dreamstate/esm/development/core/storing/ComputedValue.js

Store management library based on react context and observers

/**
 * A utility class for managing nested computed values.
 *
 * This class is used by the `ContextManager` to track and compare computed values during context updates.
 * It helps optimize state management by recalculating values only when dependencies change.
 */
var ComputedValue = /** @class */function () {
  function ComputedValue(selector, memo) {
    this.__selector__ = selector;
    this.__memo__ = memo;
  }
  ComputedValue.prototype.process = function (context) {
    // Process memoized computed in a special way, updated default computed every time.
    if (this.__memo__) {
      var diff_1 = this.__memo__(context);
      // Warn if someone provided wrong selector.
      {
        if (!Array.isArray(diff_1)) {
          console.warn("Expecting diff function from createComputed to return diff-array of dependencies.");
        }
      }
      // If diff initialized and we can check memo values.
      if (!this.__diff__ || this.__diff__.some(function (it, idx) {
        return it !== diff_1[idx];
      })) {
        this.__diff__ = diff_1;
        Object.assign(this, this.__selector__(context));
      }
    } else {
      Object.assign(this, this.__selector__(context));
    }
  };
  return ComputedValue;
}();

export { ComputedValue };