如何修复“@types/node/index.d.ts 不是模块”？

Question

I have installed node type definitions using the following command

npm install --save-dev @types/node

After that, when I try to import the node type definitions using the following statement

import { Process } from '@types/node';

or

import { Process } from 'node';

I get the following error

[ts] File '<root_path>/node_modules/@types/node/index.d.ts' is not a module.

I am sure there is something very basic that I am missing here but I cannot figure out.

Few more things

1. I am using Windows 8
2. I am using Visual Studio Code

Here is how my tsconfig.json looks

{
  "compilerOptions": {
    "target": "es2015",
    "module": "commonjs",
    "outDir": "lib",
    "typeRoots": [
        "node_modules/@typings"
    ]
  },
  "exclude": [
    "node_modules"
  ]
}

And here is how my webpackconfig.js looks

var path = require('path');

module.exports = {  
  entry: './ts/handler.ts',
  target: 'node',
  module: {
    loaders: [
      { test: /\.ts(x?)$/, loader: 'ts-loader' },      
      { test: /\.json$/, loader: 'json-loader' }
    ]
  },
  resolve: {
    extensions: ['.ts', '.js', '.tsx', '.jsx']
  },
  output: {
    libraryTarget: 'commonjs',
    path: path.join(__dirname, '.webpack'),
    filename: 'handler.js'
  },
};

Answer 1

Instead of using:

import { Process } from '@types/node';

You need to change your tsconfig.json :

{
  "compilerOptions": {
    ...
    "typeRoots": ["node_modules/@types"]
  }
}

After doing that the process variable becomes available as a global.

Sometimes you will need to import from a Node.js module like for example the fs module. You can do:

import * as fs from "fs";

You don't need to import fs from "node" or from "@types/node".

You can learn more here .

Answer 2

It's because inside the node typing file any module has declared with name node .

If you use

import { Process } from 'node';

TypeScript will try too find a node module or node namespace

Here you can load the complete file using

import 'node';

In your case you want to get only Process from NodeJS namespace :

import 'NodeJS';

Aftert that you just need to call it like this :

class toto implements NodeJS.Process{

}

EDIT :

If you use TypeScript >= 2.0 you should not need to add import in your file, only if you want to "optimize import"

Answer 3

I just changed in tsconfig file from

"typeRoots": ["./src/interfaces/index.d.ts"] 

this to

"typeRoots": ["node_modules/@types"]

and its working.

After that I face issue with mongoose library.

Module 'mongoose' has no exported member 'QueryFindOneAndUpdateOptions'

Then I installed mongoose version library

npm install mongoose@5.8.1 

and it's working now.

Answer 4

In vscode

Ctrl + Shift + p > Developer: Reload Window.