Enforces to not have Git merge conflict markers.
const foo = 'foo';
<<<<<<< HEAD
const bar = 'bar';
=======
const bar = 'ba';
>>>>>>> master
const foo = 'foo';
<<<<<<< HEAD
const bar = 'bar';
const foo = 'foo';
const bar = 'bar';
=======
const foo = 'foo';
const bar = 'bar';
>>>>>>> master
const foo = 'foo';
const bar = 'bar';