Error importing JSONParser

[tegefaulkes]

In our code base when we try to import JSONParser with import { JSONParser } from '@streamparser/json'; we get the following error TS2307: Cannot find module '@streamparser/json' or its corresponding type declarations..

Currently as a work around we are importing it with const jsonStreamParsers = require('@streamparser/json'); which works fine.

My question is, do you have any insights to why the usual import is failing? Or is this likely a problem with the configuration of our project in some way?

Thanks.

• Related Importing @streamparser/json results in error when using tsc or jest relying on tsc MatrixAI/Polykey#516

[juanjoDiaz]

Hi @tegefaulkes ,

Which version of @streamparser/json are you using?
Which bundler are you using (webpack, rollup, esbuild, ...)?

The types are embedded in the package: https://github.com/juanjoDiaz/streamparser-json/blob/main/packages/plainjs/package.json#L8-L15 so there shouldn't be any problem.

You can check in your node_modules folder that the package is installed and the types are where they should be.

You can see here that a bunch of people is using it without a problem.

[CMCDragonkai]

Our tsconfig specifies "module": "CommonJS".

If we use a simple script like this:

import { JSONParser } from '@streamparser/json';

async function main() {
  console.log(JSONParser);
}

main();

Then attempt to compile with tsc it gives us this:

[nix-shell:~/Projects/Polykey]$ tsc ./test.ts
test.ts:1:28 - error TS2307: Cannot find module '@streamparser/json' or its corresponding type declarations.

1 import { JSONParser } from '@streamparser/json';
                             ~~~~~~~~~~~~~~~~~~~~


Found 1 error in test.ts:1

Current version of @streamparser/json is 0.0.12.

The tsc is 4.9.3.

We use lots of other packages, this is the first we have encountered this problem. Is it because of different package configuration?

[CMCDragonkai]

We don't use any bundler. It's just tsc.

We're also using swc, but swc does not have the same problem.

[CMCDragonkai]

Full tsconfig.json is:

{
  "compilerOptions": {
    "outDir": "./dist",
    "tsBuildInfoFile": "./dist/tsbuildinfo",
    "incremental": true,
    "sourceMap": true,
    "declaration": true,
    "allowJs": true,
    "strictNullChecks": true,
    "noImplicitAny": false,
    "experimentalDecorators": true,
    "esModuleInterop": true,
    "allowSyntheticDefaultImports": true,
    "resolveJsonModule": true,
    "moduleResolution": "node",
    "module": "CommonJS",
    "target": "ES2022",
    "baseUrl": "./src",
    "paths": {
      "@": ["index"],
      "@/*": ["*"]
    },
    "noEmit": true
  },
  "include": [
    "./src/**/*",
    "./src/**/*.json",
    "./tests/**/*",
    "./scripts/**/*",
    "./benches/**/*"
  ],
  "ts-node": {
    "require": ["tsconfig-paths/register"],
    "transpileOnly": true,
    "swc": true
  }
}

[juanjoDiaz]

Hi guys,

Indeed there seems to be an issue in versions after 0.10.
I'll look into it asap.

[tk-o]

I have it fixed on my end.

As a hint, I went to the dist/package.json file and removed this part:

  "typesVersions": {
    "*": {
      "*": ["./src/*"]
    }
  },

The typings were immediately matched in my VS Code.

Not sure why the typesVersions prop is an issue, but apparently that's the case.

[CMCDragonkai]

Cool, are you going to release a new version with the fix?

[juanjoDiaz]

Thanks for the hint.

The issue seems caused by a bug in Typescript: microsoft/TypeScript#43133

I'll do a fix asap 🙂

[juanjoDiaz]

This is fixed as part of 0.0.13.

Thanks for your patience!

[CMCDragonkai]

Nice!