I have a problem with parametrs decorator

May 8, 2024

I want to use TSyringe to implement DI in my application. So, i use interfases, thats why i have to apply a parametrs decorator to link the interface and the class. But i have a problem "Decorators are not valid here.ts(1206)" and @injectable() for class is working without a problem.

public constructor(@inject("Controller") private _controller: Controller) { }

I used google and I tried find solution of my problem.
I changed "experimentalDecorators", "emitDecoratorMetadata" to true and "useDefineForClassFields": false, but it didn’t help me.

That is my tsconfig.json:

{ "compilerOptions": { "target": "ES2020", "useDefineForClassFields": false, } "experimentalDecorators": true, "emitDecoratorMetadata": true }

>Solution :

It looks like that you have a problem with tsconfig.json.
The experimentDecorators and emitDecoratorMetadata options should be within the compilerOptions. In order to be applied correctly.
Here is the updated tsconfig.json:

{
  "compilerOptions": {
    "target": "ES2020",
    "experimentalDecorators": true,
    "emitDecoratorMetadata": true,
    "useDefineForClassFields": false
  }
}

I will be happy when this answer solves your problem.