Question 310878 in Javascript Question posted in
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Javascript – ts-node cannot find dependent module

Assume to have simple typescript program having two files:

src/hello.js

export default function hello() {
  return 'Hello world'
}

src/say.js

import hello from './hello.js'
console.log(hello())

with the following tsconfig.json

{
  "compilerOptions": {
    "lib": ["es2023"],
    "module": "node16",
    "target": "es2022",

    "strict": true,
    "esModuleInterop": true,
    "skipLibCheck": true,
    "forceConsistentCasingInFileNames": true,
    "moduleResolution": "node16",

    "allowSyntheticDefaultImports": true,

    "outDir": "dist",
  },
  "include": ["src/**/*"]
}

and CommonJS type set in package.json

{
  "type": "commonjs"
}

The problem is with ts-node failing with the following error:

$ npx ts-node src/say.ts
Error: Cannot find module './hello.js'
Require stack:
- /Users/pawel/wrk/github/ts-sandbox/src/say.ts
    at Function.Module._resolveFilename (node:internal/modules/cjs/loader:1144:15)
    at Function.Module._resolveFilename.sharedData.moduleResolveFilenameHook.installedValue [as _resolveFilename] (/Users/pawel/wrk/github/ts-sandbox/node_modules/@cspotcode/source-map-support/source-map-support.js:811:30)
    at Function.Module._load (node:internal/modules/cjs/loader:985:27)
    at Module.require (node:internal/modules/cjs/loader:1235:19)
    at require (node:internal/modules/helpers:176:18)
    at Object.<anonymous> (/Users/pawel/wrk/github/ts-sandbox/src/say.ts:1:1)
    at Module._compile (node:internal/modules/cjs/loader:1376:14)
    at Module.m._compile (/Users/pawel/wrk/github/ts-sandbox/node_modules/ts-node/src/index.ts:1618:23)
    at Module._extensions..js (node:internal/modules/cjs/loader:1435:10)
    at Object.require.extensions.<computed> [as .ts] (/Users/pawel/wrk/github/ts-sandbox/node_modules/ts-node/src/index.ts:1621:12) {
  code: 'MODULE_NOT_FOUND',
  requireStack: [ '/Users/pawel/wrk/github/ts-sandbox/src/say.ts' ]
}

This project works well when transpiled with tsc and simply run node dist/say.js. Also ts-node alternatives (tsx src/say.ts, tsimp src/say.ts) work without issues.

Please find complete source code here.

What I’m missing with ts-node please?

Tags:

2

Answers


  1. 0

    Just try removing the .js extension from the import line:

    src/say.js

    import hello from './hello.js' <<< HERE
console.log(hello())
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  2. 0

    first thing you are using import and it’s an feature of ES6
    to use it in your project you have to set the type to "module"
    by default it is "commonJs"

    but if you are using typscript you have to remove "type" from your package.json
    and it is doesn’t matter after transpiling ts into js it should work

    also remove "module" from tsconfig.json
    also set "target" to "nodeNext"

    i hope that will works

    second thing if you want to use js inside ts files you have to set "allowJs" property in "compilerOptions" in tsconfig
    that’s in development phase

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