I am using ts-node
but it is giving me this error:
$ ts-node index.ts
TypeError [ERR_UNKNOWN_FILE_EXTENSION]: Unknown file extension ".ts" for /home/projects/node-hddds8/index.ts
I tried to remove "type": "module"
from my package.json
but in that case I get a different error:
$ ts-node index.ts
(node:45) Warning: To load an ES module, set "type": "module" in the package.json or use the .mjs extension.
(Use `node --trace-warnings ...` to show where the warning was created)
/home/projects/node-hddds8/index.ts:1
import chalk from 'chalk';
^^^^^^
SyntaxError: Cannot use import statement outside a module
Here is a reproduction link on StackBlitz: https://stackblitz.com/edit/node-hddds8?file=index.ts
My package.json looks like this:
{
"name": "node-starter",
"version": "0.0.0",
"type": "module",
"dependencies": {
"chalk": "^5.0.1",
"ts-node": "^10.8.1",
"typescript": "^4.7.4"
}
}
And my tsconfig.json looks like this:
{
"compilerOptions": {
"target": "esnext",
"module": "esnext",
"moduleResolution": "Node",
}
}
And my index.ts looks like this:
import chalk from 'chalk';
console.log(chalk.blue('Hello world!'));
Since you have "type": "module"
in your package.json
you are using ESM modules, therefore you need to add this to your tsconfig.json
:
{
"compilerOptions": {
"module": "ESNext" // or ES2015, ES2020
},
"ts-node": {
// Tell ts-node CLI to install the --loader automatically
"esm": true
}
}
While the solutions with ts-node-esm
or adding esm: true
to the ts-node options in tsconfig works with "older" node versions, with node >= 20, this fails again with ERR_UNKNOWN_FILE_EXTENSION
.
A workaround is to use node --loader
as described in this issue:
node --no-warnings=ExperimentalWarning --loader ts-node/esm file.ts
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