@angular/core
Version:
Angular - the core framework
32 lines • 5.62 kB
JavaScript
/**
* @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
*/
import { createSignal, SIGNAL, signalSetFn, signalUpdateFn } from '@angular/core/primitives/signals';
/**
* Create a `Signal` that can be set or updated directly.
*/
export function signal(initialValue, options) {
const signalFn = createSignal(initialValue);
const node = signalFn[SIGNAL];
if (options?.equal) {
node.equal = options.equal;
}
signalFn.set = (newValue) => signalSetFn(node, newValue);
signalFn.update = (updateFn) => signalUpdateFn(node, updateFn);
signalFn.asReadonly = signalAsReadonlyFn.bind(signalFn);
return signalFn;
}
function signalAsReadonlyFn() {
const node = this[SIGNAL];
if (node.readonlyFn === undefined) {
const readonlyFn = () => this();
readonlyFn[SIGNAL] = node;
node.readonlyFn = readonlyFn;
}
return node.readonlyFn;
}
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