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Created April 8, 2024 03:20
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Signals proposal polyfill bundled with Deno
// vendor/esm.sh/v135/signal-polyfill@0.1.0/denonext/signal-polyfill.mjs
var $ = function(e, o) {
return Object.is(e, o);
};
var N = function(e) {
let o = i;
return i = e, o;
};
var ce = function() {
return i;
};
var se = function() {
return T;
};
var W = function(e) {
if (T)
throw new Error(typeof ngDevMode < "u" && ngDevMode ? "Assertion error: signal read during notification phase" : "");
if (i === null)
return;
i.consumerOnSignalRead(e);
let o = i.nextProducerIndex++;
if (C(i), o < i.producerNode.length && i.producerNode[o] !== e && b(i)) {
let r = i.producerNode[o];
R(r, i.producerIndexOfThis[o]);
}
i.producerNode[o] !== e && (i.producerNode[o] = e, i.producerIndexOfThis[o] = b(i) ? F(e, i, o) : 0), i.producerLastReadVersion[o] = e.version;
};
var de = function() {
I++;
};
var z = function(e) {
if (!(b(e) && !e.dirty) && !(!e.dirty && e.lastCleanEpoch === I)) {
if (!e.producerMustRecompute(e) && !fe(e)) {
e.dirty = false, e.lastCleanEpoch = I;
return;
}
e.producerRecomputeValue(e), e.dirty = false, e.lastCleanEpoch = I;
}
};
var B = function(e) {
if (e.liveConsumerNode === undefined)
return;
let o = T;
T = true;
try {
for (let r of e.liveConsumerNode)
r.dirty || ae(r);
} finally {
T = o;
}
};
var le = function() {
return i?.consumerAllowSignalWrites !== false;
};
var ae = function(e) {
var o;
e.dirty = true, B(e), (o = e.consumerMarkedDirty) == null || o.call(e, e);
};
var pe = function(e) {
return e && (e.nextProducerIndex = 0), N(e);
};
var he = function(e, o) {
if (N(o), !(!e || e.producerNode === undefined || e.producerIndexOfThis === undefined || e.producerLastReadVersion === undefined)) {
if (b(e))
for (let r = e.nextProducerIndex;r < e.producerNode.length; r++)
R(e.producerNode[r], e.producerIndexOfThis[r]);
for (;e.producerNode.length > e.nextProducerIndex; )
e.producerNode.pop(), e.producerLastReadVersion.pop(), e.producerIndexOfThis.pop();
}
};
var fe = function(e) {
C(e);
for (let o = 0;o < e.producerNode.length; o++) {
let r = e.producerNode[o], d = e.producerLastReadVersion[o];
if (d !== r.version || (z(r), d !== r.version))
return true;
}
return false;
};
var F = function(e, o, r) {
var d;
if (D(e), C(e), e.liveConsumerNode.length === 0) {
(d = e.watched) == null || d.call(e.wrapper);
for (let c = 0;c < e.producerNode.length; c++)
e.producerIndexOfThis[c] = F(e.producerNode[c], e, c);
}
return e.liveConsumerIndexOfThis.push(r), e.liveConsumerNode.push(o) - 1;
};
var R = function(e, o) {
var r;
if (D(e), C(e), typeof ngDevMode < "u" && ngDevMode && o >= e.liveConsumerNode.length)
throw new Error(`Assertion error: active consumer index ${o} is out of bounds of ${e.liveConsumerNode.length} consumers)`);
if (e.liveConsumerNode.length === 1) {
(r = e.unwatched) == null || r.call(e.wrapper);
for (let c = 0;c < e.producerNode.length; c++)
R(e.producerNode[c], e.producerIndexOfThis[c]);
}
let d = e.liveConsumerNode.length - 1;
if (e.liveConsumerNode[o] = e.liveConsumerNode[d], e.liveConsumerIndexOfThis[o] = e.liveConsumerIndexOfThis[d], e.liveConsumerNode.length--, e.liveConsumerIndexOfThis.length--, o < e.liveConsumerNode.length) {
let c = e.liveConsumerIndexOfThis[o], m = e.liveConsumerNode[o];
C(m), m.producerIndexOfThis[c] = o;
}
};
var b = function(e) {
var o;
return e.consumerIsAlwaysLive || (((o = e?.liveConsumerNode) == null ? undefined : o.length) ?? 0) > 0;
};
var C = function(e) {
e.producerNode ?? (e.producerNode = []), e.producerIndexOfThis ?? (e.producerIndexOfThis = []), e.producerLastReadVersion ?? (e.producerLastReadVersion = []);
};
var D = function(e) {
e.liveConsumerNode ?? (e.liveConsumerNode = []), e.liveConsumerIndexOfThis ?? (e.liveConsumerIndexOfThis = []);
};
var H = function(e) {
if (z(e), W(e), e.value === O)
throw e.error;
return e.value;
};
var ve = function(e) {
let o = Object.create(we);
o.computation = e;
let r = () => H(o);
return r[E] = o, r;
};
var me = function() {
throw new Error;
};
var ye = function() {
ge();
};
var Ne = function(e) {
let o = Object.create(xe);
o.value = e;
let r = () => (W(o), o.value);
return r[E] = o, r;
};
var Ce = function() {
return W(this), this.value;
};
var Te = function(e, o) {
le() || ye(), e.equal.call(e.wrapper, e.value, o) || (e.value = o, Se(e));
};
var Se = function(e) {
e.version++, de(), B(e);
};
var ne = Object.defineProperty;
var ue = (e, o, r) => (o in e) ? ne(e, o, { enumerable: true, configurable: true, writable: true, value: r }) : e[o] = r;
var L = (e, o, r) => (ue(e, typeof o != "symbol" ? o + "" : o, r), r);
var ie = (e, o, r) => {
if (!o.has(e))
throw TypeError("Cannot " + r);
};
var M = (e, o) => {
if (Object(o) !== o)
throw TypeError('Cannot use the "in" operator on this value');
return e.has(o);
};
var S = (e, o, r) => {
if (o.has(e))
throw TypeError("Cannot add the same private member more than once");
o instanceof WeakSet ? o.add(e) : o.set(e, r);
};
var G = (e, o, r) => (ie(e, o, "access private method"), r);
var i = null;
var T = false;
var I = 1;
var E = Symbol("SIGNAL");
var V = { version: 0, lastCleanEpoch: 0, dirty: false, producerNode: undefined, producerLastReadVersion: undefined, producerIndexOfThis: undefined, nextProducerIndex: 0, liveConsumerNode: undefined, liveConsumerIndexOfThis: undefined, consumerAllowSignalWrites: false, consumerIsAlwaysLive: false, producerMustRecompute: () => false, producerRecomputeValue: () => {
}, consumerMarkedDirty: () => {
}, consumerOnSignalRead: () => {
} };
var A = Symbol("UNSET");
var P = Symbol("COMPUTING");
var O = Symbol("ERRORED");
var we = { ...V, value: A, dirty: true, error: null, equal: $, producerMustRecompute(e) {
return e.value === A || e.value === P;
}, producerRecomputeValue(e) {
if (e.value === P)
throw new Error("Detected cycle in computations.");
let o = e.value;
e.value = P;
let r = pe(e), d;
try {
d = e.computation.call(e.wrapper);
} catch (c) {
d = O, e.error = c;
} finally {
he(e, r);
}
if (o !== A && o !== O && d !== O && e.equal.call(e.wrapper, o, d)) {
e.value = o;
return;
}
e.value = d, e.version++;
} };
var ge = me;
var xe = { ...V, equal: $, value: undefined };
var s = Symbol("node");
var g;
var w;
var y;
var U;
((e) => {
var o, r, d, c, m, J;
class K {
constructor(v, a = {}) {
S(this, r), L(this, o);
let h = Ne(v)[E];
if (this[s] = h, h.wrapper = this, a) {
let f = a.equals;
f && (h.equal = f), h.watched = a[e.subtle.watched], h.unwatched = a[e.subtle.unwatched];
}
}
get() {
if (!g(this))
throw new TypeError("Wrong receiver type for Signal.State.prototype.get");
return Ce.call(this[s]);
}
set(v) {
if (!g(this))
throw new TypeError("Wrong receiver type for Signal.State.prototype.set");
if (se())
throw new Error("Writes to signals not permitted during Watcher callback");
let a = this[s];
Te(a, v);
}
}
o = s, r = new WeakSet, d = function() {
}, g = (l) => M(r, l), e.State = K;
class Q {
constructor(v, a) {
S(this, m), L(this, c);
let h = ve(v)[E];
if (h.consumerAllowSignalWrites = true, this[s] = h, h.wrapper = this, a) {
let f = a.equals;
f && (h.equal = f), h.watched = a[e.subtle.watched], h.unwatched = a[e.subtle.unwatched];
}
}
get() {
if (!w(this))
throw new TypeError("Wrong receiver type for Signal.Computed.prototype.get");
return H(this[s]);
}
}
c = s, m = new WeakSet, J = function() {
}, w = (l) => M(m, l), e.Computed = Q, ((l) => {
var v, a, h, f, k;
function X(u) {
let n, t = null;
try {
t = N(null), n = u();
} finally {
N(t);
}
return n;
}
l.untrack = X;
function Y(u) {
var n;
if (!w(u) && !y(u))
throw new TypeError("Called introspectSources without a Computed or Watcher argument");
return ((n = u[s].producerNode) == null ? undefined : n.map((t) => t.wrapper)) ?? [];
}
l.introspectSources = Y;
function Z(u) {
var n;
if (!w(u) && !g(u))
throw new TypeError("Called introspectSinks without a Signal argument");
return ((n = u[s].liveConsumerNode) == null ? undefined : n.map((t) => t.wrapper)) ?? [];
}
l.introspectSinks = Z;
function _(u) {
if (!w(u) && !g(u))
throw new TypeError("Called hasSinks without a Signal argument");
let n = u[s].liveConsumerNode;
return n ? n.length > 0 : false;
}
l.hasSinks = _;
function ee(u) {
if (!w(u) && !y(u))
throw new TypeError("Called hasSources without a Computed or Watcher argument");
let n = u[s].producerNode;
return n ? n.length > 0 : false;
}
l.hasSources = ee;
class oe {
constructor(n) {
S(this, a), S(this, f), L(this, v);
let t = Object.create(V);
t.wrapper = this, t.consumerMarkedDirty = n, t.consumerIsAlwaysLive = true, t.consumerAllowSignalWrites = false, t.producerNode = [], this[s] = t;
}
watch(...n) {
if (!y(this))
throw new TypeError("Called unwatch without Watcher receiver");
G(this, f, k).call(this, n);
let t = this[s];
t.dirty = false;
let x = N(t);
for (let p of n)
W(p[s]);
N(x);
}
unwatch(...n) {
if (!y(this))
throw new TypeError("Called unwatch without Watcher receiver");
G(this, f, k).call(this, n);
let t = this[s];
C(t);
let x = [];
for (let p = 0;p < t.producerNode.length; p++)
n.includes(t.producerNode[p].wrapper) && (R(t.producerNode[p], t.producerIndexOfThis[p]), x.push(p));
for (let p of x) {
let q = t.producerNode.length - 1;
if (t.producerNode[p] = t.producerNode[q], t.producerIndexOfThis[p] = t.producerIndexOfThis[q], t.producerNode.length--, t.producerIndexOfThis.length--, t.nextProducerIndex--, p < t.producerNode.length) {
let te = t.producerIndexOfThis[p], j = t.producerNode[p];
D(j), j.liveConsumerIndexOfThis[te] = p;
}
}
}
getPending() {
if (!y(this))
throw new TypeError("Called getPending without Watcher receiver");
return this[s].producerNode.filter((n) => n.dirty).map((n) => n.wrapper);
}
}
v = s, a = new WeakSet, h = function() {
}, f = new WeakSet, k = function(u) {
for (let n of u)
if (!w(n) && !g(n))
throw new TypeError("Called watch/unwatch without a Computed or State argument");
}, y = (u) => M(a, u), l.Watcher = oe;
function re() {
var u;
return (u = ce()) == null ? undefined : u.wrapper;
}
l.currentComputed = re, l.watched = Symbol("watched"), l.unwatched = Symbol("unwatched");
})(e.subtle || (e.subtle = {}));
})(U || (U = {}));
/*! Bundled license information:
signal-polyfill/dist/index.js:
(**
* @license
* Copyright Google LLC All Rights Reserved.
*
* Use of this source code is governed by an MIT-style license that can be
* found in the LICENSE file at https://angular.io/license
*)
(**
* @license
* Copyright 2024 Bloomberg Finance L.P.
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*)
*/
export {
U as Signal
};
// deno-fmt-ignore-file
// deno-lint-ignore-file
// This code was bundled using `deno bundle` and it's not recommended to edit it manually
var ne = Object.defineProperty, ue = (e, o, r)=>o in e ? ne(e, o, {
enumerable: !0,
configurable: !0,
writable: !0,
value: r
}) : e[o] = r, L = (e, o, r)=>(ue(e, typeof o != "symbol" ? o + "" : o, r), r), ie = (e, o, r)=>{
if (!o.has(e)) throw TypeError("Cannot " + r);
}, M = (e, o)=>{
if (Object(o) !== o) throw TypeError('Cannot use the "in" operator on this value');
return e.has(o);
}, S = (e, o, r)=>{
if (o.has(e)) throw TypeError("Cannot add the same private member more than once");
o instanceof WeakSet ? o.add(e) : o.set(e, r);
}, G = (e, o, r)=>(ie(e, o, "access private method"), r);
function $(e, o) {
return Object.is(e, o);
}
var i = null, T = !1, I = 1, E = Symbol("SIGNAL");
function N(e) {
let o = i;
return i = e, o;
}
function ce() {
return i;
}
function se() {
return T;
}
var V = {
version: 0,
lastCleanEpoch: 0,
dirty: !1,
producerNode: void 0,
producerLastReadVersion: void 0,
producerIndexOfThis: void 0,
nextProducerIndex: 0,
liveConsumerNode: void 0,
liveConsumerIndexOfThis: void 0,
consumerAllowSignalWrites: !1,
consumerIsAlwaysLive: !1,
producerMustRecompute: ()=>!1,
producerRecomputeValue: ()=>{},
consumerMarkedDirty: ()=>{},
consumerOnSignalRead: ()=>{}
};
function W(e) {
if (T) throw new Error(typeof ngDevMode < "u" && ngDevMode ? "Assertion error: signal read during notification phase" : "");
if (i === null) return;
i.consumerOnSignalRead(e);
let o = i.nextProducerIndex++;
if (C(i), o < i.producerNode.length && i.producerNode[o] !== e && b(i)) {
let r = i.producerNode[o];
R(r, i.producerIndexOfThis[o]);
}
i.producerNode[o] !== e && (i.producerNode[o] = e, i.producerIndexOfThis[o] = b(i) ? F(e, i, o) : 0), i.producerLastReadVersion[o] = e.version;
}
function de() {
I++;
}
function z(e) {
if (!(b(e) && !e.dirty) && !(!e.dirty && e.lastCleanEpoch === I)) {
if (!e.producerMustRecompute(e) && !fe(e)) {
e.dirty = !1, e.lastCleanEpoch = I;
return;
}
e.producerRecomputeValue(e), e.dirty = !1, e.lastCleanEpoch = I;
}
}
function B(e) {
if (e.liveConsumerNode === void 0) return;
let o = T;
T = !0;
try {
for (let r of e.liveConsumerNode)r.dirty || ae(r);
} finally{
T = o;
}
}
function le() {
return i?.consumerAllowSignalWrites !== !1;
}
function ae(e) {
var o;
e.dirty = !0, B(e), (o = e.consumerMarkedDirty) == null || o.call(e, e);
}
function pe(e) {
return e && (e.nextProducerIndex = 0), N(e);
}
function he(e, o) {
if (N(o), !(!e || e.producerNode === void 0 || e.producerIndexOfThis === void 0 || e.producerLastReadVersion === void 0)) {
if (b(e)) for(let r = e.nextProducerIndex; r < e.producerNode.length; r++)R(e.producerNode[r], e.producerIndexOfThis[r]);
for(; e.producerNode.length > e.nextProducerIndex;)e.producerNode.pop(), e.producerLastReadVersion.pop(), e.producerIndexOfThis.pop();
}
}
function fe(e) {
C(e);
for(let o = 0; o < e.producerNode.length; o++){
let r = e.producerNode[o], d = e.producerLastReadVersion[o];
if (d !== r.version || (z(r), d !== r.version)) return !0;
}
return !1;
}
function F(e, o, r) {
var d;
if (D(e), C(e), e.liveConsumerNode.length === 0) {
(d = e.watched) == null || d.call(e.wrapper);
for(let c = 0; c < e.producerNode.length; c++)e.producerIndexOfThis[c] = F(e.producerNode[c], e, c);
}
return e.liveConsumerIndexOfThis.push(r), e.liveConsumerNode.push(o) - 1;
}
function R(e, o) {
var r;
if (D(e), C(e), typeof ngDevMode < "u" && ngDevMode && o >= e.liveConsumerNode.length) throw new Error(`Assertion error: active consumer index ${o} is out of bounds of ${e.liveConsumerNode.length} consumers)`);
if (e.liveConsumerNode.length === 1) {
(r = e.unwatched) == null || r.call(e.wrapper);
for(let c = 0; c < e.producerNode.length; c++)R(e.producerNode[c], e.producerIndexOfThis[c]);
}
let d = e.liveConsumerNode.length - 1;
if (e.liveConsumerNode[o] = e.liveConsumerNode[d], e.liveConsumerIndexOfThis[o] = e.liveConsumerIndexOfThis[d], e.liveConsumerNode.length--, e.liveConsumerIndexOfThis.length--, o < e.liveConsumerNode.length) {
let c = e.liveConsumerIndexOfThis[o], m = e.liveConsumerNode[o];
C(m), m.producerIndexOfThis[c] = o;
}
}
function b(e) {
var o;
return e.consumerIsAlwaysLive || (((o = e?.liveConsumerNode) == null ? void 0 : o.length) ?? 0) > 0;
}
function C(e) {
e.producerNode ?? (e.producerNode = []), e.producerIndexOfThis ?? (e.producerIndexOfThis = []), e.producerLastReadVersion ?? (e.producerLastReadVersion = []);
}
function D(e) {
e.liveConsumerNode ?? (e.liveConsumerNode = []), e.liveConsumerIndexOfThis ?? (e.liveConsumerIndexOfThis = []);
}
function H(e) {
if (z(e), W(e), e.value === O) throw e.error;
return e.value;
}
function ve(e) {
let o = Object.create(we);
o.computation = e;
let r = ()=>H(o);
return r[E] = o, r;
}
var A = Symbol("UNSET"), P = Symbol("COMPUTING"), O = Symbol("ERRORED"), we = {
...V,
value: A,
dirty: !0,
error: null,
equal: $,
producerMustRecompute (e) {
return e.value === A || e.value === P;
},
producerRecomputeValue (e) {
if (e.value === P) throw new Error("Detected cycle in computations.");
let o = e.value;
e.value = P;
let r = pe(e), d;
try {
d = e.computation.call(e.wrapper);
} catch (c) {
d = O, e.error = c;
} finally{
he(e, r);
}
if (o !== A && o !== O && d !== O && e.equal.call(e.wrapper, o, d)) {
e.value = o;
return;
}
e.value = d, e.version++;
}
};
function me() {
throw new Error;
}
var ge = me;
function ye() {
ge();
}
function Ne(e) {
let o = Object.create(xe);
o.value = e;
let r = ()=>(W(o), o.value);
return r[E] = o, r;
}
function Ce() {
return W(this), this.value;
}
function Te(e, o) {
le() || ye(), e.equal.call(e.wrapper, e.value, o) || (e.value = o, Se(e));
}
var xe = {
...V,
equal: $,
value: void 0
};
function Se(e) {
e.version++, de(), B(e);
}
var s = Symbol("node"), g, w, y, U;
((e)=>{
var o, r, c, m;
class K {
constructor(v, a = {}){
S(this, r), L(this, o);
let h = Ne(v)[E];
if (this[s] = h, h.wrapper = this, a) {
let f = a.equals;
f && (h.equal = f), h.watched = a[e.subtle.watched], h.unwatched = a[e.subtle.unwatched];
}
}
get() {
if (!g(this)) throw new TypeError("Wrong receiver type for Signal.State.prototype.get");
return Ce.call(this[s]);
}
set(v) {
if (!g(this)) throw new TypeError("Wrong receiver type for Signal.State.prototype.set");
if (se()) throw new Error("Writes to signals not permitted during Watcher callback");
let a = this[s];
Te(a, v);
}
}
o = s, r = new WeakSet, g = (l)=>M(r, l), e.State = K;
class Q {
constructor(v, a){
S(this, m), L(this, c);
let h = ve(v)[E];
if (h.consumerAllowSignalWrites = !0, this[s] = h, h.wrapper = this, a) {
let f = a.equals;
f && (h.equal = f), h.watched = a[e.subtle.watched], h.unwatched = a[e.subtle.unwatched];
}
}
get() {
if (!w(this)) throw new TypeError("Wrong receiver type for Signal.Computed.prototype.get");
return H(this[s]);
}
}
c = s, m = new WeakSet, w = (l)=>M(m, l), e.Computed = Q, ((l)=>{
var v, a, f, k;
function X(u) {
let n, t = null;
try {
t = N(null), n = u();
} finally{
N(t);
}
return n;
}
l.untrack = X;
function Y(u) {
var n;
if (!w(u) && !y(u)) throw new TypeError("Called introspectSources without a Computed or Watcher argument");
return ((n = u[s].producerNode) == null ? void 0 : n.map((t)=>t.wrapper)) ?? [];
}
l.introspectSources = Y;
function Z(u) {
var n;
if (!w(u) && !g(u)) throw new TypeError("Called introspectSinks without a Signal argument");
return ((n = u[s].liveConsumerNode) == null ? void 0 : n.map((t)=>t.wrapper)) ?? [];
}
l.introspectSinks = Z;
function _(u) {
if (!w(u) && !g(u)) throw new TypeError("Called hasSinks without a Signal argument");
let n = u[s].liveConsumerNode;
return n ? n.length > 0 : !1;
}
l.hasSinks = _;
function ee(u) {
if (!w(u) && !y(u)) throw new TypeError("Called hasSources without a Computed or Watcher argument");
let n = u[s].producerNode;
return n ? n.length > 0 : !1;
}
l.hasSources = ee;
class oe {
constructor(n){
S(this, a), S(this, f), L(this, v);
let t = Object.create(V);
t.wrapper = this, t.consumerMarkedDirty = n, t.consumerIsAlwaysLive = !0, t.consumerAllowSignalWrites = !1, t.producerNode = [], this[s] = t;
}
watch(...n) {
if (!y(this)) throw new TypeError("Called unwatch without Watcher receiver");
G(this, f, k).call(this, n);
let t = this[s];
t.dirty = !1;
let x = N(t);
for (let p of n)W(p[s]);
N(x);
}
unwatch(...n) {
if (!y(this)) throw new TypeError("Called unwatch without Watcher receiver");
G(this, f, k).call(this, n);
let t = this[s];
C(t);
let x = [];
for(let p = 0; p < t.producerNode.length; p++)n.includes(t.producerNode[p].wrapper) && (R(t.producerNode[p], t.producerIndexOfThis[p]), x.push(p));
for (let p of x){
let q = t.producerNode.length - 1;
if (t.producerNode[p] = t.producerNode[q], t.producerIndexOfThis[p] = t.producerIndexOfThis[q], t.producerNode.length--, t.producerIndexOfThis.length--, t.nextProducerIndex--, p < t.producerNode.length) {
let te = t.producerIndexOfThis[p], j = t.producerNode[p];
D(j), j.liveConsumerIndexOfThis[te] = p;
}
}
}
getPending() {
if (!y(this)) throw new TypeError("Called getPending without Watcher receiver");
return this[s].producerNode.filter((n)=>n.dirty).map((n)=>n.wrapper);
}
}
v = s, a = new WeakSet, f = new WeakSet, k = function(u) {
for (let n of u)if (!w(n) && !g(n)) throw new TypeError("Called watch/unwatch without a Computed or State argument");
}, y = (u)=>M(a, u), l.Watcher = oe;
function re() {
var u;
return (u = ce()) == null ? void 0 : u.wrapper;
}
l.currentComputed = re, l.watched = Symbol("watched"), l.unwatched = Symbol("unwatched");
})(e.subtle || (e.subtle = {}));
})(U || (U = {}));
export { U as Signal };
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