// model_1.ts file
export  class Model_1{

  foo(): number {}
}

// model.ts file
declare function require(moduleName:string):any;
import {Model_1 as zip }  from './model_1';

if (true){
   let IntModel: typeof zip = require('./model_1')
   let modelInstance = new IntModel();
   const output = modelInstance.foo()
}

//Dynamic Module Loading in Node.js
declare function require(moduleName: string): any;

import { ZipCodeValidator as Zip } from "./ZipCodeValidator";

if (needZipValidation) {
   let ZipCodeValidator: typeof Zip = require("./ZipCodeValidator");
   let validator = new ZipCodeValidator();
   if (validator.isAcceptable("...")) { /* ... */ }
}

{
"compilerOptions": {
    "module": "commonjs",
    "noImplicitAny": true,
    "sourceMap": true,
    "removeComments": true,
    "preserveConstEnums": true,
    "declaration": true,
    "target": "es5",
    "lib": ["es2015", "dom"],
    "outDir": "./dist",
    "noUnusedLocals": true,
    "noImplicitReturns": true,
    "noImplicitThis": true,
    "noUnusedParameters": false,
    "pretty": true,
    "noFallthroughCasesInSwitch": true,
    "allowUnreachableCode": false
}