In reply to @keiichi:matrix.org
It's funny how no one seems to be using typescript https://www.reddit.com/r/Nix/comments/x7tdxd/building_typescript_node_apps_with_nix/ https://www.reddit.com/r/NixOS/comments/16xlbk2/looking_for_help_to_use_nixos_in_a_typescript/

think I kinda managed to package my typescript program with buildNpmPackage but on run I get

$ jkops --help
Error: Cannot find module '/nix/store/z4dmxdr8v12cy6fzk723f0p9gyr7rxi4-jkops-1.0.0/lib/node_modules/jkops/node_modules/@aws-sdk/util-utf8-browser/dist-cjs/index.js'. Please verify that the package.json has a valid "main" entry
   at tryPackage (node:internal/modules/cjs/loader:438:19)
   at Function.Module._findPath (node:internal/modules/cjs/loader:680:18)
   at Function.Module._resolveFilename (node:internal/modules/cjs/loader:1063:27)
   at Function.Module._load (node:internal/modules/cjs/loader:922:27)
   at Module.require (node:internal/modules/cjs/loader:1143:19)
   at require (node:internal/modules/cjs/helpers:119:18)
   at Object.<anonymous> (/nix/store/z4dmxdr8v12cy6fzk723f0p9gyr7rxi4-jkops-1.0.0/lib/node_modules/jkops/node_modules/@aws-crypto/util/src/convertToBuffer.ts:5:1)
   at Module._compile (node:internal/modules/cjs/loader:1256:14)
   at Object.Module._extensions..js (node:internal/modules/cjs/loader:1310:10)
   at Module.load (node:internal/modules/cjs/loader:1119:32)

usually I can manage this kind of issues with a bit of NODE_PATH shenaningan but the files dont seem to even exist in fd -uL dist-cjs/index.js /nix/store/z4dmxdr8v12cy6fzk723f0p9gyr7rxi4-jkops-1.0.0/. I can share the package{-lock}.json if it helps.

I had this idea today for a radically simple ingestion method for package-lock.json.
The idea is:

• Map over package-lock.json packages, invoke correct fetcher
• Update package.json & package-lock.lock to point to store paths
• npm install

I have a PoC here: https://github.com/adisbladis/fetch-package-lock/blob/master/flake.nix#L78-L82

I'm wondering if there is anything obvious I've missed? It seems to easy/simple.

In reply to @c0ba1t:matrix.org
Hmm, you'd need to alter the source, right? Or do you plan to replace the package lock with a linked version?

In reply to @whentze:matrix.org
adisbladis: we have a weird cursed JS codebase at work I could try this on

I converted github-copilot-cli in nixpkgs and here are the eval performance results:

• before.json

{
  "cpuTime": 0.7983409762382507,
  "envs": {
    "bytes": 16531624,
    "elements": 828921,
    "number": 618766
  },
  "gc": {
    "heapSize": 402915328,
    "totalBytes": 180765008
  },
  "list": {
    "bytes": 3000672,
    "concats": 21613,
    "elements": 375084
  },
  "nrAvoided": 864119,
  "nrFunctionCalls": 558479,
  "nrLookups": 201175,
  "nrOpUpdateValuesCopied": 4886502,
  "nrOpUpdates": 45948,
  "nrPrimOpCalls": 391174,
  "nrThunks": 1152515,
  "sets": {
    "bytes": 98766016,
    "elements": 5996044,
    "number": 176832
  },
  "sizes": {
    "Attr": 16,
    "Bindings": 16,
    "Env": 16,
    "Value": 24
  },
  "symbols": {
    "bytes": 386981,
    "number": 37425
  },
  "values": {
    "bytes": 36922296,
    "number": 1538429
  }
}

• after.json

{
  "cpuTime": 0.510466992855072,
  "envs": {
    "bytes": 9614136,
    "elements": 488211,
    "number": 356778
  },
  "gc": {
    "heapSize": 402915328,
    "totalBytes": 91434160
  },
  "list": {
    "bytes": 1416640,
    "concats": 14601,
    "elements": 177080
  },
  "nrAvoided": 511866,
  "nrFunctionCalls": 321155,
  "nrLookups": 126367,
  "nrOpUpdateValuesCopied": 2282699,
  "nrOpUpdates": 28766,
  "nrPrimOpCalls": 240324,
  "nrThunks": 639741,
  "sets": {
    "bytes": 45028896,
    "elements": 2733143,
    "number": 81163
  },
  "sizes": {
    "Attr": 16,
    "Bindings": 16,
    "Env": 16,
    "Value": 24
  },
  "symbols": {
    "bytes": 370066,
    "number": 34762
  },
  "values": {
    "bytes": 20532984,
    "number": 855541
  }
}