message: Type context as object
diff: @@ -14,7 +14,7 @@ export default class QueryEvaluator {
  this.operators = operators;
  }
  - evaluate(expression: QueryExpression, context = {}): any {
  + evaluate(expression: QueryExpression, context: object = {}): any {
  if (isQueryExpression(expression)) {
  let operator = this.operators[expression.op];
  if (!operator) {
  