Error [ERR_PACKAGE_PATH_NOT_EXPORTED]: No "exports" main

Hello, im having an issue importing this module when running even the simplest example. After upgrading this package from 2.7.x to latest, I’m getting this error when attempting to import

Error [ERR_PACKAGE_PATH_NOT_EXPORTED]: No "exports" main defined in /Users/x/node_modules/fastify-openapi-glue/package.json
    at new NodeError (node:internal/errors:372:5)
    at throwExportsNotFound (node:internal/modules/esm/resolve:472:9)
    at packageExportsResolve (node:internal/modules/esm/resolve:693:7)
    at resolveExports (node:internal/modules/cjs/loader:482:36)
    at Function.Module._findPath (node:internal/modules/cjs/loader:522:31)
    at Function.Module._resolveFilename (node:internal/modules/cjs/loader:919:27)
    at Function.Module._load (node:internal/modules/cjs/loader:778:27)
    at Module.require (node:internal/modules/cjs/loader:1005:19)
    at require (node:internal/modules/cjs/helpers:102:18)
    at Object.<anonymous> (/Users/x/dist/index.js:18:43) {
  code: 'ERR_PACKAGE_PATH_NOT_EXPORTED'
}

Is it something with the new esm update? I’m using typescript 4.7.4 and im using node 16.

index.ts

import fastify from "fastify";
import cors from "@fastify/cors";
import fastifyOpenapiGlue from "fastify-openapi-glue";
// const fastifyOpenapiGlue = require("fastify-openapi-glue");

const app = fastify();

app.register(cors);

app.register(fastifyOpenapiGlue);

console.log("fastify", fastify);

tsconfig.json

{
  "compilerOptions": {
    "target": "ES2022" /* Set the JavaScript language version for emitted JavaScript and include compatible library declarations. */,
    "module": "CommonJS" /* Specify what module code is generated. */,
    "esModuleInterop": true /* Emit additional JavaScript to ease support for importing CommonJS modules. This enables 'allowSyntheticDefaultImports' for type compatibility. */,
    "forceConsistentCasingInFileNames": true /* Ensure that casing is correct in imports. */,
    "strict": true /* Enable all strict type-checking options. */,
    "skipLibCheck": true /* Skip type checking all .d.ts files. */
  }
}

start script:

tsc && node index.js

[seriousme]

Good to read you got a solution !

I presume more people will have issues with this subject as many packages are migrating to ESM. Lets hope the Typescript team documents this a little better 😉

Kind regards, Hans

[jonasgroendahl]

Thanks for investigating this, I really had many issues working with ESM when it comes to TypeScript

I think I got it working using in package.json:

  "type": "module"

tsconfig.json

{
"compilerOptions": {
  "target": "ES2022" /* Set the JavaScript language version for emitted JavaScript and include compatible library declarations. */,
  "module": "Es2020" /* Specify what module code is generated. */,
  "esModuleInterop": true /* Emit additional JavaScript to ease support for importing CommonJS modules. This enables 'allowSyntheticDefaultImports' for type compatibility. */,
  "forceConsistentCasingInFileNames": true /* Ensure that casing is correct in imports. */,
  "strict": true /* Enable all strict type-checking options. */,
  "skipLibCheck": true /* Skip type checking all .d.ts files. */,
  "moduleResolution": "Node",
  "outDir": "dist",
  "rootDir": "src"
}
}

.js file become this: 😃

import fastify from "fastify";
import cors from "@fastify/cors";
import { fastifyOpenapiGlue } from "fastify-openapi-glue";
// const fastifyOpenapiGlue = require("fastify-openapi-glue");
const app = fastify();
app.register(cors);
app.register(fastifyOpenapiGlue);
console.log("fastify", fastify);