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To splice an element to the start of an array, you can use the splice() method with the following arguments:

array.splice(0, 0, element);

This will add the element to the start of the array, without removing any elements.

For example:

let array = [1, 2, 3];

array.splice(0, 0, 0);

console.log(array);  // [0, 1, 2, 3]

The first argument (0) is the index at which to start inserting the new element. The second argument (0) is the number of elements to remove, starting at the index specified in the first argument. The third argument (element) is the element to insert at the specified index.