Global `beforeEach` in jasmine?

I'm using Jasmine to write tests.

I have several test files, each file has a beforeEach, but they are exactly the same.

How do I provide a global beforeEach for them?

x1a4's answer confused me. This may be more clear:

When you declare a beforeEach function outside all describe blocks, it will trigger before each test (so before each it). It does not matter if you declare the beforeEach before or after your describe blocks.

You can include this in any specfile included in your test run—including in a file all on its own, hence the concept of a spec helper file that might contain just your global beforeEach declaration.

It's not mentioned in the documentation.

// Example: 

beforeEach(function() {
    localStorage.clear();
});

describe('My tests', function() {
    describe('Test localstorage', function() {

        it('Adds an item to localStorage', function() {
            localStorage.setItem('foo', 'bar');
            expect(localStorage.getItem('foo')).toBe('bar');
        });

        it('Is now empty because our beforeEach cleared localStorage', function() {
            expect(localStorage.getItem('foo')).toBe(null);
        });

    });
});

You can put it in your spec_helper.js file and it should work fine.