如何将现有的打字稿命名空间类用作Node.js的外部模块

Question

The simple question here is how do I use namespaced typescript classes as external modules for use in node. The answer to that seems to be

It can't be done, don't try it, don't use namespaces

Well I am in the position that we have a large codebase that is all written in namespaces and we are now trying to use this code in node.js as well.

I am trying to figure out how to use our existing code.

I have got as far as compiling my namespaced code into a commonjs nodelibs folder that produces one js file and one d.ts for each ts file.

I have to add the following to each of my ts files that I want to be available to node:

namespace Organisation.Project.Entities{
    export class SomeThing{

    }
}

var module: {copy module definition from node.d.ts}

if(module)
{
    module.exports = Organisation.Project.Entities;
}

I can use this code in my node application:

var entities = require("../nodelibs/entities/entities");

var myThing = new entities.SomeClass();

despite there being both a entities.js and entities.d.ts at ../nodelibs/entities/entities there is no type info or compile time checking that SomeClass is a thing.

I can manually import the references file and manually type the instance of the class but in my case SomeClass is a class with a lot of statics on it so I can't fingure out how to type it properly...

var entities = require("../nodelibs/entities/entities");

var classRef = entities.SomeClass;

var myVar = classRef.staticProperty;

In this example I can't type classRef as SomeClass as it isn't an instance of SomeClass , it's the class constructor. How do I type classRef so that I can get access to the static properties on the class Some Class ?

Thanks

Answer 1

Write the code with ES6 modules

In the module, use the static ES6 module syntax :

// File entities.ts
export namespace Organisation.Project.Entities {
    export class SomeClass {
        public static abc = 'abc';
    }
}

Then, import your namespace:

// File main.ts
import {Organisation} from './entities';
type classRef = Organisation.Project.Entities.SomeClass;
var myVar = classRef.abc;

Compile for Node.js

Say the compiler to generate modules in the CommonJS format:

// File tsconfig.json
{
    "compilerOptions": {
        "module": "commonjs"
    },
    "exclude": [
        "node_modules"
    ]
}

Compile for the browser

In a browser, you can use a bundler or a loader. There is some configuration to do.

Bundlers:

• Webpack ( a tutorial here );
• Browserify .

Loaders:

• SystemJS ( a tutorial here );
• RequireJS .