JS kernel imported/required variables disappearing (in container only?)

athewsey commented 3 years ago

Specifically on the jslab kernel (doesn't seem to affect tslab TypeScript kernel), I'm finding that imported/required libraries disappear from scope between cells.

On my current configuration, it seems like this happens for any locally installed library, straight away after the first cell. So for example:

// lodash is in the current folder's ./node_modules
const lodash = require("lodash");
lodash;
console.log("Imported");

[Out 1]: Imported

lodash;
console.log("Still here");

[Out 2]: 1:1 - Cannot find name 'lodash'.

I've also observed that:

Libraries installed further up the directory tree (I'm actually in a container, with some in filesystem root /node_modules) work fine & persist between cells
Likewise built-ins seem OK (like child_process)
In some previous tests, I saw cases where the second cell would be fine but then trying to reference the library in a third cell (e.g. with same contents as [2] above) would cause the issue - but currently not able to reproduce that.
The same issue applies for destructured imports e.g. const { _ } = require("lodash"); or import { _ } from "lodash";

Environment

My setup is actually a bit unusual, and I'm wondering if the different behaviour of local vs FS root dependencies suggests that's a contributing factor in this case.

I'm trying to run tslab 1.0.15 as a custom image (draft Dockerfile here) in Amazon SageMaker Studio, on AWS - which means in practice that:

JupyterLab runs somewhere else, and connects in to the tslab kernel on my custom container
My working folder on the container (/home/sagemaker-user) is mounted to some persistent filesystem somewhere, while the root libraries /node_modules) are the container's native filesystem.

...So I guess there's a chance some fs-events-like monitoring system could be behaving unexpectedly?

Maybe it's related, that I'm also seeing occasional errors like the below when running shell commands via child_process.execSync?

unexpected error: Error: Unexpected pending rebuildTimer
    at Object.sys.setTimeout (/usr/lib/node_modules/tslab/dist/converter.js:83:19)
    at scheduleProgramUpdate (/usr/lib/node_modules/tslab/node_modules/@tslab/typescript-for-tslab/lib/typescript.js:111417:41)
    at onSourceFileChange (/usr/lib/node_modules/tslab/node_modules/@tslab/typescript-for-tslab/lib/typescript.js:111491:13)
    at /usr/lib/node_modules/tslab/node_modules/@tslab/typescript-for-tslab/lib/typescript.js:104579:78
    at updateContent (/usr/lib/node_modules/tslab/dist/converter.js:568:9)
    at Object.convert (/usr/lib/node_modules/tslab/dist/converter.js:218:9)
    at Object.execute (/usr/lib/node_modules/tslab/dist/executor.js:140:38)
    at JupyterHandlerImpl.handleExecuteImpl (/usr/lib/node_modules/tslab/dist/jupyter.js:219:38)
    at /usr/lib/node_modules/tslab/dist/jupyter.js:177:57
    at async JupyterHandlerImpl.handleExecute (/usr/lib/node_modules/tslab/dist/jupyter.js:177:21)

Appreciate that if it is specific to my environment then it might be a bit niche... But would be really interested to know if others can reproduce similar on the jslab kernel in other environments!

CrtlAltElite commented 1 year ago

having similar issues on simple variables. They work jsut fine them suddenly on a cell it says it can not find the variable

davy39 commented 3 months ago

Same for me, especially with objects.

yunabe / tslab

JS kernel imported/required variables disappearing (in container only?) #53