Is there a way to add a Jasmine matcher to the whole environment

Question

There are plenty of documents that show how to add a matcher to a Jasmine spec (here, for example).

Has anyone found a way to add matchers to the whole environment; I'm wanting to create a set of useful matchers to be called by any and all tests, without copypasta all over my specs.

Currently working to reverse engineer the source, but would prefer a tried and true method, if one exists.

Answer 1

Sure, you just call beforeEach() without any spec scoping at all, and add matchers there.

This would globally add a toBeOfType matcher.

beforeEach(function() {
  var matchers = {
    toBeOfType: function(typeString) {
      return typeof this.actual == typeString;
    }
  };

  this.addMatchers(matchers);
});

describe('Thing', function() {
  // matchers available here.
});

I've made a file named spec_helper.js full of things like custom matchers that I just need to load onto the page before I run the rest of the spec suite.