The requested module '../data/test_json_file.json' does not provide an export named 'default'

[wojtekmaj]

I tried replacing ts-node with tsimp in a Node.js server project.

Upon running node --import=tsimp/import src/index.js, I was met with the following error:

/server/src/index.js:2
import myJsonFile from '../data/test_json_file.json' assert { type: 'json' };
       ^

SyntaxError: The requested module '../data/test_json_file.json' does not provide an export named 'default'
    at ModuleJob._instantiate (node:internal/modules/esm/module_job:131:21)
    at async ModuleJob.run (node:internal/modules/esm/module_job:213:5)
    at async ModuleLoader.import (node:internal/modules/esm/loader:316:24)
    at async loadESM (node:internal/process/esm_loader:34:7)
    at async handleMainPromise (node:internal/modules/run_main:66:12)

Node.js v20.9.0

This obviously works when using ts-node.

I have also tried using new with instead of assert, but this didn't do the trick either.

tsconfig.json:

{
  "compilerOptions": {
    "allowJs": true,
    "checkJs": false,
    "esModuleInterop": true,
    "isolatedModules": true,
    "lib": ["es2023"],
    "module": "nodenext",
    "moduleResolution": "nodenext",
    "noEmit": true,
    "noUncheckedIndexedAccess": true,
    "resolveJsonModule": true,
    "skipLibCheck": true,
    "sourceMap": true,
    "strict": true,
    "target": "es2022",
    "verbatimModuleSyntax": true
  },
  "exclude": ["dist"]
}

[isaacs]

Thanks for the report!

Hm, I'm getting a somewhat different error, but yes, json seems like it doesn't work at the moment.

$ node ./dist/esm/bin.mjs x.ts
file:///Users/isaacs/dev/tapjs/tsimp/package.json:2
    "name": "tsimp",
          ^

SyntaxError: Unexpected token ':'

[wojtekmaj]

Do you have
"resolveJsonModule": true,
in your tsconfig? This might be the reason we're getting different errors.

[isaacs]

I did, but maybe it's "type": "module" in package.json, or different ts versions?

Whatever the case, it was easily fixed :)

[isaacs]

Oh! No, it's that your json happened to be valid JS, and mine failed to parse as JS.

So it's the same failure, just different data.