Firstly, apologies if this thread comes across confused - because cjs -> esm really does have me confused. I'm trying to be a good citizen and move across, but it's painful. It's entirely possible i'm being an idiot. So let me explain with an example:
Take the kafkajs library as an example, it's a commonjs library with no named exports, when my app is commonjs, this code is fine:
import { ConfigResourceTypes } from 'kafkajs'
console.log(ConfigResourceTypes)
However if i change my app to esm,(type: module in package.json), then it fails:
❯ ./node_modules/.bin/tsx lib/index.ts
import { ConfigResourceTypes } from 'kafkajs'
^
SyntaxError: The requested module 'kafkajs' does not provide an export named 'ConfigResourceTypes'
at ModuleJob._instantiate (node:internal/modules/esm/module_job:171:21)
at async ModuleJob.run (node:internal/modules/esm/module_job:254:5)
at async onImport.tracePromise.__proto__ (node:internal/modules/esm/loader:485:26)
at async asyncRunEntryPointWithESMLoader (node:internal/modules/run_main:109:5)
Node.js v22.5.1
The error makes sense, but it's unclear to me why it's fine if my app is commonjs, but not if it's esm. It's like in one of those scenarios it handles the fact it's a cjs module and almost pollyfills the named exports, but in the other it doesn't.
On top of that, the IDE has no problems at all, so this catches people out at runtime, which sucks. I think that's because @types/kafkajs gives it the impression it does have named exports.
Is this a bug with ts-node/esm? Or am I doing something straight up wrong? I've tried various permutations of allowSyntheticDefaultImports, esModuleInterop etc to try and get my IDE to fail in the same way ts-node does when running in esm, but I can't.
Firstly, apologies if this thread comes across confused - because cjs -> esm really does have me confused. I'm trying to be a good citizen and move across, but it's painful. It's entirely possible i'm being an idiot. So let me explain with an example:
Take the
kafkajslibrary as an example, it's a commonjs library with no named exports, when my app is commonjs, this code is fine:However if i change my app to esm,(
type: modulein package.json), then it fails:The error makes sense, but it's unclear to me why it's fine if my app is commonjs, but not if it's esm. It's like in one of those scenarios it handles the fact it's a cjs module and almost pollyfills the named exports, but in the other it doesn't.
On top of that, the IDE has no problems at all, so this catches people out at runtime, which sucks. I think that's because
@types/kafkajsgives it the impression it does have named exports.Is this a bug with
ts-node/esm? Or am I doing something straight up wrong? I've tried various permutations ofallowSyntheticDefaultImports,esModuleInteropetc to try and get my IDE to fail in the same way ts-node does when running in esm, but I can't.