下面的解决方案也适用于TS 1.7.5。

// Constancts.ts    
export const kNotFoundInArray = -1;
export const AppConnectionError = new Error("The application was unable to connect!");
export const ReallySafeExtensions = ["exe", "virus", "1337h4x"];

使用方法:

// Main.ts    
import {ReallySafeExtensions, kNotFoundInArray} from "./Constants";

if (ReallySafeExtensions.indexOf("png") === kNotFoundInArray) {
    console.log("PNG's are really unsafe!!!");
}

只需要在你的类中使用export变量和import变量

export var GOOGLE_API_URL = 'https://www.googleapis.com/admin/directory/v1';

// default err string message
export var errStringMsg = 'Something went wrong';

现在用它，

import appConstants = require('../core/AppSettings');
console.log(appConstants.errStringMsg);
console.log(appConstants.GOOGLE_API_URL);

以下是这个TS片段编译成(通过TS游乐场):

define(["require", "exports"], function(require, exports) {
    var Library = (function () {
        function Library() {
        }
        Library.BOOK_SHELF_NONE = "None";
        Library.BOOK_SHELF_FULL = "Full";
        return Library;
    })();
    exports.Library = Library;
});

如您所见，定义为public static的两个属性都被简单地附加到导出函数(作为其属性);因此，只要正确地访问函数本身，就应该可以访问它们。

如果你确实想要在现代浏览器中表现得更像一个静态常量值(因为它不能被其他代码更改)，你可以向Library类添加一个get only访问器(这只适用于ES5+浏览器和NodeJS):

export class Library {
    public static get BOOK_SHELF_NONE():string { return "None"; }
    public static get BOOK_SHELF_FULL():string { return "Full"; }   
}

var x = Library.BOOK_SHELF_NONE;
console.log(x);
Library.BOOK_SHELF_NONE = "Not Full";
x = Library.BOOK_SHELF_NONE;
console.log(x);

如果运行它，您将看到试图将BOOK_SHELF_NONE属性设置为新值是如何失败的。

2.0

在TypeScript 2.0中，你可以使用readonly来实现非常相似的结果:

export class Library {
    public static readonly BOOK_SHELF_NONE = "None";
    public static readonly BOOK_SHELF_FULL = "Full";
}

语法更简单，也更明显。但是，编译器阻止的是更改，而不是运行时(与第一个示例不同，在第一个示例中，根本不允许更改，如所示)。

下面的解决方案也适用于TS 1.7.5。

// Constancts.ts    
export const kNotFoundInArray = -1;
export const AppConnectionError = new Error("The application was unable to connect!");
export const ReallySafeExtensions = ["exe", "virus", "1337h4x"];

使用方法:

// Main.ts    
import {ReallySafeExtensions, kNotFoundInArray} from "./Constants";

if (ReallySafeExtensions.indexOf("png") === kNotFoundInArray) {
    console.log("PNG's are really unsafe!!!");
}

谢谢WiredPrairie!

为了进一步扩展您的答案，这里有一个定义常量类的完整示例。

// CYConstants.ts

class CYConstants {
    public static get NOT_FOUND(): number    { return -1; }
    public static get EMPTY_STRING(): string { return ""; }
}

export = CYConstants;

使用

// main.ts

import CYConstants = require("./CYConstants");

console.log(CYConstants.NOT_FOUND);    // Prints -1
console.log(CYConstants.EMPTY_STRING); // Prints "" (Nothing!)