Typescript: Resolve Package from different location than node_modules

Question

I am learning typescript and I would love to begin experimenting packages creation.

Here is my folder structure for the moment:

myProject/
├── node_modules/
├── src/
│   ├── app
│       ├── index.ts
│   ├── packages
│       ├── database
│           ├── index.ts
├── package.json
├── tsconfig.json

As you can see, my src folder is divided into app that will contain my application implementation and a package folder that is supposed to be more "abstract", in order to become one day a package eventually.

What I would like, would be to access to my packages modules writing the following in my app folder:

import Database from 'packages/database';

instead of

import Database from '../packages/database/index';

I looked around the paths configuration into the tsconfig.json file but I could not get it to work:

{
  "compilerOptions": {

    ...

    "baseUrl": ".",
    "paths": {
      "packages": ["src/packages"]
    }
  }
}

I would also like to keep access to the node_modules folder of course...

How could I achieve that?

Thank your for your replies

Sylvain Attoumani · Accepted Answer · 2017-09-20 08:42:04Z

I think that the best solution for you would be to divide your work into several packages:

For example, you would have a package-database package that would make all the database related work for you.

In order to do that, you need to modify your structure a little bit:

myProject/
├── node_modules/
├── src/
│   ├── app
│       ├── index.ts
│   ├── packages
│       ├── database
│           ├── SomeClass.ts
│           ├── index.ts
├── package.json
├── tsconfig.json

Then make all the exports in your database/index.ts file:

import SomeClass from './SomeClass'
import SomeOtherClass from './SomeOtherClass'

export {SomeClass, SomeOtherClass}

You would the be able to access it from your app folder typing:

import {SomeClass} from 'package-database';

Of course, you also need to modify your tsconfig.json, you were close to it:

{
    "compilerOptions": {

    ...

    "baseUrl": ".",
    "paths": {
        "package-database": ["src/packages/database"]
        }
    } 
}

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