What steps can be taken to ensure that typescript exports remain backward compatible with module.exports?

I initially defined a node.js module in the following way:

function sayHello(){
  // do something
}

module.exports = sayHello;

After transitioning to typescript, I created sayHello.ts like this:

function sayHello():void {
  // do something
}

export default sayHello;

This change allowed me to import from other .ts files using:

import sayHello from "./sayHello";

However, for legacy .js files, they now need to be updated with require('./sayHello.js').default when exporting.

Is there a way to combine ES6 imports and ES5 require functionality?

tsconfig.json
---
{
    "compilerOptions": {
        "target": "es5",
        "lib": [],
        "checkJs": false,
        "declaration": true,
        "declarationMap": true,
        "sourceMap": false,
        "outDir": ".",
        "rootDir": ".",
        "importHelpers": true,
        "strict": true,
        "moduleResolution": "node",
        "allowSyntheticDefaultImports": true,
        "esModuleInterop": true
    }
}

Answer №1

Here's the solution that worked for me:

function greet(){...}

module.exports = greet

This method successfully functioned with both import greet from "./greet" and const greet = require("./greet")

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