.ts.d typo?

[acopalipsis]

In native js has a type symbol. But You have to .ts.d specified the type Symbol? It's a typo?

[remojansen]

The native Symbol should start with uppercase. The type definitions use uppercase as well. Can you share more details about the error please?

[acopalipsis]

let id: symbol = Symbol.for('some-id'); // Symbol is constructor which retutn type symbol
typeof id === "symbol"; // true

String === string, Number === number, Symbol === symbol

[remojansen]

Symbol can be used to declare global and local symbols:

Symbol.for("foo"); // create a new global symbol
Symbol.for("foo"); // retrieve the already created symbol

// Same global symbol, but not locally
Symbol.for("bar") === Symbol.for("bar"); // true
Symbol("bar") === Symbol("bar"); // false

// The key is also used as the description
var sym = Symbol.for("mario");
sym.toString(); // "Symbol(mario)"

More info here.

InversifyJS is designed to use local symbols:

let TYPES = {
    Katana: Symbol("IKatana"),
    Ninja: Symbol("INinja"),
    Shuriken: Symbol("IShuriken")
};

@injectable()
class Ninja implements INinja {

    private _katana: Katana;
    private _shuriken: Shuriken;

    public constructor(
        @inject(TYPES.Katana) katana: Katana,
        @inject(TYPES.Shuriken) shuriken: Shuriken
    ) {
        this._katana = katana;
        this._shuriken = shuriken;
    }

    public fight() { return this._katana.hit(); };
    public sneak() { return this._shuriken.throw(); };

}

A full example is available here.

[acopalipsis]

https://www.typescriptlang.org/play/#src=let%20a%3A%20Symbol%3B%0Alet%20b%3A%20symbol%3B see that red Symbol? in .ts.d validation of the type Symbol.. but the compiler is yelling that this is a mistake, because there is no type Symbol is symbol.

[remojansen]

When you select a compilation target, TypeScript imports a file named lib.d.ts. This file delcares all the native JavaScript objects. The Symbol object is not recognized by typescript unless you target ES6. But if you add the InversifyJS type definitions:

/// <reference path="node_modules/inversify/type_definitions/inversify/inversify.d.ts" />

You will be able to target ES5 and the Symbol should be declared.

[acopalipsis]

You are right I compile es6. It was easier for me to .ts.d edit Symbol on the symbol.