Method route

src/core/core.defaults.js:130–157

* Routes the named defaults to fallback to another scope/name. * This routing is useful when those target values, like defaults.color, are changed runtime. * If the values would be copied, the runtime change would not take effect. By routing, the * fallback is evaluated at each access, so its

(scope, name, targetScope, targetName)

	 * @param {string} targetName The target name in the target scope the property should be routed to.
	 */
  route(scope, name, targetScope, targetName) {
    const scopeObject = getScope(this, scope);
    const targetScopeObject = getScope(this, targetScope);
    const privateName = '_' + name;

    Object.defineProperties(scopeObject, {
      // A private property is defined to hold the actual value, when this property is set in its scope (set in the setter)
      [privateName]: {
        value: scopeObject[name],
        writable: true
      },
      // The actual property is defined as getter/setter so we can do the routing when value is not locally set.
      [name]: {
        enumerable: true,
        get() {
          const local = this[privateName];
          const target = targetScopeObject[targetName];
          if (isObject(local)) {
            return Object.assign({}, target, local);
          }
          return valueOrDefault(local, target);
        },
        set(value) {
          this[privateName] = value;
        }
      }
    });
  }

  apply(appliers) {
    appliers.forEach((apply) => apply(this));