fluidstate/extras/reactive-plugin-map.js

Library for fine-grained reactivity state management

"use strict";

Object.defineProperty(exports, "__esModule", {
  value: true
});
exports.getMapSetChanges = exports.getMapDeleteChanges = exports.getMapClearChanges = void 0;
var _reactivePlugin = require("./reactive-plugin");
/**
 * Generates a list of change descriptions for a map set operation.
 *
 * @param map The reactive map proxy.
 * @param key The key being set.
 * @param previousValue The previous value associated with the key.
 * @param nextValue The new value being set for the key.
 * @returns An array of ReactiveChange objects, or null if no reportable changes occurred (though for set, it always reports if called).
 */
const getMapSetChanges = (map, key, previousValue, nextValue) => {
  const mapChange = {
    type: _reactivePlugin.MapChangeType.SetValue,
    key,
    previousValue,
    nextValue
  };
  return [{
    type: _reactivePlugin.ReactiveChangeType.Map,
    map,
    mapChange
  }];
};

/**
 * Generates a list of change descriptions for a map delete operation.
 *
 * @param map The reactive map proxy.
 * @param key The key being deleted.
 * @param previousValue The value associated with the key before deletion.
 * @returns An array of ReactiveChange objects, or null if no reportable changes occurred.
 */
exports.getMapSetChanges = getMapSetChanges;
const getMapDeleteChanges = (map, key, previousValue) => {
  const mapChange = {
    type: _reactivePlugin.MapChangeType.DeleteValue,
    key,
    previousValue
  };
  return [{
    type: _reactivePlugin.ReactiveChangeType.Map,
    map,
    mapChange
  }];
};

/**
 * Generates a list of change descriptions for a map clear operation.
 *
 * @param map The reactive map proxy.
 * @param entries The array of [key, value] pairs representing the map's content before clearing.
 * @returns An array of ReactiveChange objects, or null if the map was already empty.
 */
exports.getMapDeleteChanges = getMapDeleteChanges;
const getMapClearChanges = (map, entries) => {
  const changes = entries.map(([key, previousValue]) => {
    const mapChange = {
      type: _reactivePlugin.MapChangeType.DeleteValue,
      key,
      previousValue
    };
    return {
      type: _reactivePlugin.ReactiveChangeType.Map,
      map,
      mapChange
    };
  });
  return changes;
};
exports.getMapClearChanges = getMapClearChanges;
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