Javascript 无法在google apps脚本表中使用类方法

我有两个用typescript输入的文件，然后用.gs为google应用程序脚本编译。我有一类带有方法的助手函数，当我调用这个方法时：flatte_u，我收到一个错误

TypeError: Cannot find function flatten_ in object function Utils() {...}.

我试过： 1.使展平成为一种静态方法 2.使变平\静态特性 3.将“展平”声明为公共函数 都在班里，没有决心

backend.ts

import { Utils } from './utils/_';

function onOpen() {
    const ui = SpreadsheetApp.getUi();
    ui.createMenu('Tracker')
    .addItem('JUMP To Record', 'Jump')
    .addToUi();
}

function Jump() {
    const ui = SpreadsheetApp.getUi();
    const prompt = ui.prompt('Submit A Tracker ID');

    /** Once the user clicks ok */
    if(prompt.getSelectedButton() == ui.Button.OK) {
        /** If the tracker id length is less than 1 */
        if(prompt.getResponseText().length < 1) {
            Browser.msgBox('Submit A Valid Tracker Id');
        } else {
            /** Begin timer and find the tracker id record */
            console.time('Jump To Tracker Id Execution');
            const spreadsheet = SpreadsheetApp.getActiveSpreadsheet().getSheetByName('Client'); 
            const trackerRange = spreadsheet.getRange('1:1').getValues();
            const trackerColumn = trackerRange[0].indexOf('Tracker ID') + 1;
            const trackerIds = Utils.flatten_(spreadsheet.getRange(1, trackerColumn, spreadsheet.getLastRow(), 1).getValues());
            const recordIndex = trackerIds.indexOf(prompt.getResponseText());
            console.timeEnd('Submit A Valid Tracker Id');
            /** End timer and check record results */
            if(recordIndex == -1) {
                Browser.msgBox('Record ['+ prompt.getResponseText() + '] Could Not Be Found')
            } else {
                spreadsheet.setActiveRange(spreadsheet.getRange(recordIndex + 1, trackerColumn));
            }
        }
    }  
}

汇编_

// Compiled using ts2gas 3.4.4 (TypeScript 3.5.3)
var exports = exports || {};
var module = module || { exports: exports };

var Utils = /** @class */ (function () {
    function Utils() {
    }
    Utils.prototype.flatten_ = function (_) {
        /** Combines array of arrays of objects into a singular array of objects */
        return [].concat.apply([], _);
    };
    Utils.prototype.guidlist_ = function (_) {
        var _this = this;
        var z_ = _.map(function () { return [_this.guidcreate_()]; });
        return z_;
    };
    Utils.prototype.guidcreate_ = function () {
        var _ = function () { return (((1 + Math.random()) * 0x10000) | 0).toString(16).substring(1); };
        return (_() + _() + "-" + _() + "-" + _() + "-" + _() + "-" + _() + _() + _());
    };
    return Utils;
}());
exports.Utils = Utils;

---

通过扩展我能够访问的类，我找到了答案

export class Utils {
    iArray: Array<any>
    constructor(_:Array<any>) {
        this.iArray = _;
    }
}

export class Flatten extends Utils {
    exe(): any {
        return [].concat.apply([], this.iArray);
    }
}

// Compiled using ts2gas 3.4.4 (TypeScript 3.5.3)
var exports = exports || {};
var module = module || { exports: exports };

var Utils = /** @class */ (function () {
    function Utils() {
    }
    Utils.prototype.flatten_ = function (_) {
        /** Combines array of arrays of objects into a singular array of objects */
        return [].concat.apply([], _);
    };
    Utils.prototype.guidlist_ = function (_) {
        var _this = this;
        var z_ = _.map(function () { return [_this.guidcreate_()]; });
        return z_;
    };
    Utils.prototype.guidcreate_ = function () {
        var _ = function () { return (((1 + Math.random()) * 0x10000) | 0).toString(16).substring(1); };
        return (_() + _() + "-" + _() + "-" + _() + "-" + _() + "-" + _() + _() + _());
    };
    return Utils;
}());
exports.Utils = Utils;

export class Utils {
    iArray: Array<any>
    constructor(_:Array<any>) {
        this.iArray = _;
    }
}

export class Flatten extends Utils {
    exe(): any {
        return [].concat.apply([], this.iArray);
    }
}

import { Flatten } from "./utils/_";

const trackerIds = new Flatten(spreadsheet.getRange(1, trackerColumn, spreadsheet.getLastRow(), 1).getValues()).exe();