@angular/core/fesm2022/_linked_signal-chunk.mjs

Angular - the core framework

/**
 * @license Angular v21.0.5
 * (c) 2010-2025 Google LLC. https://angular.dev/
 * License: MIT
 */

import { SIGNAL, runPostProducerCreatedFn, producerUpdateValueVersion, signalSetFn, producerMarkClean, signalUpdateFn, REACTIVE_NODE, UNSET, defaultEquals, COMPUTING, consumerBeforeComputation, ERRORED, consumerAfterComputation, producerAccessed } from './_effect-chunk.mjs';

function createLinkedSignal(sourceFn, computationFn, equalityFn) {
  const node = Object.create(LINKED_SIGNAL_NODE);
  node.source = sourceFn;
  node.computation = computationFn;
  if (equalityFn != undefined) {
    node.equal = equalityFn;
  }
  const linkedSignalGetter = () => {
    producerUpdateValueVersion(node);
    producerAccessed(node);
    if (node.value === ERRORED) {
      throw node.error;
    }
    return node.value;
  };
  const getter = linkedSignalGetter;
  getter[SIGNAL] = node;
  if (typeof ngDevMode !== 'undefined' && ngDevMode) {
    const debugName = node.debugName ? ' (' + node.debugName + ')' : '';
    getter.toString = () => `[LinkedSignal${debugName}: ${node.value}]`;
  }
  runPostProducerCreatedFn(node);
  return getter;
}
function linkedSignalSetFn(node, newValue) {
  producerUpdateValueVersion(node);
  signalSetFn(node, newValue);
  producerMarkClean(node);
}
function linkedSignalUpdateFn(node, updater) {
  producerUpdateValueVersion(node);
  signalUpdateFn(node, updater);
  producerMarkClean(node);
}
const LINKED_SIGNAL_NODE = /* @__PURE__ */(() => {
  return {
    ...REACTIVE_NODE,
    value: UNSET,
    dirty: true,
    error: null,
    equal: defaultEquals,
    kind: 'linkedSignal',
    producerMustRecompute(node) {
      return node.value === UNSET || node.value === COMPUTING;
    },
    producerRecomputeValue(node) {
      if (node.value === COMPUTING) {
        throw new Error(typeof ngDevMode !== 'undefined' && ngDevMode ? 'Detected cycle in computations.' : '');
      }
      const oldValue = node.value;
      node.value = COMPUTING;
      const prevConsumer = consumerBeforeComputation(node);
      let newValue;
      try {
        const newSourceValue = node.source();
        const prev = oldValue === UNSET || oldValue === ERRORED ? undefined : {
          source: node.sourceValue,
          value: oldValue
        };
        newValue = node.computation(newSourceValue, prev);
        node.sourceValue = newSourceValue;
      } catch (err) {
        newValue = ERRORED;
        node.error = err;
      } finally {
        consumerAfterComputation(node, prevConsumer);
      }
      if (oldValue !== UNSET && newValue !== ERRORED && node.equal(oldValue, newValue)) {
        node.value = oldValue;
        return;
      }
      node.value = newValue;
      node.version++;
    }
  };
})();

export { createLinkedSignal, linkedSignalSetFn, linkedSignalUpdateFn };
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