[solve]Unable to import my own JavaScript library

[exqmjmz]

I want to import my custom JavaScript library.
But there was an error during the library import.
What should I do?

error msg:
Cannot set properties of undefined (setting 'ULID')

CODE:

/**
 * Constructs a ULID generator closure that emits universally unique,
 * monotonic values.
 *
 * let generator = ULID();
 * let ulid0 = generator();
 * let ulid1 = generator();
 * assert(ulid0 < ulid1);
 */
function ULID() {
    const BASE32 = [
        '0', '1', '2', '3', '4', '5', '6', '7',
        '8', '9', 'A', 'B', 'C', 'D', 'E', 'F',
        'G', 'H', 'J', 'K', 'M', 'N', 'P', 'Q',
        'R', 'S', 'T', 'V', 'W', 'X', 'Y', 'Z'
    ];
    let last = -1;
    /* Pre-allocate work buffers / views */
    let ulid = new Uint8Array(16);
    let time = new DataView(ulid.buffer, 0, 6);
    let rand = new Uint8Array(ulid.buffer, 6, 10);
    let dest = new Array(26);

    function encode(ulid) {
        dest[0] = BASE32[ ulid[0] >> 5];
        dest[1] = BASE32[(ulid[0] >> 0) & 0x1f];
        for (let i = 0; i < 3; i++) {
            dest[i*8+2] = BASE32[ ulid[i*5+1] >> 3];
            dest[i*8+3] = BASE32[(ulid[i*5+1] << 2 | ulid[i*5+2] >> 6) & 0x1f];
            dest[i*8+4] = BASE32[(ulid[i*5+2] >> 1) & 0x1f];
            dest[i*8+5] = BASE32[(ulid[i*5+2] << 4 | ulid[i*5+3] >> 4) & 0x1f];
            dest[i*8+6] = BASE32[(ulid[i*5+3] << 1 | ulid[i*5+4] >> 7) & 0x1f];
            dest[i*8+7] = BASE32[(ulid[i*5+4] >> 2) & 0x1f];
            dest[i*8+8] = BASE32[(ulid[i*5+4] << 3 | ulid[i*5+5] >> 5) & 0x1f];
            dest[i*8+9] = BASE32[(ulid[i*5+5] >> 0) & 0x1f];
        }
        return dest.join('');
    }

    return function() {
        let now = Date.now();
        if (now === last) {
            /* 80-bit overflow is so incredibly unlikely that it's not
             * considered as a possiblity here.
             */
            for (let i = 9; i >= 0; i--)
                if (rand[i]++ < 255)
                    break;
        } else {
            last = now;
            time.setUint16(0, (now / 4294967296.0) | 0);
            time.setUint32(2, now | 0);
            window.crypto.getRandomValues(rand);
        }
        return encode(ulid);
    };
}

exports.ULID = ULID

[exqmjmz]

problem solve.
The custom JavaScript library needs to be imported using the UMD approach.
library import success

Modified code:

// File log.js
(function (global, factory) {
    if (typeof define === "function" && define.amd) {
        define(["exports"], factory);
    } else if (typeof exports !== "undefined") {
        factory(exports);
    } else {
        var mod = {
            exports: {}
        };
        factory(mod.exports);
        global.ULID = mod.exports;
    }
})(this, function (exports) {
    "use strict";

    /**
     * Constructs a ULID generator closure that emits universally unique,
     * monotonic values.
     *
     * var generator = ULID();
     * var ulid0 = generator();
     * var ulid1 = generator();
     * assert(ulid0 < ulid1);
     */
    function ULID() {
        var BASE32 = [
            '0', '1', '2', '3', '4', '5', '6', '7',
            '8', '9', 'A', 'B', 'C', 'D', 'E', 'F',
            'G', 'H', 'J', 'K', 'M', 'N', 'P', 'Q',
            'R', 'S', 'T', 'V', 'W', 'X', 'Y', 'Z'
        ];
        var last = -1;
        /* Pre-allocate work buffers / views */
        var ulid = new Uint8Array(16);
        var time = new DataView(ulid.buffer, 0, 6);
        var rand = new Uint8Array(ulid.buffer, 6, 10);
        var dest = new Array(26);

        function encode(ulid) {
            dest[0] = BASE32[ulid[0] >> 5];
            dest[1] = BASE32[(ulid[0] >> 0) & 0x1f];
            for (var i = 0; i < 3; i++) {
                dest[i * 8 + 2] = BASE32[ulid[i * 5 + 1] >> 3];
                dest[i * 8 + 3] = BASE32[(ulid[i * 5 + 1] << 2 | ulid[i * 5 + 2] >> 6) & 0x1f];
                dest[i * 8 + 4] = BASE32[(ulid[i * 5 + 2] >> 1) & 0x1f];
                dest[i * 8 + 5] = BASE32[(ulid[i * 5 + 2] << 4 | ulid[i * 5 + 3] >> 4) & 0x1f];
                dest[i * 8 + 6] = BASE32[(ulid[i * 5 + 3] << 1 | ulid[i * 5 + 4] >> 7) & 0x1f];
                dest[i * 8 + 7] = BASE32[(ulid[i * 5 + 4] >> 2) & 0x1f];
                dest[i * 8 + 8] = BASE32[(ulid[i * 5 + 4] << 3 | ulid[i * 5 + 5] >> 5) & 0x1f];
                dest[i * 8 + 9] = BASE32[(ulid[i * 5 + 5] >> 0) & 0x1f];
            }
            return dest.join('');
        }

        return function () {
            var now = Date.now();
            if (now === last) {
                /* 80-bit overflow is so incredibly unlikely that it's not
                 * considered as a possiblity here.
                 */
                for (var i = 9; i >= 0; i--)
                    if (rand[i]++ < 255)
                        break;
            } else {
                last = now;
                time.setUint16(0, (now / 4294967296.0) | 0);
                time.setUint32(2, now | 0);
                window.crypto.getRandomValues(rand);
            }
            return encode(ulid);
        };
    }
    function generator(){
        var ulid = new ULID()
        return ulid()
    }
    // expose ulid to other modules
    exports.generator = generator;
});

UMD model example code
code source:https://gist.github.com/kamleshchandnani/07c63f3d728672d91f97b69bbf700eed

// File log.js
(function (global, factory) {
  if (typeof define === "function" && define.amd) {
    define(["exports"], factory);
  } else if (typeof exports !== "undefined") {
    factory(exports);
  } else {
    var mod = {
      exports: {}
    };
    factory(mod.exports);
    global.log = mod.exports;
  }
})(this, function (exports) {
  "use strict";

  function log() {
    console.log("Example of UMD module system");
  }
  // expose log to other modules
  exports.log = log;
});

[FalkWolsky]

This is truly valuable! Thank you very much!