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new Set(prev_owners) : null; } else { metadata.owners = parent === null ? component_context !== null ? new Set([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); // In case of something like `foo = bar.map(...)`, foo would have ownership // of the array itself, while the individual items would have ownership // of the component that created bar. That means if we later do `foo[0].baz = 42`, // we could get a false-positive ownership violation, since the two proxies // are not connected to each other via the parent metadata relationship. // For this reason, we need to widen the ownership of the children // upon access when we detect they are not connected. if (DEV) { /** @type {ProxyMetadata | undefined} */ var prop_metadata = v?.[STATE_SYMBOL_METADATA]; if (prop_metadata && prop_metadata?.parent !== metadata) { widen_ownership(metadata, prop_metadata); } } 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 || (active_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)); } |