当内部模块已声明导入时，导入“找不到模块" [英] Import 'cannot find module' when internal module has imports declared

问题描述

我有这个命名空间

namespace Validation {

    export function Func1() {
    // code
    }

    export function Func2() {
        // code
    }    
}

我可以导入我的app.ts:

import Validations = Validation;

但是当我想引用Validation名称空间中的某些模块

But when I want to reference some modules in my Validation namespace

import {Request, Response} from 'express';
var jwt    = require('jsonwebtoken');
var express = require('express');
import {Config} from './../config';

namespace Validation {

    export function Func1() {
    // code
    }

    export function Func2() {
        // code
    }    
}

然后在我的app.ts中的import Validations = Validation;给我一个错误cannot find namespace Validation.

So then import Validations = Validation; in my app.ts giving me an error cannot find namespace Validation.

为什么会这样?有什么想法要解决吗?

Why it is happened? Any thoughts how to fix?

更新1:如果我将导入放在命名空间之后，则会出现错误Import declaration in a namespace cannot import a module:

UPDATE 1 : In case if I put imports after namespace I am getting an error Import declaration in a namespace cannot import a module:

 namespace Validation {

import {Request, Response} from 'express'; //Error: Import declaration in a namespace cannot import a module
var jwt    = require('jsonwebtoken');
var express = require('express');
import {Config} from './../config'; //Error: Import declaration in a namespace cannot import a module

    export function Func1() {
    // code
    }

    export function Func2() {
        // code
    }    
}

我的config.ts只是一个简单的类:

my config.ts is just a simple class:

export class Config {
        public static get Secret():string { return 'stuff'; }
        public static get Database():string { return 'mongodb://127.0.0.1:27019/test'; }
    }

'express'这是一个 npm软件包

更新2 我想我只是通过将配置文件包装到名称空间中来修复该配置文件:

UPDATE 2 I think I just fixed config by wrapping it in to namespace:

namespace Common {
    export class Config { .. }
}

也将导入语句从此import {Config} from './config';更改为以下内容:import Config = Common.Config;，但尚未弄清楚如何解决'express'的问题

Also changed import statement from this import {Config} from './config'; to this: import Config = Common.Config; but haven't yet figure out how to fix 'express' thing

推荐答案

之所以发生这种情况，是因为从您将顶级import或export语句放入文件的那一刻起，该文件就被视为外部模块本身.如果您使用的是内部模块(命名空间)，建议您导入 inside 命名空间，这样就不会出现顶级的import或export语句.

This happens because from the moment you put a top-level import or export statement into a file, that file is treated as an external module itself. If you are using internal modules (namespaces), I suggest importing inside namespaces, so that there are no top-level import or export statements.

namespace Validation {
    import Request = ...;
    import Response = ...;

    export function Func1() {
    // code
    }

    export function Func2() {
        // code
    }    
}

另一种方法是改为使用外部模块，但这需要模块加载系统，在许多情况下可能是多余的.

The other approach would be to use external modules instead, but that requires a module loading system, which might be superfluous in many cases.

现在，您正在混合使用内部和外部模块，不建议这样做.对于像这样的复杂结构案例，Typescript还远远不是一种成熟的语言.

Right now, you are mixing internal and external modules, which is not recommended. Regarding complex structural cases like this, Typescript is still very far from being a mature language.

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