this gist will provide standalone funtion `semverCompare` and accompanying test

semverCompare.js

/*jslint devel*/
function semverCompare(aa, bb) {
/*
 * this function will compare semver versions aa ? bb and return
 * -1 if aa < bb
 *  0 if aa = bb
 *  1 if aa > bb
 * https://semver.org/#spec-item-11
 * example usage:
    semverCompare("2.2.2", "10.2.2"); // -1
    semverCompare("1.2.3", "1.2.3");  //  0
    semverCompare("10.2.2", "2.2.2"); //  1
 */
    var ii;
    var len;
    [
        aa, bb
    ] = [
        aa, bb
    ].map(function (val) {
        val = (
            /^(0|[1-9]\d*)\.(0|[1-9]\d*)\.(0|[1-9]\d*)(?:-((?:0|[1-9]\d*|\d*[a-zA-Z\-][0-9a-zA-Z\-]*)(?:\.(?:0|[1-9]\d*|\d*[a-zA-Z\-][0-9a-zA-Z\-]*))*))?(?:\+([0-9a-zA-Z\-]+(?:\.[0-9a-zA-Z\-]+)*))?$/
        ).exec(val) || [
            "", "", "", ""
        ];
        val[4] = val[4] || "";
        return val.slice(1, 4).concat(val[4].split("."));
    });
    ii = -1;
    len = Math.max(aa.length, bb.length);
    while (true) {
        ii += 1;
        if (ii >= len) {
            return 0;
        }
        aa[ii] = aa[ii] || "";
        bb[ii] = bb[ii] || "";
        if (ii === 3 && aa[ii] !== bb[ii]) {
            // 1.2.3 > 1.2.3-alpha
            if (!aa[ii]) {
                return 1;
            }
            // 1.2.3-alpha < 1.2.3
            if (!bb[ii]) {
                return -1;
            }
        }
        if (aa[ii] !== bb[ii]) {
            aa = aa[ii];
            bb = bb[ii];
            return (
                Number(aa) < Number(bb)
                ? -1
                : Number(aa) > Number(bb)
                ? 1
                : aa < bb
                ? -1
                : 1
            );
        }
    }
}

function test() {
/*
 * this function will test semverCompare's default handling-behavior
 */
    var opt;
    // test aa = bb
    opt = [
        [
            "",
            "1",
            "1.2",
            null,
            undefined
        ],
        [
            "1.2.3",
            "1.2.3+aa"
        ],
        [
            "1.2.3-aa",
            "1.2.3-aa+bb"
        ]
    ];
    opt.forEach(function ([
        aa, bb
    ]) {
        console.assert(
            semverCompare(aa, bb) === 0,
            [
                aa, bb, semverCompare(aa, bb)
            ]
        );
    });
    // test aa < bb
    opt = [
        "syntax-err",
        "1.0.0-alpha",
        "1.0.0-alpha.1",
        "1.0.0-alpha.beta",
        "1.0.0-beta",
        "1.0.0-beta.2",
        "1.0.0-beta.11",
        "1.0.0-rc.1",
        "1.0.0",
        "2.2.2",
        "2.2.10",
        "2.10.2",
        "10.2.2"
    ];
    opt.reduce(function (aa, bb) {
        console.assert(
            semverCompare(aa, bb) === -1,
            [
                aa, bb, semverCompare(aa, bb)
            ]
        );
        return bb;
    });
    // test aa > bb
    opt.reverse().reduce(function (aa, bb) {
        console.assert(
            semverCompare(aa, bb) === 1,
            [
                aa, bb, semverCompare(aa, bb)
            ]
        );
        return bb;
    });
}

// run test
test();