Type error with string key using provide/inject.

[Mister-Hope]

Here is the declaration file:

import { AnyObject } from '../types/basic';
import { Wrapper } from '../wrappers';
export interface Key<T> extends Symbol {
}
export declare function provide(data: AnyObject): void;
export declare function provide<T>(key: Key<T>, value: T | Wrapper<T>): void;
export declare function inject<T>(key: Key<T>): Wrapper<T> | void;

But the doc says:

provide, inject

▸ provide(key: string | symbol, value: any)

▸ inject(key: string | symbol)

Equivalent with provide and inject from 2.x

So when I use string instead of exporting and importing symbols accross file, I got type error.