Javascript 如何在Nodejs REPL中使用Typescript类？

我创建了一个

foo.ts

如下：

class Foo{
    public echo(){
    console.log("foo");
    }
}

var Foo = (function () {
    function Foo() {
    }
    Foo.prototype.echo = function () {
        console.log("foo");
    };
    return Foo;
})();

$ node
> require('./foo.js');
{}
> f = new Foo
ReferenceError: Foo is not defined
    at repl:1:10
    at REPLServer.self.eval (repl.js:110:21)
    at Interface.<anonymous> (repl.js:239:12)
    at Interface.EventEmitter.emit (events.js:95:17)
    at Interface._onLine (readline.js:202:10)
    at Interface._line (readline.js:531:8)
    at Interface._ttyWrite (readline.js:760:14)
    at ReadStream.onkeypress (readline.js:99:10)
    at ReadStream.EventEmitter.emit (events.js:98:17)
    at emitKey (readline.js:1095:12)

它输出如下javascript代码：

class Foo{
    public echo(){
    console.log("foo");
    }
}

var Foo = (function () {
    function Foo() {
    }
    Foo.prototype.echo = function () {
        console.log("foo");
    };
    return Foo;
})();

$ node
> require('./foo.js');
{}
> f = new Foo
ReferenceError: Foo is not defined
    at repl:1:10
    at REPLServer.self.eval (repl.js:110:21)
    at Interface.<anonymous> (repl.js:239:12)
    at Interface.EventEmitter.emit (events.js:95:17)
    at Interface._onLine (readline.js:202:10)
    at Interface._line (readline.js:531:8)
    at Interface._ttyWrite (readline.js:760:14)
    at ReadStream.onkeypress (readline.js:99:10)
    at ReadStream.EventEmitter.emit (events.js:98:17)
    at emitKey (readline.js:1095:12)

我想调用nodejs REPL中的

echo

函数，但它会导致如下错误：

class Foo{
    public echo(){
    console.log("foo");
    }
}

var Foo = (function () {
    function Foo() {
    }
    Foo.prototype.echo = function () {
        console.log("foo");
    };
    return Foo;
})();

$ node
> require('./foo.js');
{}
> f = new Foo
ReferenceError: Foo is not defined
    at repl:1:10
    at REPLServer.self.eval (repl.js:110:21)
    at Interface.<anonymous> (repl.js:239:12)
    at Interface.EventEmitter.emit (events.js:95:17)
    at Interface._onLine (readline.js:202:10)
    at Interface._line (readline.js:531:8)
    at Interface._ttyWrite (readline.js:760:14)
    at ReadStream.onkeypress (readline.js:99:10)
    at ReadStream.EventEmitter.emit (events.js:98:17)
    at emitKey (readline.js:1095:12)

$node
>要求（'./foo.js'）；
{}
>f=新Foo
ReferenceError:未定义Foo
回复：1:10
在REPLServer.self.eval（repl.js:110:21）
在接口处。（回复js:239:12）
位于Interface.EventEmitter.emit（events.js:95:17）
在接口处在线（readline.js:202:10）
在接口处。\u行（readline.js:531:8）
在接口处写入（readline.js:760:14）
在ReadStream.onkeypress（readline.js:99:10）
在ReadStream.EventEmitter.emit（events.js:98:17）
在emitKey（readline.js:1095:12）

---

如何实例化类并调用函数

echo

？

Node.js没有像browser

window

对象那样的泄漏全局变量

要在node.js中使用TypeScript代码，需要使用commonjs并导出类，即

class Foo{
    public echo(){
    console.log("foo");
    }
}

export = Foo;

然后在REPL中：

$ node
> var Foo = require('./foo.js');
{}
> f = new Foo();

---

要了解更多有关AMD/CommonJS的信息，请执行以下操作：

现代更新：您可以轻松使用ES模块：

在答复中：

$ node -r esm
> import { Foo } from './foo.js';
{}
> f = new Foo();

---

我不确定typescript是如何工作的，但很明显，您没有从Foo.js导出任何内容（也没有将所需的模块分配给任何内容）。可能先让自己熟悉任一节点的模块系统。