defining global jasmine matchers in protractor

example.conf.js

// --- from protractor conf.js
 
onPrepare: function() {
  beforeEach(function() {
    // things to do before every run
    
    this.addMatchers({
      customMatcher: function() {
        // custom matcher codez
      }   
    });
  });
   
  afterEach(function() {
    // things to do after every tun
  });

  // other prep work (publish globals, test output config, etc)
},