src/vs/platform/registry/common/platform.ts/RegistryImpl/add
class RegistryImpl:	public add(id: string, data: any): void {
		Assert.ok(Types.isString(id));
		Assert.ok(Types.isObject(data));
		Assert.ok(!this.data.has(id), 'There is already an extension with this id');

		this.data.set(id, data);
	}