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Why explicit extension

Explicit import extension seems the ONLY convenient way to write dual module in typescript, supported by tsc.

Expected Behavior

$ ts-node a.ts
42

Actual Behavior

$ ts-node a.ts
Error: Cannot find module './b.js'

Steps to reproduce the problem

Minimal reproduction

// a.ts
import b from './b.js'
console.log(b)

// b.ts
export default 42

Specifications

• ts-node version:
• node version:
• TypeScript version:
• tsconfig.json, if you're using one:

{}

• Operating system and version:
• If Windows, are you using WSL or WSL2?: