Tests for code that adds the stack property to an Error subclass

error-stack-test.js

/* See https://github.com/pegjs/pegjs/pull/342 */

function subclass(child, parent) {
  function ctor() { this.constructor = child; }
  ctor.prototype = parent.prototype;
  child.prototype = new ctor();
}

function StackError() {
  if (typeof Error.captureStackTrace !== "function") {
    err = new Error();
    if (typeof Object.defineProperty === "function") {
      Object.defineProperty(this, "stack", {
        get: function () {
          return err.stack;
        }
      });
    } else {
      this.stack = err.stack;
    }
  } else {
    Error.captureStackTrace(this, StackError);
  }
}

function NoStackError() {
}

subclass(StackError, Error);
subclass(NoStackError, Error);

// throw new Error();
// throw new NoStackError();
// throw new StackError();

// try { throw new Error() } catch (e) { console.log(e.stack); }
// try { throw new NoStackError() } catch (e) { console.log(e.stack); }
// try { throw new StackError() } catch (e) { console.log(e.stack); }