Function toOffset

test/fixtures/snapshot/typescript.js:1192–1194

* Gets the actual offset into an array for a relative offset. Negative offsets indicate a * position offset from the end of the array.

(array, offset)

     * position offset from the end of the array.
     */
    function toOffset(array, offset) {
        return offset < 0 ? array.length + offset : offset;
    }
    function addRange(to, from, start, end) {
        if (from === undefined || from.length === 0)
            return to;