) {
// If we have mutated an array directly, we might need to
// signal that length has also changed. Do it before updating metadata
// to ensure that iterating over the array as a result of a metadata update
// will not cause the length to be out of sync.
if (is_proxied_array && typeof prop === 'string') {
var ls = /** @type {Source<number>} */ (sources.get('length'));
var n = Number(prop);
if (Number.isInteger(n) && n >= ls.v) {
set(ls, n + 1);
}
}
update_version(version);
}
return true;
},
ownKeys(target) {
get(version);
var own_keys = Reflect.ownKeys(target).filter((key) => {
var source = sources.get(key);
return source === undefined || source.v !== UNINITIALIZED;
});
for (var [key, source] of sources) {
if (source.v !== UNINITIALIZED && !(key in target)) {
own_keys.push(key);
}
}
return own_keys;
},
setPrototypeOf() {
e.state_prototype_fixed();
}
});
}
/**
* @param {Source<number>} signal
* @param {1 | -1} [d]
*/
function update_version(signal, d = 1) {
set(signal, signal.v + d);
}
/**
* @param {any} value
*/
export function get_proxied_value(value) {
if (value !== null && typeof value === 'object' && STATE_SYMBOL in value) {
return value[STATE_SYMBOL];
}
return value;
}
/**
* @param {any} a
* @param {any} b
*/
export function is(a, b) {
return Object.is(get_proxied_value(a), get_proxied_value(b));
}
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