Search Terms
ESM
NODE_OPTIONS
TypeError [ERR_UNKNOWN_FILE_EXTENSION]: Unknown file extension ".ts"
Expected Behavior
I'm using ts-node as part of Serverless to read the serverless.ts configuration file in my project which is defined as ESM with "type": "module" in package.json and "esm": true in tsconfig.json.
Same behavior like NODE_OPTIONS="--loader ts-node/esm".
Actual Behavior
If I start the serverless CLI with NODE_OPTIONS="--loader ts-node/esm", it loads the serverless.ts without a problem. However, if I avoid the NODE_OPTIONS env, I get the following error:
TypeError [ERR_UNKNOWN_FILE_EXTENSION]: Unknown file extension ".ts"
ts-node is used programmatically and registered as require(tsNodePath).register(); and I can verify that the tsNodePath points to a locally installed package. Somehow, when it then comes to the following await import('serverless.ts') it crashes with this error.
Steps to reproduce the problem
Minimal reproduction
See repo: https://github.com/zirkelc/serverless-esm-test
Steps to reproduce:
- clone repo
- npm install
- npx sls package
throws error ERR_UNKNOWN_FILE_EXTENSION]
- NODE_OPTIONS="--loader ts-node/esm" npx sls package
no error
Specifications
ts-node v10.8.1
node v16.13.0
compiler v4.7.3
- tsconfig.json, if you're using one:
{
"extends": "@tsconfig/node16-strictest-esm/tsconfig.json",
"compilerOptions": {
"moduleResolution": "node",
"sourceMap": true,
"outDir": "dist",
},
"include": [
"src/**/*.ts",
"serverless.ts"
],
"exclude": [
"node_modules/**/*",
".serverless/**/*",
".webpack/**/*",
"_warmup/**/*",
".vscode/**/*"
],
"ts-node": {
"esm": true,
}
}
{
"name": "serverless-esm-test",
"version": "1.0.0",
"description": "Serverless aws-nodejs-typescript template",
"main": "serverless.ts",
"type": "module",
"scripts": {
"test": "echo \"Error: no test specified\" && exit 1",
"sls:package": "nodemon --ext ts --exec \"npx sls package\""
},
"engines": {
"node": ">=14.15.0"
},
"dependencies": {
"@middy/core": "^3.0.4",
"@middy/http-json-body-parser": "^3.0.4"
},
"devDependencies": {
"@serverless/typescript": "^3.18.0",
"@tsconfig/node16-strictest-esm": "^1.0.1",
"@types/aws-lambda": "^8.10.98",
"@types/node": "^17.0.40",
"esbuild": "^0.14.42",
"json-schema-to-ts": "^2.5.3",
"serverless": "github:zirkelc/serverless#add-esm-support-configuration",
"serverless-esbuild": "^1.30.0",
"ts-node": "^10.8.1",
"tsconfig-paths": "^4.0.0",
"typescript": "^4.7.3"
},
"author": "The serverless webpack authors (https://github.com/elastic-coders/serverless-webpack)",
"license": "MIT"
}
- Operating system and version:
- If Windows, are you using WSL or WSL2?:
macOS
Search Terms
ESM
NODE_OPTIONS
TypeError [ERR_UNKNOWN_FILE_EXTENSION]: Unknown file extension ".ts"
Expected Behavior
I'm using ts-node as part of Serverless to read the
serverless.tsconfiguration file in my project which is defined as ESM with"type": "module"in package.json and"esm": truein tsconfig.json.Same behavior like
NODE_OPTIONS="--loader ts-node/esm".Actual Behavior
If I start the serverless CLI with
NODE_OPTIONS="--loader ts-node/esm", it loads theserverless.tswithout a problem. However, if I avoid theNODE_OPTIONSenv, I get the following error:ts-node is used programmatically and registered as
require(tsNodePath).register();and I can verify that thetsNodePathpoints to a locally installed package. Somehow, when it then comes to the followingawait import('serverless.ts')it crashes with this error.Steps to reproduce the problem
Minimal reproduction
See repo: https://github.com/zirkelc/serverless-esm-test
Steps to reproduce:
throws error
ERR_UNKNOWN_FILE_EXTENSION]no error
Specifications
ts-node v10.8.1
node v16.13.0
compiler v4.7.3
macOS