打字稿生成不起作用的javascript

时间:2012-11-02 21:54:44

标签: node.js typescript

Node对于TypeScript正在生成的Javascript中的某些内容并不满意,我无法弄清楚原因。这是代码

Person.ts:

export module Models {
    export class Person {
        id: number;
        firstName: string;
        lastName: string;

        constructor(f: string, l: string) {
            this.firstName = f;
            this.lastName = l;
        }

        public saySomething(): void {
            console.log("my name is %s %s", this.firstName, this.lastName);
        }
    }
}

Database.ts:

import P = module("Person");

export module Database {
    export class DB {
        public findPerson(id: number): P.Models.Person {
            return new P.Models.Person("a", "b");
        }
    }
}

Test.ts:

var D = require("./DB");
var db = new D.Database.DB();
var p = db.findPerson(123);
p.saySomething();

它在Javascript中编译精细,但是正在创建的DB.js文件似乎有问题。当我尝试在节点中运行Test.js时得到:

$node Test.js
DB.js:2
(function (Database) {
^
TypeError: object is not a function
    at Object.<anonymous> (DB.js:2:1)
    at Module._compile (module.js:449:26)
    at Object.Module._extensions..js (module.js:467:10)
    at Module.load (module.js:356:32)
    at Function.Module._load (module.js:312:12)
    at Module.require (module.js:362:17)
    at require (module.js:378:17)
    at Object.<anonymous> (Test.js:1:73)
    at Module._compile (module.js:449:26)
    at Object.Module._extensions..js (module.js:467:10)

在导入DB.js期间发生了这种情况。奇怪的是,如果我改变findPerson()方法返回一个字符串而不是一个Person它可以正常工作。它与创建Person对象有关。

这是Javascript:

(function (Models) {
    var Person = (function () {
        function Person(f, l) {
            this.firstName = f;
            this.lastName = l;
        }
        Person.prototype.saySomething = function () {
            console.log("my name is %s %s", this.firstName, this.lastName);
        };
        return Person;
    })();
    Models.Person = Person;    
})(exports.Models || (exports.Models = {}));


var P = require("./Person")
(function (Database) {
    var DB = (function () {
        function DB() { }
        DB.prototype.findPerson = function (id) {
            return new P.Models.Person("a", "b");
        };
        return DB;
    })();
    Database.DB = DB;    
})(exports.Database || (exports.Database = {}));


var dbx = require("./DB")
var db1 = new dbx.Database.DB();
var p = db1.findPerson(123);
p.saySomething();

2 个答案:

答案 0 :(得分:5)

在var P = require(“./ Person”)之后没有分号javascript认为比下一个(...)是函数的调用。但是你似乎在Database.ts中有它,所以Typescript可能会在编译中丢失一些分号。

答案 1 :(得分:0)

主要问题是您要导入名为Person的模块,我认为您要导入包含名为Models的类的Person模块。

当您定位nodejs或其他CommonJS平台时,省略模块声明。

您还可以利用构造函数中的自动属性。

所以你会Models.ts

export class Person {
    id: number;

    constructor (public firstName: string, public lastName: string) {

    }

    public saySomething(): void {
        console.log("my name is %s %s", this.firstName, this.lastName);
    }
}

Database.ts

import models = module("Models");

export class DB {
    public findPerson(id: number): models.Person {
        return new models.Person("a", "b");
    }
}