无法在index.js中导入Brandade类，请求技术指导

Hey there, let's break down why you're hitting this error and fix it step by step!

First, Let's Diagnose the Root Causes #

Your ERR_MODULE_NOT_FOUND error comes from a few overlapping issues with file naming, TypeScript compilation rules, and ESM import behavior—plus a subtle bug in your class definition:

• You’re using TypeScript syntax in a .js file (Node can’t execute TypeScript directly)
• Node.js ESM requires explicit file extensions for imports
• Your class has a getter/setter naming conflict that would cause an infinite recursion loop once the import works

Step-by-Step Fixes #

1. Correct File Extensions & Add TypeScript Config #

First, rename your TypeScript files to use the .ts extension:

• Rename Brandade.js → Brandade.ts
• Optionally rename index.js → index.ts (to keep your codebase consistent)

Then create a tsconfig.json file in your project root to configure TypeScript compilation:

{
  "compilerOptions": {
    "target": "ES6",
    "module": "ESNext",
    "outDir": "./dist",
    "strict": true,
    "moduleResolution": "node"
  },
  "include": ["**/*.ts"],
  "exclude": ["node_modules"]
}

2. Fix the Brandade Class (Resolve Recursion Bug) #

Your class uses the same name nom for both the property and its getter/setter, which will trigger an infinite loop. Update it to use a private backing property:

export class Brandade{
  private _nom: string;
  prix: number;

  constructor(nom: string, prix: number) {
    this._nom = nom;
    this.prix = prix;
  }

  get nom(){
    return this._nom;
  }

  set nom(nom: string){
    this._nom = nom;
  }

  afficher_nom(){
    console.log(this._nom);
  }
}

3. Fix the Import Path (ESM Requires Explicit Extensions) #

Node.js ESM won’t auto-resolve file extensions, so you need to include the full extension in your import:

Option A: Compile to JavaScript first

1. Run tsc to compile your TypeScript files into the dist folder
2. Update your compiled index.js (in dist) to import the compiled class:

import {Brandade} from "./modules/Brandade.js";

3. Update your package.json scripts to build and run the compiled code:

"scripts": {
  "build": "tsc",
  "start": "node dist/index.js"
}

Option B: Run TypeScript directly with ts-node

1. Install dev dependencies:

npm install -D ts-node typescript

2. Update your index.ts import to use the .ts extension:

import {Brandade} from "./modules/Brandade.ts";

3. Update your package.json start script:

"scripts": {
  "start": "ts-node index.ts"
}

4. Keep ESM Configuration Enabled #

Leave "type": "module" in your package.json—this tells Node.js to treat files as ESM modules, which aligns with your import syntax.

Test Your Fix #

Run npm start after making these changes. Your class should import successfully, and calling brandade.afficher_nom() will log the correct value without errors.

内容的提问来源于stack exchange，提问作者Rudy