Source: assert.js

  1. "use strict";
  3. let loggingFunction = console.error.bind(console);
  5. /**
  6.  * If `truthy` is a truthy, returns that truthy without doing anything else. If it is
  7.  * a falsy, returns it and displays the assertion message.
  8.  *
  9.  * @function assert
  10.  *
  11.  * @param truthy  {Truthy|Falsy} The truthy to test.
  12.  * @param message {String}       The message to display with console.error() when `truthy` is a falsy.
  13.  *
  14.  * @return {Any} Returns truthy.
  15.  */
  16. module.exports = (truthy, message) => {
  17.     if (!truthy) {
  18.         loggingFunction(message);
  19.     }
  21.     return truthy;
  22. };
  24. module.exports.setErrorLoggingFunction = λ => {
  25.     loggingFunction = λ;
  26. };
  28. module.exports.getErrorLoggingFunction = () => {
  29.     return loggingFunction;
  30. };