deps/v8/tools/profviz/composer.js
function assert(something, message) {
    if (!something) {
      var error = new Error(message);
      error_output(error.stack);
    }
  }
function assert(something, message) {
    if (!something) {
      var error = new Error(message);
      error_output(error.stack);
    }
  }
Utility functions.