I ran into an issue while creating and exporting a constant object that holds component versions of the ~1,500 icons in the Phorsphor icons library and I’ve created the simple reproduction below:

Description of issue

We have:

• A generate.mjs Node.js file, which, when run, generates a generated.mjs file:

  import fs from 'node:fs'
  
  let source = `// @ts-check
  export const obj = {`
  for (let i = 0; i < 107634; i++) {
    source += `\n  key${i}: function () { return '' },`
  }
  source += '\n}'
  
  fs.writeFileSync('./generated.mjs', source)

• A generated.mjs file that exports a constant object obj with N number of entries, each of which is a function that returns an empty string,

• A consume.mjs file that imports { obj } from generated.mjs and references key10000:

  // @ts-check
  import { obj } from './generated.mjs'
  
  obj.key10000

Screen recording

https://vimeo.com/1073284447?share=copy#t=0

What happens

When 107,634 entries are created, resulting in a file that’s 4,194,285 bytes, everything works as it should.

When 107,635 entries are created, resulting in a file that’s 4,194,325 bytes, the language server shows the following error in consume.mjs:

Module '"./generated.mjs"' has no exported member 'obj'.

Interestingly (not shown in screen recording), I open generated.mjs in the same workspace as consume.msj, the error goes away. If I close the file, the error returns. So it only seems to affect imported objects where the source file is not open in the same workspace/session.

While the video recording shows the behaviour in Helix Editor, I also tested it our in VSCode and the behaviour is exactly the same.

What should happen

Both cases should work, or, if this is a hard limit of some sort that I’m hitting, it should be documented somewhere. (It’s possible that is and I haven’t been able to find it. I have looked quite a bit.)

Versions

Running on latest macOS with TypeScript language server installed via brew for Helix Editor.

• tsc --version: Version 5.8.3
• VSCode version info:

Version: 1.99.0 (Universal)
Commit: 4437686ffebaf200fa4a6e6e67f735f3edf24ada
Date: 2025-04-02T21:35:19.530Z (4 days ago)
Electron: 34.3.2
ElectronBuildId: 11161073
Chromium: 132.0.6834.210
Node.js: 20.18.3
V8: 13.2.152.41-electron.0
OS: Darwin arm64 24.3.0