Importing Local TS Package

[caleb-at-pieces]

To start, I'm not sure if this is the place for this issue, I am open to recreating this issue in another repository if it's more applicable.

Description

I am trying to import a local package into my jupyterlab extension project such as:

in package.json

"dependencies": {
  "local_package": "path/to/local/package"
}

The local package that I am using is just a bunch of typescript, there is no built js file, not even a package.json. This works fine while using npm in other environments, however I begin to run into issues while using jlpm (which I'm pretty sure uses yarn under the hood?)

So I ended up simply creating a package.json in the package I am trying to install, with index.ts as the entry point, this is where I'm not sure what to do next.

The package imports correctly, but when I try to build the extension with jlpm run build it is saying that the modules are not found.

Command Line Output

ModuleNotFoundError: Module not found: Error: Can't resolve './runtime' in '/Users/calebanderson/Documents/plugin_jupyter/node_modules/connector_openapi'
    at /Users/calebanderson/Documents/plugin_jupyter/node_modules/webpack/lib/Compilation.js:2022:28
    at /Users/calebanderson/Documents/plugin_jupyter/node_modules/webpack/lib/NormalModuleFactory.js:817:13
    at eval (eval at create (/Users/calebanderson/Documents/plugin_jupyter/node_modules/tapable/lib/HookCodeFactory.js:33:10), :10:1)
    at /Users/calebanderson/Documents/plugin_jupyter/node_modules/webpack/lib/NormalModuleFactory.js:275:22
    at eval (eval at create (/Users/calebanderson/Documents/plugin_jupyter/node_modules/tapable/lib/HookCodeFactory.js:33:10), :9:1)
    at /Users/calebanderson/Documents/plugin_jupyter/node_modules/webpack/lib/NormalModuleFactory.js:448:22
    at /Users/calebanderson/Documents/plugin_jupyter/node_modules/webpack/lib/NormalModuleFactory.js:118:11
    at /Users/calebanderson/Documents/plugin_jupyter/node_modules/webpack/lib/NormalModuleFactory.js:689:25
    at /Users/calebanderson/Documents/plugin_jupyter/node_modules/webpack/lib/NormalModuleFactory.js:893:8
    at /Users/calebanderson/Documents/plugin_jupyter/node_modules/webpack/lib/NormalModuleFactory.js:1013:5
resolve './runtime' in '/Users/calebanderson/Documents/plugin_jupyter/node_modules/connector_openapi'
  using description file: /Users/calebanderson/Documents/plugin_jupyter/node_modules/connector_openapi/package.json (relative path: .)
    Field 'browser' doesn't contain a valid alias configuration
    using description file: /Users/calebanderson/Documents/plugin_jupyter/node_modules/connector_openapi/package.json (relative path: ./runtime)
      no extension
        Field 'browser' doesn't contain a valid alias configuration
        /Users/calebanderson/Documents/plugin_jupyter/node_modules/connector_openapi/runtime doesn't exist
      .js
        Field 'browser' doesn't contain a valid alias configuration
        /Users/calebanderson/Documents/plugin_jupyter/node_modules/connector_openapi/runtime.js doesn't exist
      .json
        Field 'browser' doesn't contain a valid alias configuration
        /Users/calebanderson/Documents/plugin_jupyter/node_modules/connector_openapi/runtime.json doesn't exist
      .wasm
        Field 'browser' doesn't contain a valid alias configuration
        /Users/calebanderson/Documents/plugin_jupyter/node_modules/connector_openapi/runtime.wasm doesn't exist
      as directory
        /Users/calebanderson/Documents/plugin_jupyter/node_modules/connector_openapi/runtime doesn't exist
/Users/calebanderson/Documents/plugin_jupyter/node_modules/@jupyterlab/builder/lib/build-labextension.js:104
            throw new Error(err.details);

I see that jupyter is trying to resolve the file with different extensions, however the file is a typescript file, not js, wasm, or any of the ones it is looking for. I am not really sure what to do to resolve this next, this kind of strategy has worked for me in other projects however it's clear that this is not compatible with the jupyter build process.

Any help or workarounds for this would be much appreciated, this is definitely a pretty big blocker for my next development sprint.

Reproduce

1. create a local npm project with an 'index.ts' entry point
2. create another file in the project called 'runtime.ts's
3. import a function from 'runtime.ts' into 'index.ts'
4. add this local npm project to your jupyterlab extension's dependencies in package.json
5. try to build the jupyterlab extension

Expected behavior

I would expect this to be able to be built fine, as it has worked for me in other environments such as creating a vscode extension.

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[caleb-at-pieces]

I figured out a fix for this utilizing tsconfig:

{
  "compilerOptions": {
    "paths": [
      "package_name": "path/to/package"
    ]
  },
  "include": ["project/src", "path/to/package"]
}

So basically typescript can handle all the packaging, although it would be nice to have this as a feature in the jupyterlab build process to make it more closely resemble default bundler behaviors exhibited by webpack and esbuild.