Function concatenate

test/fixtures/snapshot/typescript.js:966–972

(array1, array2)

    }
    ts.getRangesWhere = getRangesWhere;
    function concatenate(array1, array2) {
        if (!some(array2))
            return array1;
        if (!some(array1))
            return array2;
        return __spreadArray(__spreadArray([], array1, true), array2, true);
    }
    ts.concatenate = concatenate;
    function selectIndex(_, i) {
        return i;