TypeScript: Access "this" inside a method of an anonymous class

Question

In my code I'm creating a new anonymous class that is implementing an interface.

private service: CommandService;

this.command = new class implements Command {
  execute(id: string): Promise<Result> {
    const resultId: string = await this.service.getResultId();
    return await this.service.getResult(resultId);
  };
};

What would be the best way to access the service in this case? I'm thinking of either

• define const _this = this above the class.
• give the service to the execute function.

Is there a better way to achieve this?

Edit:

I know that there's a wonderful answer here already, however, it doesn't explain how to access this within an anonymous class.

Answer 1

You never want to assign this. to a variable, that kind of breaks the whole point of using classes. This should instead be 2 diffrent classes, and just pass the needed values into the "inner" class, like this

import { Command, CommandService, Result } from 'foo';

class MyCommand implements Command {
    constructor(private readonly service: CommandService) { }
    async execute(id: string): Promise<Result> {
        const resultId: string = await this.service.getResultId();
        return await this.service.getResult(resultId);
    };
};

class ParentClass {
    private readonly service: CommandService;
    private readonly command = new MyCommand(this.service); 
}