Exploring the Way Constructors are Utilized with Decorators in TypeScript

Encountering issues when attempting to utilize constructor spreads with decorators in TypeScript, here is the code snippet:

export function httpGet(path?: string, ...middlewares : Function[]) { };

Usage example:

class Controller {
  @httpGet('/:id')
  async get(ctx: Context) { .... }
}

Resulting in the following error:

Cannot invoke an expression whose type lacks a call signature.

30   @httpGet('/:id')
 ~~~~~~~~~~~~~~~~

src/api/Controller.ts(30,3): error TS1241: Unable to resolve signature
of method decorator when called as an expression.

Answer №1

In order for it to function properly, the method decorator must adhere to the following signature:

export function httpGet(path?: string, ...middlewares : Function[]) {
    return (target: Object, propertyKey: string, descriptor: TypedPropertyDescriptor<any>) => {
        // custom code implementation here
    };  
}

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