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

Angular - the core framework

{"version":3,"file":"_linked_signal-chunk.mjs","sources":["../../../../../k8-fastbuild-ST-fdfa778d11ba/bin/packages/core/primitives/signals/src/linked_signal.ts"],"sourcesContent":["/**\n * @license\n * Copyright Google LLC All Rights Reserved.\n *\n * Use of this source code is governed by an MIT-style license that can be\n * found in the LICENSE file at https://angular.dev/license\n */\n\nimport {COMPUTING, ERRORED, UNSET} from './computed';\nimport {defaultEquals, ValueEqualityFn} from './equality';\nimport {\n  consumerAfterComputation,\n  consumerBeforeComputation,\n  producerAccessed,\n  producerMarkClean,\n  producerUpdateValueVersion,\n  REACTIVE_NODE,\n  ReactiveNode,\n  runPostProducerCreatedFn,\n  SIGNAL,\n} from './graph';\nimport {signalSetFn, signalUpdateFn} from './signal';\n\n// Required as the signals library is in a separate package, so we need to explicitly ensure the\n// global `ngDevMode` type is defined.\ndeclare const ngDevMode: boolean | undefined;\n\nexport type ComputationFn<S, D> = (source: S, previous?: PreviousValue<S, D>) => D;\nexport type PreviousValue<S, D> = {source: S; value: D};\n\nexport interface LinkedSignalNode<S, D> extends ReactiveNode {\n  /**\n   * Value of the source signal that was used to derive the computed value.\n   */\n  sourceValue: S;\n\n  /**\n   * Current state value, or one of the sentinel values (`UNSET`, `COMPUTING`,\n   * `ERROR`).\n   */\n  value: D;\n\n  /**\n   * If `value` is `ERRORED`, the error caught from the last computation attempt which will\n   * be re-thrown.\n   */\n  error: unknown;\n\n  /**\n   * The source function represents reactive dependency based on which the linked state is reset.\n   */\n  source: () => S;\n\n  /**\n   * The computation function which will produce a new value based on the source and, optionally - previous values.\n   */\n  computation: ComputationFn<S, D>;\n\n  equal: ValueEqualityFn<D>;\n}\n\nexport type LinkedSignalGetter<S, D> = (() => D) & {\n  [SIGNAL]: LinkedSignalNode<S, D>;\n};\n\nexport function createLinkedSignal<S, D>(\n  sourceFn: () => S,\n  computationFn: ComputationFn<S, D>,\n  equalityFn?: ValueEqualityFn<D>,\n): LinkedSignalGetter<S, D> {\n  const node: LinkedSignalNode<S, D> = Object.create(LINKED_SIGNAL_NODE);\n\n  node.source = sourceFn;\n  node.computation = computationFn;\n  if (equalityFn != undefined) {\n    node.equal = equalityFn;\n  }\n\n  const linkedSignalGetter = () => {\n    // Check if the value needs updating before returning it.\n    producerUpdateValueVersion(node);\n\n    // Record that someone looked at this signal.\n    producerAccessed(node);\n\n    if (node.value === ERRORED) {\n      throw node.error;\n    }\n\n    return node.value;\n  };\n\n  const getter = linkedSignalGetter as LinkedSignalGetter<S, D>;\n  getter[SIGNAL] = node;\n  if (typeof ngDevMode !== 'undefined' && ngDevMode) {\n    const debugName = node.debugName ? ' (' + node.debugName + ')' : '';\n    getter.toString = () => `[LinkedSignal${debugName}: ${String(node.value)}]`;\n  }\n\n  runPostProducerCreatedFn(node);\n\n  return getter;\n}\n\nexport function linkedSignalSetFn<S, D>(node: LinkedSignalNode<S, D>, newValue: D) {\n  producerUpdateValueVersion(node);\n  signalSetFn(node, newValue);\n  producerMarkClean(node);\n}\n\nexport function linkedSignalUpdateFn<S, D>(\n  node: LinkedSignalNode<S, D>,\n  updater: (value: D) => D,\n): void {\n  producerUpdateValueVersion(node);\n  signalUpdateFn(node, updater);\n  producerMarkClean(node);\n}\n\n// Note: Using an IIFE here to ensure that the spread assignment is not considered\n// a side-effect, ending up preserving `LINKED_SIGNAL_NODE` and `REACTIVE_NODE`.\n// TODO: remove when https://github.com/evanw/esbuild/issues/3392 is resolved.\nexport const LINKED_SIGNAL_NODE: object = /* @__PURE__ */ (() => {\n  return {\n    ...REACTIVE_NODE,\n    value: UNSET,\n    dirty: true,\n    error: null,\n    equal: defaultEquals,\n    kind: 'linkedSignal',\n\n    producerMustRecompute(node: LinkedSignalNode<unknown, unknown>): boolean {\n      // Force a recomputation if there's no current value, or if the current value is in the\n      // process of being calculated (which should throw an error).\n      return node.value === UNSET || node.value === COMPUTING;\n    },\n\n    producerRecomputeValue(node: LinkedSignalNode<unknown, unknown>): void {\n      if (node.value === COMPUTING) {\n        // Our computation somehow led to a cyclic read of itself.\n        throw new Error(\n          typeof ngDevMode !== 'undefined' && ngDevMode ? 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