The function jasmine.addMatchers is not defined and is throwing a TypeError

I am encountering an error in my Node application when using "jasmine":"^2.5.2". The error message states:

 TypeError: jasmine.addMatchers is not a function

This error occurs when running jasmine-node spec from the terminal, even with a simple example like the one below.

What might be causing this issue and how can it be resolved?


function helloWorld() {
  return "Hello world!";
}

describe('keyframes-tool', function () {
    it("says hello", function() {
        expect(helloWorld()).toEqual("Hello world!");
    });
}); 

Answer №1

This issue might arise due to a mismatch between the versions of the jasmine-promise-matchers library being used.

The process of including promise matchers varies depending on whether you are working with jasmine versions 1 or 2 (and an older version may not be compatible with jasmine 3).

To resolve this, make sure to update to a newer version that is compatible with the jasmine-core version in use (for instance, a minimum of 2.6.0 for version 3 onwards).

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