Method prop

src/shared/utils/ObjectParser.ts:169–195

(label: L, funcOrOptional?: ((prop: P[L]) => void) | boolean, optional?: boolean)

  }

  prop<L extends keyof P>(label: L, funcOrOptional?: ((prop: P[L]) => void) | boolean, optional?: boolean): IObjectParserProp<P[L]> {
    // Figure out which argument is used for what purpose
    let func: ((prop: P[L]) => void)|undefined; // ("func" from parameter)
    let isOptional: boolean; // ("optional" from parameter)
    if (typeof funcOrOptional === 'function') {
      func = funcOrOptional;
      isOptional = !!optional;
    } else { isOptional = !!funcOrOptional; }

    // Check if property exists
    if (this._property !== null &&
        this._property !== undefined &&
        Object.prototype.hasOwnProperty.call(this._property, label)) {
      // Property callback
      if (func) { func(this._property[label]); }
      // Create and return wrapper (around property)
      const prop = this._property && this._property[label];
      return new ObjectParserProp(prop, this._context, createStack(this._stack, label)) as any;
    } else {
      // Error callback
      if (!isOptional) {
        this._context.onError(new ObjectParserError(this._stack, `Property "${label as any}" was not found.`));
      }
      // Create and return wrapper (around nothing)
      return new ObjectParserPropNone();
    }
  }
}

/**