1. First, check if you have a tsconfig.json file. If not, create one with:

npx tsc --init

2. Make sure your tsconfig.json includes the right module configuration. You need either: For CommonJS modules:

{ "compilerOptions": { "module": "CommonJS", // other options... } }

Or for ES modules:

{ "compilerOptions": { "module": "ESNext", "moduleResolution": "node", // other options... } }

3. For ES modules projects, verify your package.json has "type": "module" added

4. Try running with the specific module flag

npx ts-node --esm src/index.ts

Or for CommonJS:

npx ts-node --commonjs src/index.ts

Another approach would be to use ts-node-esm explicitly:

npx ts-node-esm src/index.ts